GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Was the Lighting Systems Diagnostic System Check Performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Disconnect the turn/headlamp switch assembly connector C2.
  2. Test for an open in the ground circuit 251. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Was an open found and corrected?

System OK

Go to Step 3

3

Use a fused jumper in order to ground terminal B of the turn/headlamp switch connector.

Do the high beams light?

Go to Step 4

Go to Step 5

4

Replace the turn/headlamp switch assembly. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Is the repair complete?

System OK

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5

Test for an open in CKT 1200 between the turn/headlamp switch assembly and each headlamp assembly. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Was a condition found and corrected?

System OK

Go to Step 6

6

Inspect for poor connections at each headlamp assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 7

7

Replace the left and right headlamp bulbs. Refer to Headlamp Bulb Replacement .

Is the repair complete?

System OK

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