GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Body Rear End Schematics

1

Did you perform the Body Rear End Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Body Rear End

2

Verify the fault is present.

Does the system operate normally?

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

Go to Step 3

3

  1. Connect a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the CARGO DOOR AJAR message ON and OFF.

Does the message turn on and off with each command?

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Go to Step 4

Go to Step  11

4

  1. Ensure the cargo door or liftgate is closed.
  2. With a scan tool, observe the cargo door ajar switch parameter in the BCM data list.

Does the scan tool display switch inactive?

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Go to Step 10

Go to Step 5

5

  1. Gain access to and disconnect the door ajar switch(s)/liftgate and liftglass switchs.
  2. With a scan tool, observe the cargo door ajar switch parameter in the BCM data list.

Does the scan tool display switch inactive?

--

Go to Step 9

Go to Step 6

6

Test the Cargo door jamb switch signal circuit for a short to ground.

Refer to Circuit Testing and Testing for Short to Ground in wiring systems.

Did you find and correct the condition?

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Go to Step  12

Go to Step 7

7

Inspect for poor connections at the cargo door / liftgate, RH and LH, and liftglass ajar switch(s) and cargo door contactor(s).

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  12

Go to Step 8

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 Connector Repairs in wiring systems.

Did you find and correct the condition?

--

Go to Step  12

Go to Step 10

9

Replace the door ajar switch.

Refer to Liftgate Latch Replacement or Door Latch Replacement

Did you complete the replacement?

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Go to Step  12

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10

Replace the BCM.

Refer to Body Control Module Replacement

Did you complete the replacement?

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Go to Step  12

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11

Replace the instrument panel cluster.

Refer to Instrument Cluster Replacement in instrument panel, gauges and console.

Did you complete the replacement?

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Go to Step  12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3