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 light, probe between the RH headlamp harness connector C142 terminal H and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair the 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.

Has the repair been made?

--

Go to Headlight System Check

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5

  1. Turn the headlamp switch to the Head position.
  2. Disconnect connector C142.
  3. Using a test light, probe between connector C142 terminal H and J.

Does the test light illuminate?

--

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.

Has the repair been made?

--

Go to Headlight System Check

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7

Replace the RH headlamp. Refer to Headlamp Replacement .

Has the repair been made?

--

Go to Headlight System Check

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8

Replace the damaged component.

Has the repair been made?

--

Go to Headlight System Check

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