GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Courtesy or Dome Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the Interior Lamps System Check?

--

Go to Step 2

Go to Interior Lamps System Check

2

Move the courtesy lamp switch to the ON position.

Do all of the lamps light?

--

Go to Step 4

Go to Step 3

3

Do some of the lamps light?

--

Go to Step 14

Go to Step 6

4
  1. Move the courtesy lamp switch to the OFF position.
  2. Move the dome lamp defeat switch to the OFF position.
  3. While opening and closing each door, observe the lamps.

Do all of the lamps light when each door is open?

--

Go to Interior Lamps System Check

Go to Step 5

5

Are the lamps inoperative only when certain doors are open?

--

Go to Step 15

Go to Step 8

6

Using a test lamp, backprobe the front dome lamp connector with a test lamp from CKT 40 (ORN) to ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 16

7

Using a J 35616-200 , backprobe the headlamp and panel dimmer switch connector from cavity M to ground.

Does the test lamp light?

--

Go to Step 17

Go to Step 18

8
  1. Open the door.
  2. Ensure that the dome defeat switch is in the OFF position.
  3. Disconnect the interior lamp control module connector.
  4. Connect a self-powered test lamp from the interior lamp control module connector, cavity B, to ground.

Does the test lamp light?

--

Go to Step 11

Go to Step 9

9
  1. Disconnect the headlamp and panel dimmer switch connector.
  2. Connect a self-powered test lamp from the headlamp and panel dimmer switch, cavity B, to the interior lamp control module connector, cavity B.

Does the test lamp light?

--

Go to Step 10

Go to Step 19

10
  1. Reconnect the headlamp and panel dimmer switch connector.
  2. Using a self-powered test lamp, backprobe from cavity B to cavity L.

Does the test lamp light?

--

Go to Step 20

Go to Step 21

11

With the interior lamp control module connector disconnected, connect a J 35616-200 from cavity E to ground.

Does the test lamp light?

--

Go to Step 12

Go to Step 22

12

Connect a J 35616-200 between the interior lamp control module, cavity C, and ground.

Does the test lamp light?

--

Go to Step 13

Go to Step 23

13

Connect a self-powered test lamp between the interior lamp control module, cavity D, and ground.

Does the test lamp light?

--

Go to Step 24

Go to Step 25

14
  1. Inspect for an open in the appropriate circuit:
    2. • CKT 40 (ORN) between the splice and the affected lamp
    • CKT 156 (WHT) between the splice and the affected lamp
    • CKT 150 (BLK) between the affected lamp and ground G400.
  2. Repair the circuit, as necessary.

Did you find and correct a condition?

--

Go to Interior Lamps System Check

Go to Step 26

15
  1. Inspect for an open in CKT 328 (PPL) between the splice and the affected door jamb switch.
  2. Repair the circuit, as necessary.

Did you find and correct a condition?

--

Go to Interior Lamps System Check

Go to Step 27

16

Repair the open in CKT 40 (ORN) between splice S242 and the instrument panel fuse block.

Is the repair complete?

--

Go to Interior Lamps System Check

--

17

Repair the open in CKT 156 (WHT) between the headlamp and panel dimmer switch and splice S209.

Is the repair complete?

--

Go to Interior Lamps System Check

--

18
  1. Inspect for an open in CKT 150 (BLK) between the headlamp and panel dimmer switch and ground G200.
  2. Repair the circuit, necessary.

Did you find and correct the condition?

--

Go to Interior Lamps System Check

Go to Step 21

19

Repair the open in CKT 157 (GRY) between the headlamp and panel dimmer switch and the interior lamp control module.

Is the repair complete?

--

Go to Interior Lamps System Check

--

20

Repair the open in CKT 150 (BLK) between the headlamp and panel dimmer switch and ground G200.

Is the repair complete?

--

Go to Interior Lamps System Check

--

21

Replace the headlamp and panel dimmer switch.

Is the repair complete?

--

Go to Interior Lamps System Check

--

22

Repair the open in CKT 156 (BLK) between the interior lamp control module and splice S246.

Is the repair complete?

--

Go to Interior Lamps System Check

--

23

Repair the open in CKT 40 (ORN) between the interior lamp control module and splice S248.

Is the repair complete?

--

Go to Interior Lamps System Check

--

24

Replace the interior lamp control module.

Is the repair complete?

--

Go to Interior Lamps System Check

--

25

Repair the open in CKT 150 (BLK) between the interior lamp control module and ground G202.

Is the repair complete?

--

Go to Interior Lamps System Check

--

26

Replace the affected lamp.

Is the repair complete?

--

Go to Interior Lamps System Check

--

27

Replace the affected door jamb switch.

Is the repair complete?

--

Go to Interior Lamps System Check

--