GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The TRUNK AJAR or TONNEAU AJAR messages are always displayed, or do not display.

1

Has the Body Rear End Diagnostic System Check been performed?

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Go to Step 2

Go to Diagnostic System Check - Body Rear End

2

  1. Close the trunk lid or folding top compartment lid.
  2. Turn the ignition switch ON.

Is the TRUNK AJAR or TONNEAU AJAR message displayed on the driver information center?

--

Go to Step 3

Go to Step 6

3

Install a scan tool and display the input data 2 list.

Does the scan tool indicate the Hatch/Trunk Ajar Switch or Folding Top Ajar Switch is open?

--

Go to Step 4

Go to Step 13

4

  1. Disconnect the inoperative ajar switch connector.
  2. Turn the ignition switch ON.

Is the TRUNK AJAR or TONNEAU AJAR message displayed on the driver information center?

--

Go to Step 5

Go to Step 8

5

Test and repair the inoperative ajar switch signal circuit for a short to ground.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 12

6

  1. Install a scan tool and display the input data 2 list.
  2. Open the trunk lid or folding top compartment lid.

Does the scan tool indicate the Hatch/Trunk Ajar Switch or Folding Top Ajar Switch is open?

--

Go to Step 7

Go to Step 13

7

  1. Disconnect the inoperative ajar switch connector.
  2. Connect a fused jumper wire from the inoperative ajar switch connector terminal A to terminal B.
  3. Turn the ignition switch ON.

Is the TRUNK AJAR or TONNEAU AJAR message displayed on the driver information center?

--

Go to Step 8

Go to Step 9

8

Replace the inoperative latch assembly. Refer to one of the following procedures:

Is the repair complete?

--

Go to Step 14

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9

  1. Connect a fused jumper wire from the inoperative ajar switch connector terminal B to ground.
  2. Turn the ignition switch ON.

Is the TRUNK AJAR or TONNEAU AJAR message displayed on the driver information center?

--

Go to Step 10

Go to Step 11

10

Repair the open or high resistance in the inoperative ajar switch ground circuit 150.

Is the repair complete?

--

Go to Step 14

--

11

Test and repair the inoperative ajar switch signal circuit for an open or high resistance.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 12

12

Replace the BCM. Refer to Body Control Module Replacement and Body Control Module (BCM) Programming/RPO Configuration .

Is the repair complete?

--

Go to Step 14

--

13

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Step 14

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14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Diagnostic System Check - Body Rear End