GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Open each door.

Does the exterior courtesy lamp illuminate for each door?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Open the driver door.

Do the interior courtesy lamps operate normally?

Go to Step 4

Go to Courtesy Lamps Inoperative

4

Are both exterior courtesy lamps inoperative?

Go to Step 8

Go to Step 5

5

  1. Disconnect the inoperative exterior courtesy lamp from the corresponding door control module.
  2. Connect a test light between the courtesy lamps supply voltage circuit at the door control module and a good ground.

Does the test light illuminate?

Go to Step 6

Go to Step 7

6

Locate and repair an open, high resistance, or short to ground in the courtesy lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

7

Inspect for poor connections at the harness connector of the door control module . Refer to Testing for Intermittent Conditions and Poor Connections and SIR/SRS Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and SIR/SRS Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

9

Replace the appropriate door control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 12

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10

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 12

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11

Locate and repair an open, high resistance, or short to battery positive voltage in the exterior courtesy lamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2