GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect connector C200.
  2. Connect a fused (3 amp) jumper between the connector C200 terminal C6 (leading towards the instrument cluster) and ground.
  3. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 2

Go to Step 30

2

  1. Reconnect connector C200.
  2. Disconnect connector C303.
  3. Connect the fused (3 amp) jumper between the connector C303 terminal H (leading towards the instrument cluster) and ground.
  4. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 3

Go to Step 31

3

  1. Reconnect connector C303.
  2. Disconnect the left front door lock connector C1.
  3. Connect the fused (3 amp) jumper between the left front door lock connector terminal B (leading towards the instrument cluster) and ground.
  4. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 4

Go to Step 32

4

Connect the fused (3 amp) jumper between the left front door lock connector C1 terminal B and terminal D.

Is the DOOR AJAR indicator on?

--

Go to Step 5

Go to Step 6

5

  1. Reconnect the left front door lock connector.
  2. Turn the ignition switch to the RUN position.
  3. Press the plunger to close the contacts in the switch.

Is the DOOR AJAR indicator on?

--

Go to Step 8

Go to Step 7

6

Repair poor connection or open in CKT 750 between the left front door lock connector C1 terminal D and G302.

Has the repair been made and the system rechecked?

--

System OK

--

7

Replace the left front door lock. Refer to Front Side Door Lock Replacement in Doors.

Has the repair been made and the system rechecked?

--

System OK

--

8

  1. Disconnect connector C302.
  2. Connect a fused (3 amp) jumper between connector C302 terminal H and ground.
  3. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 9

Go to Step 33

9

  1. Reconnect connector C302.
  2. Disconnect the right door lock connector C1.
  3. Connect the fused (3 amp) jumper between the right front door lock connector C1 terminal C and ground.
  4. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 10

Go to Step 34

10

  1. Connect the fused (3 amp) jumper between the right front door lock connector C1 terminal C and terminal A.
  2. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 11

Go to Step 12

11

  1. Reconnect the right front door lock connector C1.
  2. Turn the ignition switch to the RUN position.
  3. Press the plunger to close the contacts in the switch.

Is the DOOR AJAR indicator on?

--

Go to Step 14

Go to Step 13

12

Repair poor connection or open in CKT 750 between the right front door lock connector C1 terminal A and G302.

Has the repair been made and the system rechecked?

--

System OK

--

13

Replace the right front door lock. Refer to Front Side Door Lock Replacement in Doors.

Has the repair been made and the system rechecked?

--

System OK

--

14

  1. Disconnect connector C402.
  2. Connect a fused (3 amp) jumper between connector C402 terminal E and ground.
  3. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 15

Go to Step 35

15

  1. Reconnect connector C402.
  2. Disconnect the liftgate lock connector C1.
  3. Connect the fused (3 amp) jumper between the liftgate door lock connector C1 terminal B and ground.
  4. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 16

Go to Step 36

16

  1. Connect the fused (3 amp) jumper between the liftgate lock connector C1 terminal B and terminal D.
  2. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 17

Go to Step 18

17

  1. Reconnect the liftgate lock connector C1.
  2. Turn the ignition switch to the RUN position.
  3. Press the plunger to close the contacts in the switch.

Is the DOOR AJAR indicator on?

--

Go to Step 20

Go to Step 19

18

Repair poor connection or open in CKT 450 between the liftgate lock connector C1 terminal D and G401.

Has the repair been made and the system rechecked?

--

System OK

--

19

Replace the liftgate lock. Refer to Liftgate Lock Cylinder Replacement in Body Rear End.

Has the repair been made and the system rechecked?

--

System OK

--

20

  1. Disconnect the right sliding door jamb switch connector.
  2. Connect a fused (3 amp) jumper between the right sliding door jamb switch connector terminal A and ground.
  3. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 21

Go to Step 37

21

  1. Connect the fused (3 amp) jumper between the right sliding door jamb switch connector terminal A and terminal C.
  2. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 22

Go to Step 23

22

  1. Reconnect the right sliding door jamb switch connector.
  2. Turn the ignition switch to the RUN position.
  3. Press the plunger to close the contacts in the switch.

Is the DOOR AJAR indicator on?

--

System OK (if equipped with left sliding door Go to Step 25 )

Go to Step 24

23

Repair poor connection or open in CKT 750 between the right sliding door jamb switch connector terminal C and G302.

Has the repair been made and the system rechecked?

--

System OK

--

24

Replace the right sliding door jamb switch. Refer to Door Jamb Switch Replacement - Sliding Door in Doors.

Has the repair been made and the system rechecked?

--

System OK

--

25

  1. Disconnect the left sliding door jamb switch connector.
  2. Connect a fused (3 amp) jumper between the left sliding door jamb switch connector terminal A and ground.
  3. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 26

Go to Step 38

26

  1. Connect the fused (3 amp) jumper between the left sliding door jamb switch connector terminal A and terminal C.
  2. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 27

Go to Step 28

27

  1. Reconnect the left sliding door jamb switch connector.
  2. Turn the ignition switch to the RUN position.
  3. Press the plunger to close the contacts in the switch.

Is the DOOR AJAR indicator on?

--

System OK

Go to Step 29

28

Repair poor connection or open in CKT 750 between the left sliding door jamb switch connector terminal C and G302.

Has the repair been made and the system rechecked?

--

System OK

--

29

Replace the left sliding door jamb switch. Refer to Door Jamb Switch Replacement - Sliding Door in Doors.

Has the repair been made and the system rechecked?

--

System OK

--

30

  1. Using a fused (3 amp) jumper, backprobe between the instrument cluster connector C1 terminal G and ground.
  2. Turn the ignition switch to the RUN position.

Is the DOOR AJAR indicator on?

--

Go to Step 39

Go to Step 40

31

Repair poor connection or open in CKT 804 between the connector C200 terminal C6 and connector C303 terminal H.

Has the repair been made and the system rechecked?

--

System OK

--

32

Repair poor connection or open in CKT 804 between the left front door lock connector C1 terminal B and connector C303 terminal H.

Has the repair been made and the system rechecked?

--

System OK

--

33

Repair poor connection or open in CKT 804 between S308 and connector C302 terminal H.

Has the repair been made and the system rechecked?

--

System OK

--

34

Repair poor connection or open in CKT 804 between the right front door lock connector C1 terminal C and S308.

Has the repair been made and the system rechecked?

--

System OK

--

35

Repair poor connection or open in CKT 804 between S308 and connector C402 terminal E.

Has the repair been made and the system rechecked?

--

System OK

--

36

Repair poor connection or open in CKT 804 between the liftgate lock connector C1 terminal B and S308.

Has the repair been made and the system rechecked?

--

System OK

--

37

Repair poor connection or open in CKT 804 between the right sliding door jamb switch connector terminal A and S308.

Has the repair been made and the system rechecked?

--

System OK

--

38

Repair poor connection or open in CKT 804 between the left sliding door jamb switch connector terminal A and S308.

Has the repair been made and the system rechecked?

--

System OK

--

39

Repair poor connection or open in CKT 804 between the instrument cluster connector C1 terminal G and G200 terminal C6.

Has the repair been made and the system rechecked?

--

System OK

--

40

  1. Check the DOOR AJAR indicator bulb and bulb connection.
  2. If OK, replace the instrument cluster. Refer to Instrument Cluster Replacement .

Has the repair been made and the system rechecked?

--

System OK

--