GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Ensure that the brake pedal is not depressed.

Do the stop lamps remain OFF?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Disconnect the stop lamp switch.

Do the stop lamps turn OFF?

Go to Step 4

Go to Step 5

4

Inspect the stop lamp switch adjustment. Refer to Stop Lamp Switch Adjustment .

Did you find and correct the condition?

Go to Step 7

Go to Step 6

5

Repair a short to battery positive voltage in the stop lamp switched circuit or the stop lamp supply voltage circuit. Refer to Wiring Repairs or to Connector Repairs .

Did you complete the repair?

Go to Step 7

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6

Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .

Did you complete the replacement?

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3