GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Automatic Day/Night Mirrors System Check performed?

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Go to Step 2

Go to Automatic Day-Night Mirrors System Check

2

  1. Disconnect the automatic day/night mirror connector.
  2. Disconnect the Driver Door Module connector C1.
  3. Connect a DMM from the automatic day/night mirror connector cavity 4 (GRY/BLK) to the Driver Door Module connector C1 cavity 9 (GRY).

Refer to Testing for Continuity in Wiring Systems.

Is the resistance less than the specified value?

5 ohms

Go to Step 3

Go to Step 7

3

Connect a DMM from the automatic day/night mirror connector cavity 5 (PNK) to the Driver Door Module connector C1 cavity 10 (PNK).

Refer to Testing for Continuity in Wiring Systems.

Is the resistance less than the specified value?

5 ohms

Go to Step 4

Go to Step 8

4

  1. Reconnect the Driver Door Module connector C1.
  2. Disconnect the Driver Door Module connector C4.
  3. Turn the ignition switch to the ON position.
  4. Place the automatic day/night mirror switch in an ON position.
  5. Connect a DMM from the Driver Door Module connector C4 cavity 2 (BRN/BLK) to cavity 3 (BRN).

Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

0-1.2 V

Go to Step 5

Go to Step 6

5

Replace the LH mirror. Refer to Power Mirror Replacement in Doors.

Is the LH mirror replacement complete?

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Go to Automatic Day-Night Mirrors System Check

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6

Replace the Driver Door Module Door Control Module Replacement in Doors.

Is the Driver Door Module replacement complete?

--

Go to Automatic Day-Night Mirrors System Check

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7

Repair the open in CKT 1690 (BRN/BLK) between the automatic day/night mirror and the Driver Door Module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Automatic Day-Night Mirrors System Check

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8

Repair the open in CKT 1691 (BRN) between the automatic day/night mirror and the Driver Door Module. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Automatic Day-Night Mirrors System Check

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