GM Service Manual Online
For 1990-2009 cars only

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. Move the headlamp switch to the HEAD position.
  2. Move the headlamp dimmer switch the LOW BEAM position.
  3. Use a test lamp in order to backprobe between C211, terminal E12 and ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 4

4

Locate and repair an open in CKT 525 (YEL) between the headlamp low beam bulbs and the multifunction switch.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

5

Replace the multifunction switch.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--