The driver door module (DDM) and passenger door module (PDM) each provide motor control output functions for their respective mirrors. These output controls allow each door module to command their respective power mirrors in horizontal and vertical positions. The driver door switch assembly (DDSA) sends a serial data message to the door modules when the mirror switch is activated to the up, down, left or right positions. When the door modules detect an active mirror command from the DDSA, they will command the respective mirror motor in the appropriate direction. Each door module commands their respective mirror motors by applying a ground or voltage to the control circuit, depending on the desired mirror position.

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Driver and Passenger.

⇒	If the parameter does not cycle between the specified values, replace the DDSA.

2. Observe the scan tool Mirror Motors Command parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, Left, and Right.

⇒	If the parameter does not cycle between the specified values, replace the DDSA.

3. Using the mirror directional switch operate the left and right outside mirrors to move up, down, left and right. The mirrors should move in the commanded directions.

⇒	If a mirror does not move in all the commanded directions refer to, Mirror Motor Circuit Test.

4. Operate the memory 1 and 2 recall switches. The outside rearview mirrors should adjust to the stored memory settings.

⇒	If a mirror does not adjust to the stored memory setting refer to, Mirror Position Sensor Circuit Test.

Mirror Motor Circuit Test

1. Ignition OFF, disconnect the X4 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:

•	Control circuit terminal 1

•	Control circuit terminal 2

•	Control circuit terminal 5

⇒	If the test lamp illuminates, test the appropriate control circuit for a short to voltage.

3. Ignition OFF, test for infinite resistance between the following control circuits and ground:

•	Control circuit terminal 1

•	Control circuit terminal 2

•	Control circuit terminal 5

4. Test for 20-120 ohms between the control circuit terminal 1 and the control circuit terminal 2.

⇒	If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.

5. Test for 20-120 ohms between the control circuit terminal 5 and the control circuit terminal 2.

⇒	If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.

6. If all circuits test normal, replace the appropriate door module.

Mirror Position Sensor Circuit Test

1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:

•	5-volt reference circuit terminal 7

•	Signal circuit terminal 2

•	Signal circuit terminal 3

•	Low reference circuit terminal 6

⇒	If the test lamp illuminates, test the appropriate circuit for a short to voltage.

3. Ignition OFF, test for infinite resistance between the following circuits and ground:

•	5-volt reference circuit terminal 7

•	Signal circuit terminal 2

•	Signal circuit terminal 3

•	Low reference circuit terminal 6

⇒	If less than the specified value, test the appropriate circuit for a short to ground.

4. Test for 4K-7K ohms between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 6.

⇒	If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.

5. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 2.

⇒	If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.

6. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 3.

⇒	If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.

7. If all circuits test normal, replace the door module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.