GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

Connector End View Reference: Vehicle Access Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify that the door ajar indicator is malfunctioning.

Does the door ajar indicator operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is the door ajar indicator ON all the time?

Go to Step 4

Go to Step 8

4

  1. Install a scan tool.
  2. Close all of the doors.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Driver Door Ajar Sw. and the Passenger Door Ajar Sw. parameters in the body control module (BCM) data list.

Does the scan tool display Door Ajar for either of the parameters?

Go to Step 5

Go to Step 19

5

Is the Driver Door Ajar sw. parameter displaying Door Ajar?

Go to Step 6

Go to Step 7

6

  1. With a scan tool, observe the Driver Door Ajar Sw. parameter in the BCM data list.
  2. Disconnect the driver ajar switch assembly harness connector.

Does the scan tool display Door Closed?

Go to Step 20

Go to Step 15

7

  1. With a scan tool, observe the Passenger Door Ajar Sw. parameter in the BCM data list.
  2. Disconnect each of the passenger ajar switch assembly harness connectors, one at a time.

Does the scan tool display Door Closed when any of the harness connectors is disconnected?

Go to Step 20

Go to Step 16

8

Is the door ajar indicator inoperative from the driver door?

Go to Step 9

Go to Step 12

9

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Disconnect the driver ajar switch assembly harness connector.
  4. Connect a 3-amp fused jumper wire between the left front door ajar switch signal circuit of the driver ajar switch assembly harness connector and a good ground.
  5. With a scan tool, observe the Driver Door Ajar Sw. parameter in the BCM data list.

Does the scan tool display Door Ajar?

Go to Step 10

Go to Step 17

10

Is the door ajar indicator illuminated?

Go to Step 11

Go to Step 19

11

  1. Connect a 3-amp fused jumper wire between the left front door ajar switch signal circuit of the driver ajar switch assembly harness connector and the ground circuit of the driver ajar switch assembly harness connector.
  2. With a scan tool, observe the Driver Door Ajar Sw. parameter in the BCM data list.

Does the scan tool display Door Ajar?

Go to Step 20

Go to Step 22

12

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Disconnect the appropriate passenger ajar switch assembly harness connector.
  4. Connect a 3-amp fused jumper wire between the door ajar switch signal circuit of the appropriate passenger ajar switch assembly harness connector and a good ground.
  5. With a scan tool, observe the Passenger Door Ajar Sw. parameter in the BCM data list.

Does the scan tool display Door Ajar?

Go to Step 13

Go to Step 18

13

Is the door ajar indicator illuminated?

Go to Step 14

Go to Step 19

14

  1. Connect a 3-amp fused jumper wire between the door ajar switch signal circuit of the appropriate passenger ajar switch assembly harness connector and the ground circuit of the appropriate passenger ajar switch assembly harness connector.
  2. With a scan tool, observe the Passenger Door Ajar Sw. parameter in the BCM data list.

Does the scan tool display Door Ajar?

Go to Step 20

Go to Step 22

15

Test the left front door ajar switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 26

Go to Step 21

16

Test the appropriate door ajar switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 26

Go to Step 21

17

Test the left front door ajar switch signal circuit for an open. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 26

Go to Step 21

18

Test the appropriate door ajar switch signal circuit for an open. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 26

Go to Step 21

19

Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 26

Go to Step 23

20

Inspect for poor connections at the harness connector of the appropriate door ajar switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 26

Go to Step 24

21

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

Did you find and correct the condition?

Go to Step 26

Go to Step 25

22

Repair the open in the appropriate ground circuit. Refer to Wiring Repairs and Connector Repairs.

Did you find and correct the condition?

Go to Step 26

--

23

Replace the IPC. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 26

--

24

Replace the appropriate ajar switch assembly.

Did you complete the replacement?

Go to Step 26

--

25

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 26

--

26

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2