GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the DRL System Check?

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Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2

  1. Place the headlamp switch in the ON position.
  2. Use a test lamp in order to backprobe the underhood junction block between terminal A 12 of connector C3 and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

Use a test lamp in order to backprobe the turn/headlamp switch assembly between terminal 34 of the turn/headlamp switch assembly connector C1 and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4

Replace the underhood junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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5

Replace the turn/headlamp switch assembly. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column-Tilt.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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6

Repair the open in CKT 1201 between the underhood junction block and the turn/headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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