GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the headlight system check preformed?

--

Go to Step 2

Go to Headlight System Check

2

Does the flash to pass (FTP) function normally in the headlight system check?

--

Go to Step 3

Go to Step 4

3

Replace the headlight switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle n Steering Wheel and Column - Tilt. for service procedures.

Has the repair been made?

--

Go to Headlight System Check

--

4

  1. Inspect the bulbs for opens.
  2. Inspect the connectors for poor connections.

Are the bulbs and/or connectors OK?

--

Go to Step 6

Go to Step 5

5

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

Has the repair been made?

--

Go to Headlight System Check

--

6

  1. Turn the headlamps to the ON position.
  2. Turn the headlamp dimmer switch to the High position.
  3. Using a test light backprobe the underhood accessory wiring junction block harness connector C3 terminal E6 to ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

7

Using a test light, backprobe connector C201 terminal K to ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 9

8

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

--

9

Repair the poor connection or open in circuit 1200 of the underhood accessory wiring junction block harness connector C2 terminal E6 to Connector C201 terminal K.

Has the repair been made?

--

Go to Headlight System Check

--