GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Envoy - 4WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamps Inoperative - Left High Beam

Headlamps Inoperative - Left High Beam Standard

Step

Action

Value(s)

Yes

No

1

Did you perform the DRL System Check?

--

Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2

Use the scan tool in order to read the current body control module (BCM) diagnostic trouble codes (DTCs).

Does the scan tool show any DTCs?

--

Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System

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.

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.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 524 (PPL) between the headlamp, LH high beam connector and the underhood fuse block.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

6

Replace the headlamp high beam bulb.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

7

Connect a test lamp from DRL relay pin 3 to ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 8

8

Replace the DRL relay.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

9

Locate and repair the open in CKT 711 (DK GRN/WHT) between the underhood fuse block and the headlamp LH high beam bulb.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

Headlamps Inoperative - Left High Beam Envoy

Step

Action

Value(s)

Yes

No

1

Did you perform the DRL System Check?

--

Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2
  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 each test point on the back of the LT HI fuse in the underhood fuse block.

Does the test lamp illuminate at both of the test points?

--

Go to Step 6

Go to Step 3

3

Does the test lamp illuminate at any test point?

--

Go to Step 4

Go to Step 5

4

Locate and repair a short to ground in CKT 711 (LT GRN/BLK).

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

5

Replace the underhood fuse block.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

6
  1. Disconnect the left high beam bulb.
  2. Inspect the bulb.

Is the left high beam bulb open?

--

Go to Step 7

Go to Step 8

7

Replace the left high beam bulb.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

8
  1. Connect a test lamp between CKT 711 (DK GRN/WHT), cavity A at the left high beam connector and ground.
  2. Move the headlamp switch to the HEAD position.
  3. Move the multifunction switch lever to the HIGH BEAMS position.

Does the test lamp illuminate?

--

Go to Step 10

Go to Step 9

9

Locate and repair the open in CKT 711 (DK GRN/WHT).

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

10

Locate and repair the open in CKT 150 (BLK).

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--