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?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Do the turn signals operate properly?

--

Go to Step 3

Go to Lamps Inoperative - Left and/or Right Side Front Switches

3

  1. Turn ON the hazard flasher switch.
  2. Test the hazard flasher input circuit for ground at the turn signal/hazard flasher module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the hazard flasher input circuit grounded with the switch ON?

--

Go to Step 4

Go to Step 6

4

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 11

Go to Step 5

5

Replace the turn signal/hazard flasher module. Refer to Hazard Lamp Flasher Replacement .

Did you complete the replacement?

--

Go to Step 11

--

6

Test the hazard flasher input circuit for ground at the hazard flasher switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the hazard flasher input circuit grounded at the hazard switch?

--

Go to Step 7

Go to Step 8

7

Repair the open or high resistance in the hazard flasher input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did to complete the repair?

--

Go to Step 11

--

8

Test the ground circuit of the hazard flasher switch for high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 9

9

Inspect for poor connections at the hazard flasher 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 11

Go to Step 10

10

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

Did you complete the replacement?

--

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you find and correct the condition?

--

System OK

Go to Step 2