GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the RUN position.
  2. Ensure that the brake pedal is not depressed.

Do the stop lamps remain off?

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

Go to Step 3

3

Disconnect the stop lamp/tcc switch.

Do the stop lamps turn off?

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Go to Step 4

Go to Step 5

4

Replace the stop lamp/tcc switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the replacement?

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Go to Step 6

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5

Repair a short to battery voltage in the supply voltage circuit of the stop lamp. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 6

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6

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3