GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Interior Lamps System Check?

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Go to Step 2

Go to Interior Lamps System Check

2

  1. Move the dome lamp switch to the DOOR position.
  2. Open the left front door.
  3. Use a J 39200 DMM in order to backprobe the left IP junction block connector C3 and measure the voltage between terminal C4 and ground.

Doess the voltage measure at the specified value?

B+

Go to Step 3

Go to Step 11

3

  1. Disconnect the dome lamp connector.
  2. Use the J 39200 DMM in order to measure the voltage between the C terminal of the dome lamp connector and ground .

Does the voltage measure at the specified value?

B+

Go to Step 4

Go to Step 5

4

Use the J 39200 DMM in order to measure the voltage between the A terminal and the C terminal of the dome lamp connector.

Does the voltage measure at the specified value?

B+

Go to Step 6

Go to Step 7

5

Repair the open in CKT 1732 between the left IP junction block and the dome lamp. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

--

6

Use the J 39200 DMM in order to measure the voltage between the B terminal and the C terminal of the dome lamp connector.

Does the voltage measure at the specified value?

B+

Go to Step 8

Go to Step 9

7

Use the J 39200 DMM in order to measure the voltage between the left IP junction block C3 connector and B+ and between the C10 connector and B+.

Does the voltage measure at the specified value?

B+

Go to Step 10

Go to Step 11

8

Replace the dome lamp. Refer to Dome Lamp Replacement .

Is the repair complete?

--

Go to Interior Lamps System Check

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9

Repair the open in CKT 750 between the dome lamp and the ground splice pack G401. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

--

10

Repair the open in CKT 156 between the left IP junction block and the dome lamp. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

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11

Replace the left IP junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

--

Go to Interior Lamps System Check

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