GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that the stop lamps are always ON.

Does the system operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

3

Check for proper adjustment of the stop lamp switch. Refer to Stop Lamp Switch Adjustment .

Did the stop lamp switch adjustment procedure complete the repair?

Go to Step 7

Go to Step 4

4

Remove the stop lamp switch.

Did the stop lamps turn OFF?

Go to Step 6

Go to Step 5

5

Repair the short to voltage in the stop lamp supply voltage circuits. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 7

--

6

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

Did you complete the repair?

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