GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Interior Lights System Check?

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Go to Step 2

Go to Interior Lamps System Check

2

Test CKT 650 (BLK) between S303 and S401 for an open. Refer to Testing for Continuity in Wiring Systems.

Is there an open in CKT 650?

--

Go to Step 3

Go to Step 5

3

Test CKT 1732 (ORN) between the rear junction block and S301 for an open. Refer to Testing for Continuity in Wiring Systems.

Is there an open in CKT 1732?

--

Go to Step 4

Go to Step 5

4

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

Is the SBM module replacement complete?

--

Go to Interior Lamps System Check

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5

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

Is the repair complete?

--

Go to Interior Lamps System Check

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