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Factory FSM · 33 topics
DIAGNOSTIC CODE INDEX
DTC                                                                 Description
B143B                                              MICROPHONE 1 CIRCUIT LOW
B143B                                      MICROPHONE 1 CIRCUIT LOW (RADIO)
B143C                                             MICROPHONE 1 CIRCUIT HIGH
B143C                                     MICROPHONE 1 CIRCUIT HIGH (RADIO)
B143E                                              MICROPHONE 2 CIRCUIT LOW
B143E                                      MICROPHONE 2 CIRCUIT LOW (RADIO)
B143F                                             MICROPHONE 2 CIRCUIT HIGH
B143F                                     MICROPHONE 2 CIRCUIT HIGH (RADIO)
B1459                               TELEMATICS MIRROR CONTROL CIRCUIT LOW
B145A                              TELEMATICS MIRROR CONTROL CIRCUIT HIGH
B145B                              TELEMATICS MIRROR CONTROL CIRCUIT OPEN
B2205                                        ORIGINAL VIN MISSING/MISMATCH
B2223                                      (HFM) HANDS FREE PHONE INTERNAL
B222A                                                 VEHICLE LINE MISMATCH
B222E                                         FLASH CHECKSUM PERFORMANCE
B2230                                               RAM WRITE PERFORMANCE
U0019                                                              CAN B BUS
U0141                     LOST COMMUNICATION WITH FRONT CONTROL MODULE
U0151           LOST COMMUNICATION WITH OCCUPANT RESTRAINT CONTROLLER
U0154           LOST COMMUNICATION WITH OCCUPANT CLASSIFICATION MODULE
U0155                                LOST COMMUNICATION WITH CLUSTER/CCN
U0156                                         LOST COMMUNICATION WITH EOM
U0164                      LOST COMMUNICATION WITH HVAC CONTROL MODULE
U0168         LOST COMMUNICATION WITH VEHICLE SECURITY CONTROL MODULE
(SKREEM/WCM)
U0184                                       LOST COMMUNICATION WITH RADIO
U0186                            LOST COMMUNICATION WITH AUDIO AMPLIFIER
U0195                                       LOST COMMUNICATION WITH SDARS
U0196            LOST COMMUNICATION WITH VEHICLE ENTERTAINMENT CONTROL
MODULE
U0199                        LOST COMMUNICATION WITH DRIVER DOOR MODULE
U0200                    LOST COMMUNICATION WITH PASSENGER DOOR MODULE
U0208               LOST COMMUNICATION WITH HEATED SEAT CONTROL MODULE
U0209              LOST COMMUNICATION WITH MEMORY SEAT CONTROL MODULE
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
B143B-MICROPHONE 1 CIRCUIT LOW📷 2
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Inside Rearview Mirror C2 harness connector. Turn the ignition on. With the scan tool, read the DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Inside Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off. Disconnect the Hands Free Module harness connector. Measure the resistance between ground and the (X712) Microphone 1 circuit. Is the resistance below 10K ohms?
Yes Repair the (X712) Microphone 1 circuit for short to ground. Perform BODY VERIFICATION TEST - VER 1 .
No Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B143B-MICROPHONE 1 CIRCUIT LOW (RADIO)📷 2
⚡ Wiring diagram: Radio Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Inside Rearview Mirror C2 harness connector. Turn the ignition on. With the scan tool, read the DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Inside Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X712) MICROPHONE 1 IN (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off. Disconnect the Hands Free Module harness connector. Measure the resistance between ground and the (X712) Microphone 1 circuit. Is the resistance below 10K ohms?
Yes Repair the (X712) Microphone 1 circuit for short to ground. Perform BODY VERIFICATION TEST - VER 1 .
No Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B143C-MICROPHONE 1 CIRCUIT HIGH📷 3
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X712) MICROPHONE 1 IN (+) CIRCUIT OPEN
  • (X712) MICROPHONE 1 IN (+) CIRCUITS SHORTED TO VOLTAGE
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Rearview Mirror harness connector. Turn the ignition on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X712) MICROPHONE CIRCUITS SHORTED TO VOLTAGE
Turn the ignition off. Disconnect the Hands Free Module harness connector. Turn the ignition on. Measure the voltage of the (X712) Microphone circuit. Is the voltage above 1.0 volt?
Yes Repair the (X712) Microphone circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1 .
No Go To 4.
4
(X712) MICROPHONE 1 IN (+) CIRCUIT OPEN
Inside Rearview Mirror Connector Turn the ignition off. Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the HFM connector and the inside rearview mirror connector. Is the resistance below 5.0 ohms?
Yes Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair the (X712) Microphone 1 IN (+) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
figure
B143C-MICROPHONE 1 CIRCUIT HIGH (RADIO)📷 2
⚡ Wiring diagram: Radio Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X712) MICROPHONE 1 IN (+) CIRCUIT OPEN
  • (X712) MICROPHONE 1 IN (+) CIRCUITS SHORTED TO VOLTAGE
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Rearview Mirror harness connector. Turn the ignition on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X712) MICROPHONE CIRCUITS SHORTED TO VOLTAGE
Turn the ignition off. Disconnect the Hands Free Module harness connector. Turn the ignition on. Measure the voltage of the (X712) Microphone circuit. Is the voltage above 1.0 volt?
Yes Repair the (X712) Microphone circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1 .
No Go To 4.
4
(X712) MICROPHONE 1 IN (+) CIRCUIT OPEN
Turn the ignition off. Measure the resistance of the (X712) Microphone 1 IN (+) circuit between the HFM connector and the inside rearview mirror connector. Is the resistance below 5.0 ohms?
Yes Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair the (X712) Microphone 1 IN (+) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B143E-MICROPHONE 2 CIRCUIT LOW📷 2
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X722) MICROPHONE 2 IN (+) CIRCUIT SHORTED TO GROUND
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Inside Rearview Mirror harness connector. Turn the ignition on. With the scan tool, read the DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Inside Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X722) MICROPHONE 2 IN (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off. Disconnect the Hands Free Module harness connector. Measure the resistance between ground and the (X722) Microphone 2 circuit. Is the resistance below 10K ohms?
Yes Repair the (X722) Microphone 2 circuit for short to ground. Perform BODY VERIFICATION TEST - VER 1 .
No Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B143E-MICROPHONE 2 CIRCUIT LOW (RADIO)📷 2
⚡ Wiring diagram: Radio Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X722) MICROPHONE 2 IN (+) CIRCUIT SHORTED TO GROUND
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Inside Rearview Mirror harness connector. Turn the ignition on. With the scan tool, read the DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Inside Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X722) MICROPHONE 2 IN (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off. Disconnect the Hands Free Module harness connector. Measure the resistance between ground and the (X722) Microphone 2 circuit. Is the resistance below 10K ohms?
Yes Repair the (X722) Microphone 2 circuit for short to ground. Perform BODY VERIFICATION TEST - VER 1 .
No Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B143F-MICROPHONE 2 CIRCUIT HIGH📷 3
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X722) MICROPHONE 2 IN (+) CIRCUIT OPEN
  • (X722) MICROPHONE 2 IN (+) CIRCUITS SHORTED TO VOLTAGE
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Rearview Mirror harness connector. Turn the ignition on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X722) MICROPHONE CIRCUITS SHORTED TO VOLTAGE
Turn the ignition off. Disconnect the Hands Free Module harness connector. Turn the ignition on. Measure the voltage of the (X722) Microphone circuit. Is the voltage above 1.0 volt?
Yes Repair the (X722) Microphone circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1 .
No Go To 4.
4
(X722) MICROPHONE 2 IN (+) CIRCUIT OPEN
And Inside Rearview Mirror Connector Turn the ignition off. Measure the resistance of the (X722) Microphone 2 IN (+) circuit between the HFM connector and the inside rearview mirror connector. Is the resistance below 5.0 ohms?
Yes Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair the (X722) Microphone 2 IN (+) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
figure
B143F-MICROPHONE 2 CIRCUIT HIGH (RADIO)📷 2
⚡ Wiring diagram: Radio Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault in any of the microphone circuits.

Possible causes

  • (X722) MICROPHONE 2 IN (+) CIRCUIT OPEN
  • (X722) MICROPHONE 2 IN (+) CIRCUITS SHORTED TO VOLTAGE
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
INSIDE REARVIEW MIRROR
Turn the ignition off. Disconnect the Rearview Mirror harness connector. Turn the ignition on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 3.
No Replace the Rearview Mirror in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
3
(X722) MICROPHONE CIRCUITS SHORTED TO VOLTAGE
Turn the ignition off. Disconnect the Hands Free Module harness connector. Turn the ignition on. Measure the voltage of the (X722) Microphone circuit. Is the voltage above 1.0 volt?
Yes Repair the (X722) Microphone circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1 .
No Go To 4.
4
(X722) MICROPHONE 2 IN (+) CIRCUIT OPEN
Turn the ignition off. Measure the resistance of the (X722) Microphone 2 IN (+) circuit between the HFM connector and the inside rearview mirror connector. Is the resistance below 5.0 ohms?
Yes Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair the (X722) Microphone 2 IN (+) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B1459-TELEMATICS MIRROR CONTROL CIRCUIT LOW📷 2
⚡ Wiring diagram: Power Mirrors Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects low voltage on the (X793) Microphone Feed circuit.

Possible causes

  • (X793) MICROPHONE FEED CIRCUIT SHORT TO GROUND
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
(X793) MICROPHONE FEED CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (X793) Microphone Feed circuit Is the resistance below 100.0 ohms?
Yes Repair the (X793) Microphone Feed circuit for short to ground. Perform BODY VERIFICATION TEST - VER 1 .
No Go To 3.
3
INSIDE REARVIEW MIRROR
Replace the Inside Rearview Mirror in accordance with the service information. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair is complete. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B145A-TELEMATICS MIRROR CONTROL CIRCUIT HIGH📷 2
⚡ Wiring diagram: Power Mirrors Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects high voltage on the (X793) Microphone Feed circuit.

Possible causes

  • (X793) MICROPHONE FEED CIRCUIT SHORT TO VOLTAGE
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
(X793) MICROPHONE FEED CIRCUIT SHORT TO VOLTAGE
Turn the ignition on. Measure the voltage of the (X793) Microphone Feed circuit. Is the voltage above 1.0 volt?
Yes Repair the (X793) Microphone Feed circuit for short to voltage. Perform BODY VERIFICATION TEST - VER 1 .
No Go To 3.
3
INSIDE REARVIEW MIRROR
Replace the Inside Rearview Mirror in accordance with the service information. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair is complete. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B145B-TELEMATICS MIRROR CONTROL CIRCUIT OPEN📷 2
⚡ Wiring diagram: Power Mirrors Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects an open on the (X793) Microphone Feed circuit.

Possible causes

  • (X793) MICROPHONE FEED CIRCUIT OPEN
  • INSIDE REARVIEW MIRROR
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
(X793) MICROPHONE FEED CIRCUIT OPEN
Inside Rearview Mirror Connector Turn the ignition off. Disconnect the Hands Free Module harness connector. Disconnect the Inside Rearview Mirror harness connector. Measure the resistance of the (X793) Microphone Feed circuit between the HFM connector and the inside rearview mirror connector. Is the resistance below 5.0 ohms?
Yes Go To 3.
No Repair the (X793) Microphone Feed circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
3
INSIDE REARVIEW MIRROR
Replace the Inside Rearview Mirror in accordance with the service information. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. Attempt to make a phone call with the system. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair is complete. Perform BODY VERIFICATION TEST - VER 1 .
figure
figure
B2205-ORIGINAL VIN MISSING/MISMATCH
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module will receive and monitor the VIN message from the PCM and record the VIN if different from the last VIN.

Possible causes

  • INCORRECT VIN PROGRAMMED IN PCM
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
CHECK VIN IN PCM
With the scan tool compare the VIN that is programmed into the PCM to the VIN on the vehicle. Does the VIN programmed into the PCM match the vehicles VIN?
Yes Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Program the correct VIN in the PCM and retest the HFM system.
B2223-(HFM) HANDS FREE PHONE INTERNAL
⚡ Wiring diagram: Hands Free Module Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault during an internal diagnostic check.

Possible causes

  • HANDS FREE MODULE

Diagnostic test

1
REPLACE THE HANDS FREE MODULE IF DTC IS ACTIVE
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
B222A-VEHICLE LINE MISMATCH
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module will receive and monitor the vehicle line message from the PCM and record the vehicle line if different from the last vehicle line.

Possible causes

  • INCORRECT PCM
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTC
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
CHECK VEHICLE LINE IN PCM
With the scan tool compare the vehicle line that is programmed into the PCM to the vehicle line of the vehicle. Does the vehicle line programmed into the PCM match the vehicle?
Yes Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Replace and program the Powertrain Control Module in accordance with the service information. Ensure the PCM is replaced with the correct vehicle line PCM. Perform BODY VERIFICATION TEST - VER 1 .
B222E-FLASH CHECKSUM PERFORMANCE
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault during an internal diagnostic check.

Possible causes

  • HANDS FREE MODULE

Diagnostic test

1
REPLACE THE HANDS FREE MODULE IF DTC IS ACTIVE
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness
connectors. Look for broken, bent, pushed out, or corroded terminals.
B2230-RAM WRITE PERFORMANCE
⚡ Wiring diagram: Body Control Modules Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

With the ignition on.

Set conditions

 Set Condition:
The Hands Free Module detects a fault during an internal diagnostic check.

Possible causes

  • HANDS FREE MODULE

Diagnostic test

1
REPLACE THE HANDS FREE MODULE IF DTC IS ACTIVE
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Replace and program the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
U0019-CAN B BUS📷 3
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Continuously

Set conditions

 Set Condition:
Whenever the CAN Interior Bus (+) or (-) circuits are open, shorted to voltage, or shorted to ground.

Possible causes

  • CAN INTERIOR BUS DTC's IN TIPM
  • (D265) CAN INTERIOR BUS (+) CIRCUIT OPEN
  • (D264) CAN INTERIOR BUS (-) CIRCUIT OPEN
  • HANDS FREE MODULE

Diagnostic test

1
CHECK FOR ACTIVE DTCS
With the scan tool, read the active DTC's. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle. With the scan tool, read the active DTC's. Does the scan tool display this DTC as active?
Yes Go To 2.
No If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2
CHECK TIPM DTC's
With the scan tool, read TIPM active DTC's Does the scan tool display any CAN Interior Bus DTCs - ACTIVE?
Yes Perform BODY VERIFICATION TEST - VER 1 .
No Go To 3.
3
(D265) CAN INTERIOR BUS (+) CIRCUIT OPEN
Connector And Hands Free Module Connector Turn the ignition off. Disconnect the Hands Free Module connector. Disconnect the TIPM C7 harness connector. Measure the resistance of the (D265) CAN Interior Bus (+) circuit between the TIPM C7 connector and the Hands Free Module connector. Is the resistance below 2.0 ohms?
Yes Go To 4.
No Repair the (D265) CAN Interior Bus (+) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
4
(D264) CAN INTERIOR BUS (-) CIRCUIT OPEN
Connector And Hands Free Module Connector Measure the resistance of the (D264) CAN Interior Bus (-) circuit between the TIPM C7 harness connector and the Hands Free Module connector. Is the resistance below 2.0 ohms?
Yes Replace the Hands Free Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .
No Repair the (D264) CAN Interior Bus (-) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .
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U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0151-LOST COMMUNICATION WITH OCCUPANT RESTRAINT CONTROLLER
⚡ Wiring diagram: Supplemental Restraints Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0154-LOST COMMUNICATION WITH OCCUPANT CLASSIFICATION MODULE
⚡ Wiring diagram: Supplemental Restraints Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0155-LOST COMMUNICATION WITH CLUSTER/CCN
⚡ Wiring diagram: Instrument Cluster Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0156-LOST COMMUNICATION WITH EOM
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE
⚡ Wiring diagram: Automatic A/C Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0168-LOST COMMUNICATION WITH VEHICLE SECURITY CONTROL MODULE (SKREEM/WCM)
⚡ Wiring diagram: Anti-theft Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0184-LOST COMMUNICATION WITH RADIO
⚡ Wiring diagram: Radio Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0186-LOST COMMUNICATION WITH AUDIO AMPLIFIER
⚡ Wiring diagram: Radio Circuit, Base

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0195-LOST COMMUNICATION WITH SDARS
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0196-LOST COMMUNICATION WITH VEHICLE ENTERTAINMENT CONTROL MODULE
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0199-LOST COMMUNICATION WITH DRIVER DOOR MODULE
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0200-LOST COMMUNICATION WITH PASSENGER DOOR MODULE
⚡ Wiring diagram: Computer Data Lines Circuit (1 of 2)

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0208-LOST COMMUNICATION WITH HEATED SEAT CONTROL MODULE
⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.
U0209-LOST COMMUNICATION WITH MEMORY SEAT CONTROL MODULE
⚡ Wiring diagram: Driver Power Seat Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .
Refer to DIAGNOSIS AND TESTING . for the diagnostic test procedure.