GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Was the Exterior Lights System Check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

  1. Backprobe the stoplamp switch connector with a test lamp from cavity 1 to ground.
  2. Press the brake pedal

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

Repair the open in the GRN/WHT wire between the stoplamp switch and S400. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

4

Test for an open in the WHT/YEL wire between the junction block and the stoplamp switch.

Was an open found?

--

Go to Step 6

Go to Step 5

5

Replace or adjust the stoplamp switch. Refer to Stop Lamp Switch Replacement or to Stop Lamp Switch Adjustment in Hydraulic Brakes.

Is the repair complete?

--

Go to Exterior Lights System Check

--

6

Repair the open. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--