GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Interior Lights Dimming System Check performed?

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Go to Step 2

Go to Interior Lights Dimming System Check

2

  1. Remove the bulb from the license lamp connector.
  2. Connect a J 39200 DMM between the license lamp connector, cavity B for CKT 250 (BLK), and ground.

Is continuity present?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 250 (BLK) between the license lamp connector and ground G401.

Is the license lamp operative?

--

Go to Interior Lights Dimming System Check

Go to Step 4

4

  1. Connect an unpowered test lamp between the license lamp connector, cavity A for CKT 9 (BRN), and ground.
  2. Place the headlamp switch in the park lamps position.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Replace the license lamp bulb.

Is the license lamp operative?

--

Go to Interior Lights Dimming System Check

Go to Step 6

6

Repair the open in CKT 9 (BRN) between splice S402 and the license lamp connector.

Is the rear taillamp or the lamps operative?

--

Go to Interior Lights Dimming System Check

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