Heated Seats - Electrical Diagnostics

DIAGNOSTIC CODE INDEX

DTC                                                              Description
B1092                          FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW
B1094                         FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN
B1096                        FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW
B1098                       FRONT RIGHT SEAT HEATER CONTROL CIRCUIT OPEN
B10BB                LEFT HEATED SEAT SWITCH INPUT CIRCUIT STUCK - CLUSTER
B10BC               RIGHT HEATED SEAT SWITCH INPUT CIRCUIT STUCK - CLUSTER
B2181                               HEATED SEAT MODULE POWER SUPPLY LOW
B2182                              HEATED SEAT MODULE POWER SUPPLY HIGH

HEATED SEATS - ELECTRICAL DIAGNOSTICS

B1092-FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW📷 4

⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Ignition on, during the heated seat operation.

Set conditions

 Set Condition:

This code is set immediately after the Heated Seat Module detects the control circuit shorted to ground.

Possible causes

(P187) LEFT SEAT HEATER B(+) DRIVER SHORTED TO GROUND
SEAT CUSHION HEATER ELEMENT SHORTED
SEAT BACK HEATER ELEMENT SHORTED
HEATED SEAT MODULE

Diagnostic test

VERIFY THAT DTC B1092-FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW IS

ACTIVE With the scan tool, record and erase CCN DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1092 - FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW reset?

Yes Go To 2.

No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

DISCONNECT LEFT CUSHION HEATER 2-WAY CONNECTOR AND READ DTC'S

Disconnect the Left Seat Cushion Heater 2- way connector.

NOTE

Check connectors - Clean and repair as necessary.

With the scan tool, erase DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the scan tool display the same DTC?

Yes Go To 5.

No Go To 3.

CHECK THE (P187) LEFT SEAT HEATER B(+) DRIVER FOR A SHORT TO GROUND AT

THE SEAT Connector (Component Side) And Seat Frame For Short To Ground Measure between the (P187) Left Seat Heater B(+) Driver circuit at the Left Seat Heater connector (component side) and the seat frame for a short to ground. Is the resistance below 1000 ohms?

No Go To 4.

Yes Repair/replace the pigtail/heating element as necessary for a short to ground condition. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE LEFT HEATER ELEMENT SEAT CUSHION AND SEAT BACK RESISTANCE

Cushion And Seat Back Heater Connectors Gain access to the seat cushion and seat back heater connectors. Check the resistance of each of the heater elements by measuring between the (P187) Left Seat Heater B (+) Driver and the Ground circuit at the seat cushion and seat back heater connectors. For the seat cushion element the resistance value is 3 to 5.5 ohms. For the seat back element the resistance value is 4 to 6 ohms. Is the resistance correct for each heater element?

Yes Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent short to ground.

No Replace the heater element as necessary. Perform BODY VERIFICATION TEST - VER 1 .

Check the (P187) Left Seat Heater B(+) Driver circuit for a short to ground

Ensure the Left Seat Cushion Heater 2- way connector is still disconnected. Disconnect the Heated Seat Module connector.

NOTE

Check connectors - Clean and repair as necessary.

Measure the (P187) Left Seat Heater B(+) Driver circuit cavity D at the HSM connector to ground. Is the resistance below 5.0 ohms?

Yes Repair the (P187) Left Seat Heater B(+) Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1 .

No Replace the Heated Seat Module. Perform BODY VERIFICATION TEST - VER 1 .

B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN📷 6

⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Ignition on, during the heated seat operation.

Set conditions

 Set Condition:

This code is set immediately after the Heated Seat Module detects an open in the seat heater B(+) driver circuit.

Possible causes

(P187) LEFT SEAT HEATER B(+) DRIVER WIRE OPEN
(Z914) GROUND WIRE OPEN
SEAT CUSHION HEATER ELEMENT OPEN
SEAT BACK HEATER ELEMENT OPEN
HEATED SEAT MODULE

Diagnostic test

VERIFY THAT DTC B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN IS

ACTIVE With the scan tool, record and erase CCN DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1094 FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN reset?

Yes Go To 2.

No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

CHECK FOR AN OPEN SEAT HEATER ELEMENT CIRCUIT

Cushion 2- Way Connector (Component Side) Disconnect the Left Seat Cushion Heater 2- way connector.

NOTE

Check connectors - Clean and repair as necessary.

Measure the total resistance of the cushion and seat back heater elements at the Left Seat Cushion 2- way connector (component side). Is the total resistance 2.5 to 3.5 ohms + or -.5 ohms?

Yes Go To 4.

No Go To 3.

CHECK THE LEFT SEAT HEATER ELEMENT RESISTANCE

Cushion And Seat Back Heater Connectors Gain access to and disconnect the seat cushion and seat back heater connectors.

NOTE

Check connectors - Clean and repair as necessary.

Measure each of the heater elements by measuring between the (P187) Left Seat Heater B(+) Driver and the Ground circuit at the seat cushion and seat back heater connectors. For the seat cushion element the resistance value is 3 to 5.5 ohms. For the seat back element the resistance value is 4 to 6 ohms. Is the resistance correct for each heater element?

Yes Check for an open in the pigtail harness and repair as necessary. Perform BODY VERIFICATION TEST - VER 1 .

No Replace the heater element as necessary. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE LEFT SEAT HEATER GROUND CIRCUIT

Seat Cushion Heater 2- Way Connector (Harness Side) Using a 12-volt test light connected to 12-volts, check the (Z914) Ground circuit at the Left Seat Cushion Heater 2- way connector (harness side). Does the test light illuminate brightly?

Yes Go To 5.

No Repair the (Z914) Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE (P187) LEFT SEAT HEATER B(+) DRIVER CIRCUIT FOR AN OPEN

Left Seat Cushion Heater 2- Way Connector (Harness Side) Disconnect the Heated Seat Module connector.

NOTE

Check connectors - Clean and repair as necessary.

Measure the (P187) Left Seat Heater B(+) Driver circuit cavity D from the HSM connector to the Left Seat Cushion Heater 2- way connector (harness side). Is the resistance below 5.0 ohms?

Yes Replace the Heated Seat Module. Perform BODY VERIFICATION TEST - VER 1 .

No Repair the (P187) Left Seat Heater B(+) Driver circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .

B1096-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW📷 4

⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Ignition on, during the heated seat operation.

Set conditions

 Set Condition:

This code is set immediately after the Heated Seat Module detects the control circuit shorted to ground.

Possible causes

(P188) RIGHT SEAT HEATER B(+) DRIVER SHORTED TO GROUND
SEAT CUSHION HEATER ELEMENT SHORTED
SEAT BACK HEATER ELEMENT SHORTED
HEATED SEAT MODULE

Diagnostic test

VERIFY THAT DTC B1096-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW IS

ACTIVE With the scan tool, record and erase CCN DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1096 - FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW reset?

Yes Go To 2.

No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

DISCONNECT RIGHT CUSHION HEATER 2-WAY CONNECTOR AND READ DTC'S

Disconnect the Left Seat Cushion Heater 2- way connector.

NOTE

Check connectors - Clean and repair as necessary.

With the scan tool, erase DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the scan tool display the same DTC?

Yes Go To 5.

No Go To 3.

CHECK THE (P188) RIGHT SEAT HEATER B(+) DRIVER FOR A SHORT TO GROUND AT

THE SEAT Connector (Component Side) And Seat Frame For Short To Ground Measure between the (P188) Right Seat Heater B(+) Driver circuit at the Right Seat Heater connector (component side) and the seat frame for a short to ground. Is the resistance below 1000 ohms?

No Go To 4.

Yes Repair/replace the pigtail/heating element as necessary for a short to ground condition. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE RIGHT HEATER ELEMENT SEAT CUSHION AND SEAT BACK RESISTANCE

Cushion And Seat Back Heater Connectors Gain access to the seat cushion and seat back heater connectors. Check the resistance of each of the heater elements by measuring between the (P188) Right Seat Heater B (+) Driver and the Ground circuit at the seat cushion and seat back heater connectors. For the seat cushion element the resistance value is 3 to 5.5 ohms. For the seat back element the resistance value is 4 to 6 ohms. Is the resistance correct for each heater element?

Yes Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent short to ground.

No Replace the heater element as necessary. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE (P188) RIGHT SEAT HEATER B(+) DRIVER CIRCUIT FOR A SHORT TO

GROUND Ensure the Right Seat Cushion Heater 2 - way connector is still disconnected. Disconnect the Heated Seat Module connector.

NOTE

Check connectors - Clean and repair as necessary.

Measure the (P188) Right Seat Heater B(+) Driver circuit cavity K at the HSM connector to ground. Is the resistance below 5.0 ohms?

Yes Repair the (P188) Right Seat Heater B(+) Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1 .

No Replace the Heated Seat Module. Perform BODY VERIFICATION TEST - VER 1 .

B1098-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT OPEN📷 7

⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Ignition on, during the heated seat operation.

Set conditions

 Set Condition:

This code is set immediately after the Heated Seat Module detects an open in the seat heater B(+) driver circuit.

Possible causes

(P188) RIGHT SEAT HEATER B(+) DRIVER WIRE OPEN
(Z914) GROUND WIRE OPEN
SEAT CUSHION HEATER ELEMENT OPEN
SEAT BACK HEATER ELEMENT OPEN
HEATED SEAT MODULE

Diagnostic test

VERIFY THAT DTC B1098-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT OPEN IS

ACTIVE With the scan tool, record and erase CCN DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1098 FRONT RIGHT SEAT HEATER CONTROL CIRCUIT OPEN reset?

Yes Go To 2.

No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

CHECK FOR AN OPEN SEAT HEATER ELEMENT

Cushion 2 - Way Connector (Component Side) Disconnect the Right Seat Cushion Heater 2 - way connector.

NOTE

Check connectors - Clean and repair as necessary.

Measure the total resistance of the cushion and seat back heater elements at the Right Seat Cushion 2 - way connector (component side). Is the total resistance 2.5 to 3.5 ohms + or -.5 ohms?

Yes Go To 4.

No Go To 3.

CHECK THE RIGHT SEAT HEATER ELEMENT RESISTANCE

Cushion And Seat Back Heater Connectors Gain access to and disconnect the seat cushion and seat back heater connectors.

NOTE

Check connectors - Clean and repair as necessary.

Measure each of the heater elements by measuring between the (P188) Right Seat Heater B(+) Driver and the Ground circuit at the seat cushion and seat back heater connectors. For the seat cushion element the resistance value is 3 to 5.5 ohms. For the seat back element the resistance value is 4 to 6 ohms. Is the resistance correct for each heater element?

Yes Check for an open in the pigtail harness and repair as necessary. Perform BODY VERIFICATION TEST - VER 1 .

No Replace the heater element as necessary. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE SEAT HEATER GROUND CIRCUIT

Seat Cushion Heater 2 - Way Connector (Harness Side) Using a 12-volt test light connected to 12-volts, check the (Z914) Ground circuit at the Right Seat Cushion Heater 2 - way connector (harness side). Does the test light illuminate brightly?

Yes Go To 5.

No Repair the (Z914) Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .

CHECK THE (P188) RIGHT SEAT HEATER B(+) DRIVER CIRCUIT FOR AN OPEN.

To Right Seat Cushion Heater 2 - Way Connector (Harness Side) Disconnect the Heated Seat Module connector.

NOTE

Check connectors - Clean and repair as necessary.

Measure the (P188) Right Seat Heater B(+) Driver circuit cavity K from the HSM connector to the Right Seat Cushion Heater 2 - way connector (harness side). Is the resistance below 5.0 ohms?

Yes Replace the Heated Seat Module. Perform BODY VERIFICATION TEST - VER 1 .

No Repair the (P188) Right Seat Heater B(+) Driver circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .

B10BB-LEFT HEATED SEAT SWITCH INPUT CIRCUIT STUCK - CLUSTER

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Continuously

Set conditions

 Set Condition:

When the Heated Seat Switch in the Switch Bank is held in the on position for over 10 seconds, this code will set.

Possible causes

(D506) LIN BUS CIRCUIT PARTIAL SHORT TO GROUND
SWITCH BANK STUCK
INSTRUMENT CLUSTER

1. TEST FOR INTERMITTENT CONDITION📷 3

Turn the ignition on.

With the scan tool, record and erase CCN DTC's

Operate the Heated Seat Switch several times.

Cycle the ignition from on to off.

Turn the ignition on.

With the scan tool, read DTC's.

Does the scan tool display B10BB LEFT HEATED SEAT SWITCH INPUT CIRCUIT STUCK?

Yes

Go To 2.

The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

2. SWITCH SHORTED

With the scan tool, erase DTC's.

Disconnect the Switch Bank connector.

With the scan tool, read DTC's.

Does the scan tool display B10BB - LEFT HEATED SEAT SWITCH INPUT CIRCUIT STUCK?

Replace the Switch Bank. Perform BODY VERIFICATION TEST - VER 1 .

Yes

Go To 3. 3. (D506) LIN BUS CIRCUIT PARTIAL SHORT TO GROUND

Turn the ignition off.

Disconnect the Cluster C2 connector.

Measure the resistance between ground and the (D506) LIN Bus circuit.

Is the resistance below 10000.0 ohms?

Yes

Repair the (D506) LIN Bus circuit for a partial short to ground. Perform BODY VERIFICATION TEST - VER 1 .

Replace the Instrument Cluster in accordance with service information. Perform BODY VERIFICATION TEST - VER 1 .

B10BC-RIGHT HEATED SEAT SWITCH INPUT CIRCUIT STUCK - CLUSTER

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

Continuously

Set conditions

 Set Condition:

When the Heated Seat Switch in the Switch Bank is held in the on position for over 10 seconds, this code will set.

Possible causes

(D506) LIN BUS CIRCUIT PARTIAL SHORT TO GROUND
SWITCH BANK STUCK
INSTRUMENT CLUSTER

1. TEST FOR INTERMITTENT CONDITION📷 2

Turn the ignition on.

With the scan tool, record and erase CCN DTC's

Operate the Heated Seat Switch several times.

Cycle the ignition from on to off.

Turn the ignition on.

With the scan tool, read DTC's.

Does the scan tool display B10BC RIGHT HEATED SEAT SWITCH INPUT CIRCUIT STUCK?

Yes

Go To 2.

The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

2. SWITCH SHORTED

With the scan tool, erase DTC's.

Disconnect the Switch Bank connector.

With the scan tool, read DTC's.

Does the scan tool display B10BC - RIGHT HEATED SEAT SWITCH INPUT CIRCUIT STUCK?

Replace the Switch Bank. Perform BODY VERIFICATION TEST - VER 1 .

Yes

Go To 3. 3. (D506) LIN BUS CIRCUIT PARTIAL SHORT TO GROUND

Turn the ignition off.

Disconnect the Cluster C2 connector.

Measure the resistance between ground and the (D506) LIN Bus circuit.

Is the resistance below 10000.0 ohms?

Yes

Repair the (D506) LIN Bus circuit for a partial short to ground. Perform BODY VERIFICATION TEST - VER 1 .

Replace the Instrument Cluster in accordance with service information. Perform BODY VERIFICATION TEST - VER 1 .

B2181-HEATED SEAT MODULE POWER SUPPLY LOW📷 2

⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

During heated seat operation.

Set conditions

 Set Condition:

This code is set immediately if the Heated Seat Module detects voltage under 10 volts on the (P693) Heated Seat Module Supply circuit.

Possible causes

(P693) HEATED SEAT MODULE SUPPLY CIRCUIT HIGH RESISTANCE
HEATED SEAT MODULE

Diagnostic test

CHECK PCM FOR CHARGING SYSTEM DTC

With the scan tool, read Powertrain Control Module DTC's. Are there any Charging System DTC's set in the Powertrain Control Module?

Yes (Refer to DIAGNOSIS AND TESTING ) for Charging System diagnostic procedures.

No Go To 2. Perform BODY VERIFICATION TEST - VER 1 .

VERIFY THAT DTC B2181 - HEATED SEAT MODULE POWER SUPPLY LOW IS ACTIVE

With the scan tool, record and erase DTC's Turn the ignition switch to the Off position then start the engine and operate the heated seats for one minute. With the scan tool, read DTC's. Does the DTC B2181 - HEATED SEAT MODULE POWER SUPPLY LOW reset?

Yes Go To 3.

No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 .

(P693) HEATED SEAT MODULE SUPPLY CIRCUIT HIGH RESISTANCE

Supply Circuit At HSM Connector Disconnect the Heated Seat Module connector.

NOTE

Check connectors - Clean and repair as necessary.

Start the engine and let idle. Using a 12-volt test light connected to ground, check the (P693) Heated Seat Module Supply circuit at the HSM connector.

NOTE

The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes Replace the Heated Seat Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .

No Repair the (P693) Heated Seat Module Supply circuit as necessary. Perform BODY VERIFICATION TEST - VER 1 .

B2182-HEATED SEAT MODULE POWER SUPPLY HIGH

⚡ Wiring diagram: Heated Seats Circuit

Additional wiring

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS .

When monitored

During heated seat operation.

Set conditions

 Set Condition:

This code is set immediately if the Heated Seat Module detects voltage over 16.0 volts on the (F937) Fused Ignition Switch Output (Run) circuit.

Possible causes

TROUBLE CODE PRESENT
CHARGING SYSTEM HIGH

Diagnostic test

CHECK PCM FOR CHARGING SYSTEM DTC

With the scan tool, record and erase DTC's. Cycle the ignition switch from On to Off. Start the engine. Run the engine at approximately 1500 RPM for 1 minute. With the scan tool, read DTCs. With the scan tool, read Powertrain Control Module DTC's. Are there any Charging System DTC's set in the Powertrain Control Module?

Yes (Refer to DIAGNOSIS AND TESTING ) for Charging System diagnostic procedures. Perform BODY VERIFICATION TEST - VER 1 .

No The conditions that caused this code to set are not present at this time. Using Service Information, check the charging system. Perform BODY VERIFICATION TEST - VER 1 .