GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Door Control Module Schematics

Connector End View Reference: Power Door Systems Connector End Views

1

Did you perform the Door Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Door Systems

2

Verify that the power mirrors inoperative fault is present.

Does the power mirrors system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Are both mirrors inoperative, or do both mirrors have an inoperative direction?

Go to Step 4

Go to Step 5

4

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the Mirror Right Switch, Mirror Left Switch, Mirror Down Switch and Mirror Up Switch parameters in the Left Door Control Module data list.
  4. Actuate the mirror switch in the RIGHT, LEFT, DOWN and UP directions.

Does the scan tool display Inactive for any of the parameters?

Go to Step 8

Go to Step 13

5

Is the driver mirror inoperative?

Go to Step 6

Go to Step 7

6

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the Drv Mirror Switch parameter in the Left Door Control Module data list.
  4. Press the LH Mirror select switch on the driver door switch.

Does the scan tool display Inactive?

Go to Step 9

Go to Step 10

7

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the Psgr. Mirror Switch parameter in the Left Door Control Module data list.
  4. Press the RH Mirror select switch on the driver door switch.

Does the scan tool display Inactive?

Go to Step 11

Go to Step 12

8

Test the appropriate mirror switch signal circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 14

9

Test the LH mirror select switch signal circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 14

10

Test the appropriate left mirror motor control circuit(s) for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 15

11

Test the RH mirror select switch signal circuit for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 14

12

Test the appropriate right mirror motor control circuit(s) for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 16

13

Inspect for poor connections at the harness connector of the driver door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 17

14

Inspect for poor connections at the harness connector of the driver door switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 18

15

Inspect for poor connections at the harness connector of the appropriate driver outside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 19

16

Inspect for poor connections at the harness connector of the appropriate passenger outside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 20

17

Replace the appropriate door module. Refer to Door Control Module Replacement .

Did you complete the replacement?

Go to Step 21

--

18

Replace the driver door switch. Refer to Front Door Switch Replacement .

Did you complete the replacement?

Go to Step 21

--

19

Replace the driver outside rearview mirror. Refer to Outside Rearview Mirror Replacement .

Did you complete the replacement?

Go to Step 21

--

20

Replace the passenger outside rearview mirror. Refer to Outside Rearview Mirror Replacement .

Did you complete the replacement?

Go to Step 21

--

21

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2