Driver Door Module (DDM)

900A-MIRROR HEATER CIRCUIT HIGH





For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The Driver Door Module (DDM) will operate the heated mirrors automatically whenever the ambient air temperature is below approximately 55 degrees.

- When Monitored:
Whenever the module is awake.

- Set Condition:
When the (DDM) does not sense any current flow through the internal driver for the heated mirrors, when the heated mirrors are activated, this code will set.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. With the scan tool, actuate the Heated Mirrors.
4. Wait 30 seconds.
5. With the scan tool, read DTCs.

Does the scan tool display 900A-MIRROR HEATER 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. Verification Tests.

2. LEFT MIRROR HEATER DRIVER CIRCUIT SHORT TO VOLTAGE




1. With the scan tool, stop the Heated Mirrors actuator.
2. Turn the ignition off.
3. Disconnect the Driver Door Module C3 connector
4. Turn the ignition on.
5. Measure the voltage between ground and the Left Mirror Heater Driver circuit in the DDM C3 connector.

Is there any voltage present?

Yes

- Repair the Left Mirror Heater Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Go To 3

3. RIGHT MIRROR HEATER DRIVER CIRCUIT SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the Driver Door Module C1 connector
3. Turn the ignition on.
4. Measure the voltage between ground and the Right Mirror Heater Driver circuit in the DDM C1 connector.

Is there any voltage present?

Yes

- Repair the Right Mirror Heater Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Go To 4

4. LEFT OUTSIDE REARVIEW MIRROR CIRCUIT OPEN




1. Turn the ignition off.
2. Ensure all lights are off.
3. Measure the resistance between the Left Mirror Heater Driver circuit and the Left Mirror Return circuit in the DDM C3 connector.

Is the resistance below 2.0 ohms?

Yes

- Go To 5

No

- Go To 6

5. RIGHT OUTSIDE REARVIEW MIRROR CIRCUIT OPEN




1. Measure the resistance between ground and the Right Mirror Heater Driver circuit in the DDM C1 connector.

Is the resistance below 9.0 ohms?

Yes

- Replace the Driver Door Module.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Go To 8

6. LEFT MIRROR HEATER DRIVER CIRCUIT OPEN




1. Disconnect the Left Outside Rearview Mirror C1 connector.
2. Measure the resistance of the Left Mirror Heater Driver circuit between the DDM C3 connector and the Mirror connector.

Is the resistance below 2.0 ohms?

Yes

- Go To 7

No

- Repair the Left Mirror Heater Driver circuit for an open.
- Perform BODY VERIFICATION TEST. Verification Tests.

7. LEFT MIRROR RETURN CIRCUIT OPEN




1. Measure the resistance of the Left Mirror Return circuit between the DDM C3 connector and the Mirror connector.

Is the resistance below 2.0 ohms?

Yes

- Repair the Left Mirror Return circuit for an open.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Replace the Driver Outside Rearview Mirror.
- Perform BODY VERIFICATION TEST. Verification Tests.

8. RIGHT MIRROR HEATER DRIVER CIRCUIT OPEN




1. Disconnect the Right Outside Rearview Mirror connector.
2. Measure the resistance of the Right Mirror Heater Driver circuit between the DDM C1 connector and the Mirror connector.

Is the resistance below 2.0 ohms?

Yes

- Go To 9

No

- Repair the Right Mirror Heater Driver circuit for an open.
- Perform BODY VERIFICATION TEST. Verification Tests.

9. RIGHT MIRROR RETURN CIRCUIT




1. Measure the resistance of the Right Mirror Return circuit between the Right Outside Rearview Mirror connector and ground.

Is the resistance below 10.0 ohms?

Yes

- Replace the Right Outside Rearview Mirror.
- Perform BODY VERIFICATION TEST. Verification Tests.

No

- Repair the Right Mirror Return circuit for an open.
- Perform BODY VERIFICATION TEST. Verification Tests.