GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was A Diagnostic System Check performed?

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Go to Step  2

Go to Diagnostic System Check - Lighting Systems

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 RUN position.

Does the test lamp light?

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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?

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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?

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System OK

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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?

--

System OK

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8

Replace the left IP junction block. Refer to Underhood Fuse Block Replacement in Wiring Systems.

Is the repair complete?

--

System OK

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9

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

Is the repair complete?

--

System OK

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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?

--

System OK

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12

Replace the turn/headlamp switch assembly. Refer to Multifunction Switch in Steering Column.

Is the repair complete?

--

System OK

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