GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Open each of the doors.

Do all of the courtesy lamps illuminate when you open each door?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Are the courtesy lamps inoperative from one door only?

Go to Diagnostic Starting Point - Vehicle Access

Go to Step 4

4

Are all of the courtesy lamps inoperative?

Go to Step 7

Go to Step 5

5

Test for an open or high resistance in the inoperative courtesy lamp voltage supply circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6

Test for an open or a short to battery positive voltage in the courtesy lamp low control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2