GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Body Rear End Schematics

1

Did you review the Body Rear End description and operation and perform the necessary inspections?

Go to Step 2

Go to Luggage Compartment Description and Operation

2

Open the rear compartment.

Does the trunk ajar indicator illuminate?

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

Go to Step 3

3

  1. Disconnect the rear compartment courtesy lamp.
  2. Connect a fused jumper between the signal circuit of the rear compartment courtesy lamp and a good ground.

Does the trunk ajar indicator illuminate?

Go to Step 4

Go to Step 6

4

Connect a fused jumper between the signal circuit of the rear compartment courtesy lamp and the ground circuit of the rear compartment courtesy lamp?

Does the trunk ajar indicator illuminate?

Go to Step 8

Go to Step 5

5

  1. Connect the rear compartment courtesy lamp.
  2. Disconnect the rear compartment courtesy lamp switch.
  3. Connect a fused jumper between the signal circuit of the rear compartment courtesy lamp switch and a good ground.

Does the trunk ajar indicator illuminate?

Go to Step 7

Go to Step 9

6

Test the signal circuit of the rear compartment courtesy lamp for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 12

7

Inspect for poor connections at the harness connector of the rear compartment courtesy lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 10

8

Inspect for poor connections at the harness connector of the rear compartment courtesy lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 11

9

Repair the open or high resistance in the signal circuit of the rear compartment courtesy lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

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10

Replace the rear compartment courtesy lamp assembly.

Did you complete the replacement?

Go to Step 13

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11

Replace the rear compartment courtesy lamp switch.

Did you complete the replacement?

Go to Step 13

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12

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3