GM Service Manual Online
For 1990-2009 cars only

All Park Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Exterior Lighting Diagnostic System Check?

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Go to Step 2

Go to Exterior Lighting Diagnostic System Check

2

  1. Using a DMM, backprobe between connector C209 terminal Z and ground.
  2. Measure the available voltage at connector C209 terminal Z.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 6

Go to Step 3

3

Check the PKT/LP MiniFuse® #6 for an open.

Is the fuse open?

--

Go to Step 5

Go to Step 4

4

Repair an open in CKT 240.

Is the repair complete?

--

Go to Exterior Lighting Diagnostic System Check

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5

Repair a short to ground in CKT 240.

Is the repair complete?

--

Go to Exterior Lighting Diagnostic System Check

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6

  1. Using a DMM, backprobe between connector C209 terminal R and ground.
  2. Move the headlamp switch to the PARK position.
  3. Measure the available voltage at connector C209 terminal R.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 8

Go to Step 7

7

Replace the headlamp switch.

Is the repair complete?

--

Go to Exterior Lighting Diagnostic System Check

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8

  1. Connect a DMM between the underhood electrical center connector C2 terminal D11.
  2. Headlamp switch still in the PARK position.
  3. Measure the available voltage at the underhood electrical center connector C2 terminal D11.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 10

Go to Step 9

9

Repair a poor connection or an open in CKT 9 between the connector C209 terminal R and the underhood electrical center connector C3 terminal D11.

Is the repair complete?

--

Go to Exterior Lighting Diagnostic System Check

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10

Replace the underhood electrical center.

Is the repair complete?

--

Go to Exterior Lighting Diagnostic System Check

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