GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Check the RH high beam headlamp bulb for a damaged or open filament.
  2. Check the RH headlamp connector 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 4

Go to Step 3

3

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

Has the repair been made?

--

Go to Headlight System Check

--

4

Using a test light, backprobe between the underhood accessory wiring junction block harness connector C3 terminal A7 and ground.

Does the test light illuminate?

--

Go to Step 8

Go to Step 5

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 1200 between the right headlamp wiring harness connector terminal G and the underhood accessory wiring junction block harness connector C3 terminal A7.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

7

Replace the right headlamp. Refer to Headlamp Replacement .

Has the repair been made and the system rechecked?

--

Gog to Headlight System Check

--

8

Replace the underhood wiring junction block. Refer to Accessory Wiring Junction Block Replacement .

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

9

Replace the damaged component.

Has the repair been made?

--

Go to Headlight System Check

--