GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Exterior Lights System Check?

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Go to Step 2

Go to Exterior Lights System Check

2

Do the rear combination lamps operate properly?

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Go to Step 3

Go to License and Tail Lamps Inoperative

3

Using a test lamp, backprobe cavity 2 of the license plate lamps to ground.

Does the test lamp illuminate?

--

Go to Step 4

Go to Step 5

4

Test the license plate lamps cavity 1 for ground.

Is the cavity properly grounded?

--

Go to Step 6

Go to Step 7

5

Repair the open in the GRN wire between SP450 and license plate lamps cavity 2. Refer to Wiring Repairs in Wiring Systems.

is the repair complete?

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Go to Exterior Lights System Check

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6

Replace the license plate lamp socket. Refer to Rear License Lamp Replacement in Lighting Systems.

Is the replacement complete?

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Go to Exterior Lights System Check

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7

Repair the ground to cavity 1 of the license plate lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

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