GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Interior Lamp System Check performed?

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Go to Step 2

Go to Interior Lamps System Check

2

  1. Disconnect the LH door lock cylinder switch connector C502.
  2. Connect a fused jumper between the LH door lock cylinder switch connector C502 terminal B (LT GRN) and terminal A (BLK/WHT).

Do the courtesy lamps light?

--

Go to Step 3

Go to Step 4

3

Replace the LH door lock cylinder switch. Refer to Door Lock Cylinder Replacement in Doors.

Is the door lock cylinder switch replacement complete?

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Go to Interior Lamps System Check

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4

Connect a fused jumper from the LH door lock cylinder switch connector C502 terminal B (LT GRN) to ground.

Do the courtesy lamps light?

--

Go to Step 5

Go to Step 6

5

Repair the open in CKT 51 (BLK/WHT) between S201 and C502. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

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6

Inspect CKT 262 (LT GRN) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 262 OK?

--

Go to Step 7

Go to Step 8

7

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

Is the body control module replacement complete?

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Go to Interior Lamps System Check

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8

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

Is the repair complete?

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Go to Interior Lamps System Check

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