GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the headlight system check performed?

--

Go to Step 2

Go to Headlight System Check

2

  1. Check the bulbs for opens.
  2. Check the connectors for a poor connection.

Are the bulbs and/or connectors OK?

--

Go to Step 4

Go to Step 3

3

  1. Replace the bulbs.
  2. Repair the poor connections.

Has the repair been made?

--

Go to Headlight System Check

--

4

  1. Turn the headlamp switch to the ON position.
  2. Turn the headlamp dimmer switch to the LOW position.
  3. Using a test light, backprobe the underhood accessory wiring junction block harness connector C3 terminal F10 to ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 5

5

Using a test light backprobe connector C201 terminal L to ground.

Does the test light illuminate?

--

Go to Step 9

Go to Step 7

6

Replace the underhood accessory wiring junction block. Refer to Accessory Wiring Junction Block Replacement in Body Front End.

Has the repair been made?

--

Go to Headlight System Check

--

7

Using a test light, backprobe between C201 terminal L to terminal W.

Does the test light illuminate?

--

Go to Step 10

Go to Step 8

8

Repair a poor connection or an open in circuit 1750, between C201 terminal W and G201.

Has the repair been made?

--

Go to Headlight System Check

--

9

Repair the poor connection or an open in circuit 1201 between the underhood accessory wiring junction block harness connector C2 terminal F10 to connector C201 terminal L.

Has the repair been made?

--

Go to Headlight System Check

--

10

Replace the headlamp switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Has the repair been made?

--

Go to Headlight System Check

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