GM Service Manual Online
For 1990-2009 cars only

Courtesy or Dome Lamps Always On Except Luxury

Step

Action

Value(s)

Yes

No

DEFINITION: Use this diagnostic in order to diagnose the Dome and/or Courtesy Lamps Always On with all vehicle doors closed and the dome lamp switch in the OFF position. On vehicles equipped with remote keyless entry or an interior lamp control module will cause the interior lamps to remain in the ON position after the door is opened for approximately 40 seconds or until an ignition ON cycle has occurred.

1

Did you perform the Interior Lamps System Check?

--

Go to Step 2

Go to Interior Lamps System Check

2

  1. Close the vehicle doors.
  2. Disconnect the headlamp and the panel dimmer switch.

Do the courtesy and/or dome lamps turn OFF?

--

Go to Step 3

Go to Step 7

3

  1. Close the vehicle doors.
  2. Connect a , set on Ohms, between the headlamp and the panel dimmer switch connector cavity L and ground.

Is there continuity?

--

Go to Step 5

Go to Step 6

4

Is the vehicle a utility with cargo doors?

--

Go to Step 12

Go to Step 5

5

  1. Repair the short to ground in CKT 328 (PPL) between the headlamp and the panel dimmer switch and door jamb switches.
  2. If no short to ground is found, replace the faulty door jamb switches.

Is the repair complete?

--

Go to Interior Lamps System Check

--

6

Replace the headlamp and the panel dimmer switches.

Is the repair complete?

--

Go to Interior Lamps System Check

--

7

Disconnect the interior lamp control module or the keyless entry module.

Do the courtesy and/or dome lamps turn OFF?

--

Go to Step 8

Go to Step 11

8

Connect a , set on Ohms, between CKT 157 (GRY) at cavity B of the interior lamp control or cavity K of the keyless entry module and ground.

Is there continuity?

--

Go to Step 9

Go to Step 10

9

Repair the short to ground in CKT 157 (GRY) between the headlamp and the panel dimmer switch and wither the interior lamp control module or the keyless entry module.

Is the repair complete?

--

Go to Interior Lamps System Check

--

10

Replace the interior lamp control module or the keyless entry module. Refer to Remote Control Door Lock Receiver Replacement .

Is the repair complete?

--

Go to Interior Lamps System Check

--

11

Repair the short to ground in CKT 156 (WHT) between the headlamp and the panel dimmer switch and the dome and/or courtesy lamps, the interior lamp control module or the keyless entry module.

Is the repair complete?

--

Go to Interior Lamps System Check

--

12

With a still connected at the headlamp and the panel dimmer switch cavity L and ground, disconnect the door lock control module.

Is there still continuity?

--

Go to Step 5

Go to Step 13

13

Connect a, set on Ohms, between the door lock control module connector cavity F and ground.

Is there continuity?

--

Go to Step 14

Go to Step 15

14

  1. Repair the short to ground in CKT 1897 (ORN/BLK) between the door lock control module and the rear door jamb switch.
  2. If no short to ground is found, replace the rear door jamb switch.

Is the repair complete?

--

Go to Interior Lamps System Check

--

15

Replace the door lock control module. Refer to Remote Control Door Lock Receiver Replacement .

Is the repair complete?

--

Go to Interior Lamps System Check

--

Courtesy or Dome Lamps Always On Luxury

Step

Action

Value(s)

Yes

No

1

  1. Close all vehicle doors.
  2. Connect a DMM between connector C304 cavity F9 (drivers door) and connector C305 cavity D3 (passengers door) to ground.

Is there continuity?

--

Go to Step 2

Go to Step 3

2

Check for a short to ground in CKT 328 (PPL) (passengers door) or CKT (TAN) (drivers door).

If no short was found, replace door jamb switch(s) as necessary.

Is the repair complete?

--

System OK

--

3

  1. Disconnect connector C304.
  2. Connect a DMM between connector C304 cavity E7 on body control module side and ground.

Is there continuity?

--

Go to Step 4

Go to Step 5

4

Check for a short to ground in CKT  157 (GRY) between C304 and the body control module.

If no short was found, replace body control module. Refer to Body Control Module Replacement .

Is the repair complete?

--

System OK

--

5

  1. Disconnect headlamp and panel dimmer switch.
  2. Connect a DMM between connector C304 cavity E7 on IP harness side to ground.

Is there continuity?

--

Go to Step 6

Go to Step 7

6

Repair short to ground in CKT 157 (GRY) between connector C304 cavity E7 and headlamp and panel dimmer switch.

Is the repair complete?

--

System OK

--

7

Repair short to ground.

Is repair complete?

--

System OK

--