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. Disconnect the hazard switch connector.
  2. Connect a test lamp between terminal C of the hazard switch connector and ground.
  3. Turn the ignition switch to the RUN position.

Does the test lamp light?

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Go to Step 3

Go to Step 4

3

Connect a test lamp between terminal A and terminal C of the hazard switch connector.

Does the test lamp light?

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Go to Step 5

Go to Step 6

4

Backprobe the left IP wiring harness junction block connector C1 with a test lamp between terminal B4 and ground.

Does the test lamp light?

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Go to Step 7

Go to Step 8

5

  1. Reconnect the hazard switch connector.
  2. Backprobe the hazard switch connector with a test lamp between terminal F and ground.
  3. Turn the left turn signal ON.

Does the test lamp flash?

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Go to Step 10

Go to Step 9

6

Repair the open in the Hazard Switch ground circuit between the hazard switch and ground splice pack G201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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System OK

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7

Repair the open in the Hazard Switch Fuse Output-Ignition circuit between the left IP wiring harness junction block and the hazard switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

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8

Replace the left IP wiring harness junction block.

Is the repair complete?

--

System OK

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9

Replace the hazard switch.

Is the repair complete?

--

System OK

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10

  1. Backprobe the turn/headlamp switch assembly connector C2 with a test lamp between terminal D and ground.
  2. Leave the left turn signal ON.

Does the test lamp flash?

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Go to Step 12

Go to Step 11

11

Repair the open in the Turn Signal Flasher Output circuit between the hazard switch and the turn/headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

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12

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?

--

System OK

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