B1D33(DDM), B1D37(PDM) – MIRROR HEATER CONTROL CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

When Monitored:
When the Mirror Heater Driver Output is turned on.
Set Condition:
DTC B1D33 – If the Driver Door Module senses an excessive current draw on the (C110) Driver Mirror Heater Driver circuit within 10 ms of turning on the Mirror Heater Driver Output.
DTC B1D37 – If the Passenger Door Module senses an excessive current draw on the (C16) Passenger Mirror Heater Driver circuit within 10 ms of turning on the Mirror Heater Driver Output.

Possible Causes

FOR THE DRIVER MEMORY MIRROR SYSTEM:

(C110) DRIVER MIRROR HEATER DRIVER CIRCUIT SHORTED TO GROUND

(C110) DRIVER MIRROR HEATER DRIVER CIRCUIT SHORTED TO (Z911) GROUND CIRCUIT

(C110) DRIVER MIRROR HEATER DRIVER CIRCUIT SHORTED TO (P69) DRIVER MIRROR SENSOR GROUND CIRCUIT

(C110) DRIVER MIRROR HEATER DRIVER CIRCUIT SHORTED TO (C910) DRIVER MIRROR HEATER RETURN CIRCUIT

DRIVER OUTSIDE REARVIEW MIRROR SHORTED

DRIVER DOOR MODULE

FOR THE PASSENGER MEMORY MIRROR SYSTEM:

(C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT SHORTED TO GROUND

(C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT SHORTED TO (Z908) GROUND CIRCUIT

(C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT SHORTED TO (P66) PASSENGER MIRROR SENSOR GROUND CIRCUIT

(C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT SHORTED TO (C917) PASSENGER MIRROR HEATER RETURN CIRCUIT

PASSENGER OUTSIDE REARVIEW MIRROR SHORTED

PASSENGER DOOR MODULE

NOTE: This procedure addresses the Driver Memory Mirror system's circuits and components and the Passenger Memory Mirror system's circuits and components. Select only that which applies to the system you are diagnosing.

Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION

Does the scan tool display: B1D33 or B1D37 MIRROR HEATER CONTROL CIRCUIT LOW?

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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

2.TEST FOR A SHORTED OUTSIDE REARVIEW MIRROR

For the Driver Memory Mirror System, proceed as follows:

Press the Rear Window Defogger (EBL) mode switch off.
Turn the ignition off.
Disconnect the Driver Outside Rearview Mirror connector.
Turn the ignition on.
With the scan tool, erase DTCs.
Press the Rear Window Defogger (EBL) mode switch on.
With the scan tool, read DTCs.

For the Passenger Memory Mirror System, proceed as follows:

Press the Rear Window Defogger (EBL) mode switch off.
Turn the ignition off.
Disconnect the Passenger Outside Rearview Mirror connector.
Turn the ignition on.
With the scan tool, erase DTCs.
Press the Rear Window Defogger (EBL) mode switch on.
With the scan tool, read DTCs.

Does the scan tool display: B1D33 or B1D37 MIRROR HEATER CONTROL CIRCUIT LOW?

Yes

Go To 3

Replace the Outside Rearview Mirror in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

3.CHECK THE (C110) DRIVER MIRROR HEATER DRIVER CIRCUIT OR THE (C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO GROUND

For the Driver Memory Mirror System, proceed as follows:

Turn the ignition off.
Disconnect the Driver Door Module C1 connector.
Measure the resistance between ground and the (C110) Driver Mirror Heater Driver circuit in the Driver Door Module C1 connector.

For the Passenger Memory Mirror System, proceed as follows:

Turn the ignition off.
Disconnect the Passenger Door Module C1 connector.
Measure the resistance between ground and the (C16) Passenger Mirror Heater Driver circuit in the Passenger Door Module C1 connector.

Is the resistance below 10000.0 ohms?

Yes, Driver Mirror

Repair the (C110) Driver Mirror Heater Driver circuit for a short to ground.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Yes, Passenger Mirror

Repair the (C16) Passenger Mirror Heater Driver circuit for a short to ground.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 4

4.CHECK THE (C110) DRIVER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO THE (Z911) GROUND CIRCUIT OR THE (C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO THE (Z908) GROUND CIRCUIT

For the Driver Memory Mirror System, proceed as follows:

Measure the resistance between the (C110) Driver Mirror Heater Driver circuit and the (Z911) Ground circuit in the Driver Door Module C1 connector.

For the Passenger Memory Mirror System, proceed as follows:

Measure the resistance between the (C16) Passenger Mirror Heater Driver circuit and the (Z908) Ground circuit in the Passenger Door Module C1 connector.

Is the resistance below 10000.0 ohms?

Yes, Driver Mirror

Repair the (C110) Driver Mirror Heater Driver circuit for a short to the (Z911) Ground circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Yes, Passenger Mirror

Repair the (C16) Passenger Mirror Heater Driver circuit for a short to the (Z908) Ground circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 5

5.CHECK THE (C110) DRIVER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO THE (P69) DRIVER MIRROR SENSOR GROUND CIRCUIT OR THE (C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO THE (P66) PASSENGER MIRROR SENSOR GROUND CIRCUIT

For the Driver Memory Mirror System, proceed as follows:

Measure the resistance between the (C110) Driver Mirror Heater Driver circuit and the (P69) Driver Mirror Sensor Ground circuit in the Driver Outside Rearview Mirror connector.

For the Passenger Memory Mirror System, proceed as follows:

Measure the resistance between the (C16) Passenger Mirror Heater Driver circuit and the (P66) Passenger Mirror Sensor Ground circuit in the Passenger Outside Rearview Mirror connector.

Is the resistance below 10000.0 ohms?

Yes, Driver Mirror

Repair the (C110) Driver Mirror Heater Driver circuit for a short to the (P69) Driver Mirror Sensor Ground circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Yes, Passenger Mirror

Repair the (C16) Passenger Mirror Heater Driver circuit for a short to the (P66) Passenger Mirror Sensor Ground circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 6

6.CHECK THE (C110) DRIVER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO THE (C910) DRIVER MIRROR HEATER RETURN CIRCUIT OR THE (C16) PASSENGER MIRROR HEATER DRIVER CIRCUIT FOR A SHORT TO THE (C917) PASSENGER MIRROR HEATER RETURN CIRCUIT

For the Driver Memory Mirror System, proceed as follows:

Measure the resistance between the (C110) Driver Mirror Heater Driver circuit and the (C910) Driver Mirror Heater Return circuit in the Driver Door Module C1 connector.

For the Passenger Memory Mirror System, proceed as follows:

Measure the resistance between the (C16) Passenger Mirror Heater Driver circuit and the (C917) Passenger Mirror Heater Return circuit in the Passenger Door Module C1 connector.

Is the resistance below 10000.0 ohms?

Yes, Driver Mirror

Repair the (C110) Driver Mirror Heater Driver circuit for a short to the (C910) Driver Mirror Heater Return circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Yes, Passenger Mirror

Repair the (C16) Passenger Mirror Heater Driver circuit for a short to the (C917) Passenger Mirror Heater Return circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

No, Driver Mirror

Replace the Driver Door Module in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

No, Passenger Mirror

Replace the Passenger Door Module in accordance with the Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).