GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should only be used if the headlamp and the park lamp systems are functioning properly. If any faults are present with those systems, they must be repaired first.

1

Did you perform the Fog Lights System Check?

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Go to Step 2

Go to Fog Lights System Check

2

  1. Remove the fog lamp relay from the convenience center.
  2. Turn the ignition switch to the RUN position.
  3. Place the headlamp and panel dimmer switch in the PARK position.
  4. Press the fog lamp switch to the ON position.
  5. Connect a test lamp from the fog lamp relay, cavity G1, to ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 3

3

Backprobe the fog lamp switch connector with a test lamp from cavity B to ground.

Does the test lamp light?

--

Go to Step 10

Go to Step 4

4

Backprobe the fog lamp switch connector with a test lamp from cavity D to ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Repair the open in CKT 9 (BRN) between the fog lamp switch and S210. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

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6

Replace the fog lamp switch. Refer to Fog Lamp Switch Replacement .

Is the repair complete?

--

Go to Fog Lights System Check

--

7

Connect a test lamp from cavity G1 to cavity H3 of the fog lamp relay.

Does the test lamp light?

--

Go to Step 8

Go to Step 11

8

Connect a test lamp from fog lamp relay, cavity H1, to ground.

Does the test lamp light?

--

Go to Step 9

Go to Step 12

9

Connect a fuse jumper from cavity H1 to cavity G3 of the fog lamp relay.

Do the fog lamps light?

--

Go to Step 13

Go to Step 14

10

Repair the open in CKT 317 (YEL) between the fog lamp switch and the convenience center. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

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11

Repair the open in CKT 11 (LT GRN) between the fog lamp relay and S225. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

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12

Repair the open in CKT 340 (ORN) between the instrument panel fuse block and the convenience center. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

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13

Replace the fog lamp relay.

Is the repair complete?

--

Go to Fog Lights System Check

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14

Repair the open in CKT 34 (PPL) between the convenience center and splice S126. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Fog Lights System Check

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