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Heated Mirrors - Electrical Diagnostics

Factory FSM · 3 topics
DIAGNOSTIC CODE INDEX📷 1
DTC                                                                  Description
B1D33, B1D37                     MIRROR HEATER CONTROL CIRCUIT LOW - DDM/PDM
B1D34, B1D38                     MIRROR HEATER CONTROL CIRCUIT HIGH - DDM/PDM
HEATED MIRRORS - ELECTRICAL DIAGNOSTICS

Diagnosis & testing

B1D33, B1D37-MIRROR HEATER CONTROL CIRCUIT LOW - DDM/PDM

Additional wiring

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

When monitored

Continuously.

Set conditions

NOTE: This test covers both the Driver and Passenger code depending on the side the code appeared in.
 Set Condition:
When the Door Module senses a low value on the mirror heater driver for over 10ms, this code will set.

Possible causes

  • (C16) OR (C17) MIRROR HEATER DRIVER CIRCUIT SHORT TO GROUND
  • MIRROR SHORTED
  • DOOR MODULE
figure
1) TEST FOR INTERMITTENT CONDITION📷 2
Turn the ignition on.
With the scan tool, record and erase DTC's
Turn the rear defogger ON.
Operate the Mirror Switch in all directions several times.
With the scan tool, read DTC's.
Does the scan tool display B1D33, B1D37-MIRROR HEATER CONTROL CIRCUIT LOW?
Yes
Go To 2) TEST FOR A SHORTED MIRROR.
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 .
2) TEST FOR A SHORTED MIRROR
Turn the ignition off.
Disconnect the appropriate door module C2 connector.
Turn the ignition on.
With the scan tool, erase DTC's
Turn the rear defogger ON.
Operate the Mirror Switch in all directions several times.
With the scan tool, read DTC's.
Does the scan tool display B1D33,B1D37-MIRROR HEATER CONTROL CIRCUIT LOW?
Yes
Replace the appropriate Door Module. Perform BODY VERIFICATION TEST - VER 1 .
No
Inspect the mirror harness wires for shorted condition and repair as necessary. If the mirror wiring is OK, replace the Mirror. Perform BODY VERIFICATION TEST - VER 1 .
B1D34, B1D38-MIRROR HEATER CONTROL CIRCUIT HIGH - DDM/PDM

Additional wiring

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

When monitored

Continuously.

Set conditions

 Set Condition:
When the Door Module senses a high value on the mirror heater driver for over 10ms, this code will set.
NOTE: This test covers both the Driver and Passenger code depending on the side the code appeared in.

Possible causes

  • (C16) OR (C17) MIRROR HEATER DRIVER CIRCUIT SHORT TO VOLTAGE
  • MIRROR SHORTED
  • DOOR MODULE
figure
figure
1) TEST FOR INTERMITTENT CONDITION📷 1
Turn the ignition on.
With the scan tool, record and erase DTC's
Turn the rear defogger ON.
Operate the Mirror Switch in all directions several times.
With the scan tool, read DTC's.
Does the scan tool display B1D34, B1D38-MIRROR HEATER CONTROL CIRCUIT HIGH?
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 .
2) TEST FOR A SHORTED MIRROR
Turn the ignition off.
Disconnect the appropriate door module C2 connector.
Turn the ignition on.
With the scan tool, erase DTC's
Turn the rear defogger ON.
Operate the Mirror Switch in all directions several times.
With the scan tool, read DTC's.
Does the scan tool display B1D34,B1D38-MIRROR HEATER CONTROL CIRCUIT HIGH?
Yes
Replace the appropriate Door Module. Perform BODY VERIFICATION TEST - VER 1 .
No
Inspect the mirror harness wires for shorted condition and repair as necessary. If the mirror wiring is OK, replace the Mirror. Perform BODY VERIFICATION TEST - VER 1 .
figure