GM Service Manual Online
For 1990-2009 cars only

Fog Lamp Switch Illumination Is Inoperative

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Interior Lights Dimming Diagnostic System Check

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Go to Step 2

Go To Interior Lights Dimming Diagnostic System Check

2

  1. Disconnect the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) connector.
  2. Connect a DMM between the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) connector terminal 7 and ground.
  3. Turn the headlamp switch to the PARK position.
  4. Measure the voltage at the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) connector terminal 7.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 3

Go to Step 8

3

  1. Disconnect the instrument cluster connector.
  2. Connect a DMM between the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) connector terminal 8 and the instrument cluster connector terminal B5.
  3. Measure for continuity in CKT 717 between the instrument cluster connector and the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) connector.

Is continuity present in CKT 717?

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Go to Step 5

Go to Step 4

4

Repair open in CKT 717.

Is the repair complete?

--

Go To Interior Lights Dimming Diagnostic System Check

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5

  1. Reconnect the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) connector.
  2. Move the headlamp switch to the PARK position.
  3. Connect a jumper wire (10 A) between the instrument cluster connector terminal B5 and ground.

Do the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) illumination lamps come ON?

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Go to Step 6

Go to Step 7

6

Replace the instrument cluster.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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7

Replace the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) illumination bulb.

Is the repair complete?

--

Go To Interior Lights Dimming Diagnostic System Check

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8

Are the electronic traction suspension control switch and the instrument cluster illumination lamps inoperative?

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Go to Step 9

Go to Step 10

9

Replace the headlamp switch.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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10

Repair the open in CKT 9.

Is the repair complete?

--

Go To Interior Lights Dimming Diagnostic System Check

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