GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Inspect the right high beam headlamp bulb for a damaged or open filament.
  2. Inspect the right headlamp connector in order to verify that the seal is into missing or damaged.

Is the headlamp bulb and connector OK?

--

Go to Step 2

Go to Step 9

2

  1. Disconnect the headlamp dimmer switch.
  2. Using a test light, backprobe between the right headlamp harness connector C142 terminal F and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

3

Repair a poor connection or an open in circuit 11 between the underhood accessory wiring junction block harness connector C3 terminal B11 and the right headlamp harness connector C142 terminal F.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

4

Using a test light, backprobe between the underhood accessory wiring junction block harness connector C3 terminal B11 and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 8

5

Using a test light, backprobe between the right headlamp harness connector C142 terminal F and terminal G.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

Repair a poor connection or an open in circuit 1750 between the right headlamp wiring harness connector C142 terminal G and G101.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

7

Replace the right headlamp. Refer to Headlamp Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

8

Replace the underhood wiring junction block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

9

Replace the damaged component.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--