GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Interior Lights Dimming System Check?

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Go to Step 2

Go to Interior Lights Dimming System Check

2

Test CKT 390 (YEL) between the Lamp Control Module (LCM) and S211 for an open or a short to ground. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is CKT 390 OK?

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Go to Step 3

Go to Step 4

3

Replace the LCM. Refer to Lamp Control Module Replacement .

Is the repair complete?

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Go to Interior Lights Dimming System Check

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4

Repair the open or short to ground in CKT 390 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lights Dimming System Check

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