GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn ON the ignition, with the engine OFF.
  2. Place the turn signal switch in the LEFT TURN position.
  3. Place the turn signal switch in the RIGHT TURN position.

Do the turn signal lamps operate properly?

Go to Step 3

Go to Turn Signal Lamps and/or Indicators Inoperative

3

Place the hazard switch in the ON position.

Do the hazard lamps flash?

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

Go to Step 4

4

  1. Disconnect the hazard switch.
  2. Connect a 3 amp fused jumper wire between the hazard switch signal circuit of the turn signal/hazard flasher module and a good ground.

Do the hazard lamps flash?

Go to Step 5

Go to Step 6

5

Connect a 3 amp fused jumper wire between the hazard switch signal circuit of the turn signal/hazard flasher module and the ground circuit of the hazard switch.

Do the hazard lamps flash?

Go to Step 8

Go to Step 9

6

Test for an open or high resistance in the hazard switch signal circuit of the turn signal/hazard flasher module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Inspect for poor connections at the turn signal/hazard flasher module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

8

Inspect for poor connections at the hazard switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

9

Repair the open or high resistance in the ground circuit of the hazard switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 12

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10

Replace the turn signal/hazard flasher module. Refer to Hazard and Turn Signal Flasher Replacement .

Did you complete the replacement?

Go to Step 12

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11

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

Did you complete the replacement?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2