Schematic Reference: Body Rear End Schematics

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Open the trunk.
4. With a scan tool, observe the Trunk Ajar Switch parameter in the body control module (BCM) data list.

Does the scan tool display On?

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

Go to Step 3

1. Turn OFF the ignition.
2. Disconnect the trunk ajar switch.
3. Connect a fused jumper wire between the control circuit of the trunk ajar switch and a good ground.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, observe the trunk ajar switch parameter.

Does the scan tool display On?

Go to Step 5

Go to Step 4

Test the signal circuit of the trunk ajar switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 7

Test the ground circuit of the trunk ajar switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

Inspect for poor connections at the harness connector of the trunk ajar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

Replace the trunk ajar switch.

Did you complete the replacement?

Go to Step 10

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Important: When replacing the BCM refer to Control Module References in Computer/Integrating Systems.

Replace the BCM. Refer to Control Module References in Computer/Integrating Systems .

Did you complete the replacement?

Go to Step 10

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2