GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the ON position.
  2. Place the turn signal switch to a turn left or a turn right position.

Do the turn signal tamps flash ON and OFF?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the hazard switch.
  2. Connect a test lamp between the TURN SIGNAL Fuse battery positive voltage circuit and ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

4

  1. Reconnect the hazard switch.
  2. At C201, connect a test lamp between the turn signal flasher supply circuit and ground.

Does the test lamp flash ON and OFF?

Go to Step 5

Go to Step 6

5

At C201, connect a test lamp between the turn signal flasher supply circuit of the hazard switch and inoperative turn signal lamps supply voltage circuit.

Does the test lamp flash ON and OFF?

Go to Step 9

Go to Step 8

6

Test for a high resistance or an open in the turn signal flasher supply circuit. Refer to Wiring Repairs and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

7

Repair a high resistance or an open in the TURN SIGNAL Fuse battery positive voltage circuit. Refer to Wiring Repairs and to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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8

Repair a high resistance or an open in the turn signal lamps supply voltage circuit. Refer to Wiring Repairs and to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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9

Replace the turn signal switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 11

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10

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

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 2