GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the headlight system check performed?

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Go to Step 2

Go to Headlight System Check

2

  1. Check the RH low beam headlamp bulb for damage or open filament.
  2. Check the RH headlamp connector to be sure the connector seals are not damaged or missing.

Are the headlamp bulbs and connectors OK?

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Go to Step 3

Go to Step 8

3

  1. Disconnect connector C142.
  2. Using a test lamp probe between RH headlamp harness connector C142 terminal H and ground.

Is the test lamp on?

--

Go to Step 5

Go to Step 4

4

Repair poor connection or open in circuit 1740 between the underhood accessory wiring junction block harness connector C3 terminal F2 and the RH headlamp harness connector C142 terminal H.

Is the repair complete?

--

Go to Headlight System Check

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5

  1. Turn the headlamp switch to the Head position.
  2. Using a test lamp probe between connector C142 terminal J and B+.

Is the test lamp on?

--

Go to Step 7

Go to Step 6

6

Repair poor connection or open in circuit 1201 between the RH headlamp harness connector C142 terminal J and the underhood accessory wiring junction block harness connector C3 terminal A10.

Is the repair complete?

--

Go to Headlight System Check

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7

Replace the RH headlamp. Refer to Headlamp Replacement for service procedure.

Is the repair complete?

--

Go to Headlight System Check

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8

Replace the damaged component.

Is the repair complete?

--

Go to Headlight System Check

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