GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Check the RH high beam headlamp bulbs 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?

--

Go to Step 2

Go to Step 10

2

  1. Disconnect C142.
  2. Using a J35616-A kit, connect jumpers wires between C142 terminal F female and terminal F male and terminal G female to terminal G male.
  3. Turn the high beam headlamps on.
  4. Using a test light, probe between C142 terminal F and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 3

3

Using a test light, probe between the underhood accessory wiring junction block harness connector C3 terminal E2 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 9

4

Repair the poor connection or open in circuit 1740 between the underhood accessory wiring junction block harness connector C3 terminal E2 and the RH headlamp harness connector C142 terminal F.

Has the repair been made?

--

Go to Headlight System Check

--

5

  1. Disconnect C142.
  2. Using a J35616-A kit, connect jumpers wires between C142 terminal F female and terminal F male and terminal G female to terminal G male.
  3. Turn on the headlamp switch to the HIGH position.
  4. Using a test light, probe between C142 terminal G and ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 8

6

  1. Reconnect C142.
  2. Turn headlamps on high beam.
  3. Using a test light, backprobe between the underhood accessory wiring junction block harness connector C3 terminal C8 and ground.

Does the test light illuminate?

--

Go to Step 9

Go to Step 7

7

Repair the poor connection or open in circuit 1200 between the RH headlamp harness connector C142 terminal G and the underhood accessory wiring junction block harness connector C3 terminal C8.

Has the repair been made?

--

Go to Headlight System Check

--

8

Replace the RH headlamp. Refer to Headlamp Replacement .

Has the repair been made?

--

Go to Headlight System Check

--

9

Check for a poor connection at the underhood accessory wiring junction block.

Is there a poor connection?

--

Go to Step 10

Go to Step 11

10

Replace the damaged component or repair the poor connection.

Has the repair been made?

--

Go to Headlight System Check

--

11

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

--