GM Service Manual Online
For 1990-2009 cars only

Headlamps Inoperative - Left High Beam Standard

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the left high beam headlamp is inoperative.

Do the headlamps operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the right high beam headlamp connector.
  2. Move the headlamp switch to the HEAD position.
  3. Move the multifunction switch to the HIGH BEAM position.
  4. Connect a test lamp from the headlamp, LH high beam connector terminal A to ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 7

4

Connect a test lamp from the headlamp, LH high beam connector terminal A to terminal B. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open or high resistance in CKT 524 (PPL) between the headlamp, LH high beam connector and the underhood fuse block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 10

--

6

Replace the headlamp high beam bulb. Refer to Headlamp Replacement .

Is the repair complete?

--

Go to Step 10

--

7

Using a test terminal adapter kit, connect a test lamp from DRL relay pin 30 to ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 8

8

Replace the DRL relay.

Is the repair complete?

--

Go to Step 10

--

9

Locate and repair the open or high resistance in CKT 711 (DK GRN/WHT) between the underhood fuse block and the headlamp LH high beam bulb. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3

Headlamps Inoperative - Left High Beam Envoy/Diamond Edition 1SK

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the left high beam headlamp is inoperative.

Do the headlamps operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Move the headlamp switch to the HEAD position.
  2. Move the multifunction switch lever to the HIGH BEAMS position.
  3. Connect a test lamp between ground and terminal A of the LH High Beam connector. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open, high resistance or short to ground in CKT 711 (DK GRN/WHT). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 8

--

5

Connect a test lamp between terminal A and terminal B of the LH High Beam connector. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 7

6

Replace the left high beam bulb. Refer to Headlamp Replacement .

Is the repair complete?

--

Go to Step 8

--

7

Locate and repair the open or high resistance in CKT 150 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3