GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Place the turn/hazard headlamps switch assembly into the HIGH position.
  2. Disconnect the daytime running lamps (DRL) relay connector.
  3. Connect the test lamp between terminal 4 of the DRL harness connector and ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Connect the fused jumper between terminal 4 and terminal 3 of the DRL relay harness connector.

Does the left high beam headlamp operate?

--

Go to Step 4

Go to Step 5

3

Repair the open in CKT 740 between the fuse block and the DRL relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

4

Replace the DRL relay.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

5

  1. Reconnect the DRL relay connector.
  2. Disconnect the left composite headlamp assembly connector.
  3. Connect the test lamp between terminal B of the left composite headlamp assembly harness connector and ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6

Replace the left composite headlamp assembly.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

7

Repair the open in CKT 593 between the DRL relay and the left composite headlamp assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--