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 ON position.
  2. Place the turn signal switch in the inoperative position.
  3. Backprobe the turn signal switch connector C202 with a DMM from cavity B3 (DK GRN) (LH) or cavity B2 (LT GRN) (RH) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 3

Go to Step 6

3

Backprobe the hazard switch assembly connector with a DMM from cavity B (DK GRN) (LH) or cavity D (LT GRN) (RH) to ground.

Is voltage within specified range?

10-15 V

Go to Step 4

Go to Step 7

4

Backprobe the hazard switch assembly connector with a DMM from cavity K (LT BLU) (LH) or cavity H (DK BLU) (RH) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 5

Go to Step 8

5

Repair the open in CKT 14 (LT BLU) (LH) or CKT 15 (DK BLU) (RH) between the hazard switch assembly and C201. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

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Go to Step 11

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6

Replace the turn signal switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column-Tilt.

Is the turn signal switch replacement complete?

--

Go to Step 11

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7

Repair the open in CKT 1428 (DK GRN) (LH) or CKT 1427 (LT GRN) (RH) between the turn signal switch and the hazard switch assembly. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 11

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8

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the hazard switch assembly connector.
  3. Disconnect the LH or RH front and rear turn signal lamps.
  4. Connect a DMM from the hazard switch assembly connector cavity K (LT BLU) (LH) or cavity H (DK BLU) (RH) to ground.

Is the resistance less than the specified value?

5 ohms

Go to Step 9

Go to Step 10

9

Repair the short to ground in CKT 14 (LT BLU) (LH) or CKT 15 (DK BLU) (RH). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Step 11

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10

Replace the hazard switch assembly. Refer to Hazard Warning Switch Replacement .

Is the hazard switch assembly replacement complete?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK.

Go to Step 2