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

Use the scan tool in order to read the Body Control Module (BCM) current trouble codes.

Does the scan tool show any DTCs?

--

Go to Diagnostic System Check - Body Control System in Body Control System

Go to Step 3

3

  1. Disconnect the headlamp, LH low beam connector.
  2. Move the headlamp switch to the HEAD position.
  3. Move the multifunction switch to the LOW BEAM position.
  4. Connect a test lamp from the headlamp, LH low beam connector terminal A to ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open in CKT 712 (YEL) between the headlamp, LH low beam connector and the underhood fuse block.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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5

Connect a test lamp from the headlamp, LH low beam connector terminal A to terminal B.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 6

6

Locate and repair an open in CKT 525 (YEL) between the headlamp, LH low beam connector and the underhood fuse block.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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7

Replace the headlamp, LH low beam bulb.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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