GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Interior Lights System Check performed?

--

Go to Step 2

Go to Interior Lamps System Check

2

  1. Disconnect the headlamp switch connector.
  2. Connect a fused jumper from the headlamp switch connector cavity S (DK BLU) (Oldsmobile) or cavity M (DK BLU) (Pontiac) to cavity N (BLK).

Do all of the courtesy lamps turn on?

--

Go to Step 3

Go to Step 4

3

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the headlamp switch replacement complete?

--

Go to Interior Lamps System Check

--

4

Inspect CKT 1393 (DK BLU) for an open. Refer to Testing for Continuity in Wiring Systems.

Was an open found?

--

Go to Step 5

Go to Step 6

5

Repair the open in CKT 1393 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Interior Lamps System Check

--

6

Inspect CKT 1250 (BLK) for an open. Refer to Testing for Continuity in Wiring Systems.

Was an open found?

--

Go to Step 7

Go to Step 8

7

Repair the open in CKT 1250 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Interior Lamps System Check

--

8

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

Is the MALL module replacement complete?

--

Go to Interior Lamps System Check

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