GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition switch to the RUN position.
  2. Use a test lamp in order to backprobe connector C2 of the turn/headlamp switch assembly between terminal C (left turn signal lamps) or terminal B (right turn signal lamps) and ground.
  3. Turn the inoperative turn signal on.

Does the test lamp light?

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Go to Step 3

Go to Step 4

3

Use a test lamp in order to backprobe the right (right lamps inoperative) or the left (left lamps inoperative) IP wiring harness junction block connector C1 between terminal E4 (left turn signal lamps) or terminal F2 (right turn signal lamps) and ground.

Does the test lamp light?

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Go to Step 5

Go to Step 6

4

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

Is the repair complete?

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System OK

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5

Replace the right (right lamps inoperative) or the left (left lamps inoperative) IP wiring harness junction block.

Is the repair complete?

--

System OK

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6

Repair the open in the Turn Signal Lamp Feed circuit between the IP wiring harness junction block and the turn/headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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System OK

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