GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Exterior Lights System Check?

--

Go to Step 2

Go to Exterior Lights System Check

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 ON position.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

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

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4

Use the test lamp in order to backprobe the left IP junction block connector C1 between terminal B4 and ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

5

  1. Reconnect the hazard switch connector.
  2. Use the test lamp in order to backprobe the hazard switch connector between terminal K and ground.
  3. Turn the hazard lights on.
  4. Turn the left turn signal on.

Does the test lamp flash?

--

Go to Step 9

Go to Step 10

6

Repair the open in CKT 150 between the hazard switch and ground splice pack G201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Repair the open in CKT 739 between the left IP junction block and the hazard switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

8

Replace the left IP junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

9

Replace the hazard switch. Refer to Hazard Flasher Switch Replacement in Instrument Panel, Gauges, and Console.

Is the repair complete?

--

Go to Exterior Lights System Check

--

10

  1. Use the test lamp in order to backprobe the turn/headlamp switch assembly connector C2 between terminal D and ground.
  2. Leave the hazard lamps and the left turn signal on.

Does the test lamp flash?

--

Go to Step 11

Go to Step 12

11

Repair the open in CKT 16 between the hazard switch and the turn/headlamp switch assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

12

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

Is the repair complete?

--

Go to Exterior Lights System Check

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