For 1990-2009 cars

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. Is the trunk ajar indicator illuminated? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 |

1. Install a scan tool.
2. Turn the ignition ON with the engine OFF.
3. With a scan tool observe the cargo lamp parameter in the BCM data list.

Does the scan tool display open?

Go to Step 12

Go to Step 4

4 |

1. Disconnect the deck lid switch.
2. Connect a fused jumper between the deck lid switch signal circuit and a good ground.
3. With a scan tool observe the cargo lamp parameter in the BCM data list.

Does the scan tool display open?

Go to Step 5

Go to Step 6

5 |

1. Connect a fused jumper between the deck lid switch signal circuit and the ground circuit of the deck lid switch.
2. With a scan tool observe the cargo lamp parameter in the BCM data list.

Does the scan tool display open?

Go to Step 8

Go to Step 9

6 | Test the signal circuit of the deck lid switch signal circuit 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 7
7 | Inspect for poor connections at the harness connector of the body control module. 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 deck lid 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 11
9 | Repair the open or high resistance in the ground circuit of the deck lid switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | --
10 | Important: When replacing the body control module refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the body control module. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 13 | --
11 | Replace the deck lid switch. Did you complete the replacement? | Go to Step 13 | --
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 | --
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3