GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Ensure that the brake pedal is not depressed.

Do the stop lamps remain OFF?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

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. If necessary, readjust. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes.

Is the stop lamp switch adjusted properly?

Go to Step 6

Go to Step 7

5

Repair a short to battery positive voltage in the stop lamp switch signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 7

--

6

Replace the stop lamp switch and adjust. Refer to Stop Lamp Switch Replacement and Stop Lamp Switch Adjustment in Hydraulic Brakes.

Did you complete the replacement?

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2