GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

  1. Turn ON the ignition with the engine OFF.
  2. Turn ON the turn signal.

Do the turn signals function properly?

Go to Step 4

Go to Turn Signal Lamps Inoperative

4

  1. Turn off the turn signal.
  2. Turn OFF the ignition.
  3. Remove and inspect the HAZ LP fuse.

Is the fuse open?

Go to Step 9

Go to Step 5

5

  1. Re-install the fuse.
  2. Connect a test lamp (back probe) between the fused battery positive voltage circuit at C201A to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 7

6

  1. Turn ON the hazard lights.
  2. Connect a test lamp (back probe) between the turn/hazard flasher feed circuit of C201C to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 10

7

Repair the open in the fused battery positive voltage circuit between the engine wiring harness junction block and C201A. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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8

Repair the open in the turn/hazard flasher feed circuit between the turn/hazard switch and the turn/hazard flasher. Refer to Wiring Repairs in Wiring Systems.

If no open is found, replace the turn/hazard flasher. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column.

Did you complete the repair?

Go to Step 11

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9

Repair the short to ground in the turn/hazard flasher feed circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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10

Replace the turn/hazard switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Did you complete the replacement?

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3