GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Fog Lights System Check performed?

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Go to Step 2

Go to Fog Lights System Check

2

  1. Connect a scan tool to the data link connector (DLC).
  2. Inspect the IPC input: front fog lamps switch.

Does the front fog lamps switch operate properly?

--

Go to Step 3

Go to Step 7

3

  1. Turn the ignition switch to the RUN position.
  2. Remove the fog lamp relay from the underhood relay center.
  3. Measure the voltage to ground at the fog lamp relay connector terminal C6 (PNK) and terminal D6 (ORN).

Is battery voltage measured at both of the terminals?

--

Go to Step 4

Go to Step 10

4

  1. Turn the front fog lamp switch to the ON position.
  2. Measure the voltage between the fog lamp relay connector terminal C6 (PNK) and terminal D4 (DK GRN/WHT).

Is battery voltage measured?

--

Go to Step 5

Go to Step 11

5

Connect a fused jumper between the fog lamp relay connector terminal D6 (ORN) and terminal C4 (PPL).

Do the front fog lamps turn on?

--

Go to Step 6

Go to Step 12

6

Replace the fog lamp relay.

Is the fog lamp relay replacement complete?

--

Go to Fog Lights System Check

--

7

  1. Disconnect the headlamp switch connector C1.
  2. Connect a fused jumper between the headlamp switch connector C1 terminal G (ORN) and ground.

Is the IPC input: front fog lamps switch on?

--

Go to Step 8

Go to Step 9

8

Inspect CKT 151 (BLK/WHT) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 151 OK?

--

Go to Step 13

Go to Step 15

9

Repair the open in CKT 192 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

--

10

Repair the open in the following circuits:

    • CKT 439 (PNK)
    • CKT 1640 (ORN)

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

--

11

Inspect CKT 1317 (DK GRN/WHT) for an open. Refer to Testing for Continuity in Wiring Systems.

Is CKT 1317 OK?

--

Go to Step 14

Go to Step 15

12

Repair the open in CKT 34 (PPL) between S106 and the underhood relay center. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

--

13

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the headlamp switch replacement complete?

--

Go to Fog Lights System Check

--

14

Replace the body control module (PZM). Refer to Body Control Module Replacement in Body Control Systems.

Is the body control module replacement complete?

--

Go to Fog Lights System Check

--

15

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

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