GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Interior Lamps System Check?

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Go to Step 2

Go to Interior Lamps System Check

2

  1. Disconnect the suspect door jamb switch connector.
  2. Connect a fused jumper between the appropriate jamb switch connector cavity and ground:
  3. • Left front door: cavity A (BLK)
    • Right front door (Oldsmobile): cavity D (DK BLU)
    • Right front door (Buick): cavity B (YEL)
    • Rear doors: cavity A (DK BLU)

Do all of the courtesy lamps light?

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Go to Step 3

Go to Step 4

3

Test CKT 151 (BLK/WHT) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 151 OK?

--

Go to Step 5

Go to Step 7

4

Inspect the appropriate circuit for an open or short to voltage:

    • Left front door: CKT 155 (DK BLU)
    • Right front door (Oldsmobile): CKT 49 (DK BLU)
    • Right front door (Buick): CKT 528 (YEL)
    • Rear doors: CKT 49 (DK BLU)

Refer to Testing for Continuity in Wiring Systems.

Is the CKT OK?

--

Go to Step 6

Go to Step 7

5

Replace the suspect door jamb switch. Refer to Door Lock Actuator Replacement or Rear Side Door Lock Actuator Replacement in Doors.

Is the repair complete?

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Go to Interior Lamps System Check

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6

Replace the body control module (MALL). Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

--

Go to Interior Lamps System Check

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7

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

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