GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlight System Check?

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Go to Step 2

Go to Headlight System Check

2

  1. Disconnect the left low beam headlamp connector.
  2. Connect a DMM between the left low beam headlamp connector, cavity A (base), cavity B (quad) for CKT 150 (BLK) and ground.

Is there continuity?

--

Go to Step 3

Go to Step 4

3

  1. Place the headlamp and panel dimmer switch in the headlamp position.
  2. Operate the headlamp dimmer switch in order to select the low beam position.
  3. Connect a test lamp between the left low beam headlamp connector, cavity C (base) cavity A (quad) for CKT 12 (TAN) and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4

Repair the open in CKT 150 (BLK) between the left low beam headlamp and G113. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Headlight System Check

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5

If the filament is not open, replace the left low beam headlamp socket.

Is the repair complete?

--

Go to Headlight System Check

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6

Repair the open in CKT 12 (TAN) between S120 and the left low beam headlamp. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Headlight System Check

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