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

  1. Turn ON the ignition, with the engine OFF.
  2. Press and release the brake pedal.
  3. Observe the stop lamps.

Are the stop lamps illuminated?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

3

Using a scan tool, observe the BPPS Sensor Voltage parameter.

Does the scan tool indicate more than 1 volt?

Go to Step 4

Go to Step 5

4

  1. Recalibrate the brake pedal position sensor. Refer to Brake Pedal Position Sensor Calibration .
  2. Press and release the brake pedal.
  3. Observe the BPPS Sensor Voltage parameter.

Does the scan tool indicate more than 1 volt?

Go to Step 6

Go to Step 9

5

Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 7

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6

Inspect for poor connections at the brake pedal position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 8

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7

Replace the BCM. Refer to Control Module References for BCM replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

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8

Important: A calibration of the Brake Pedal Position Sensor needs to be performed upon replacement. Refer to Brake Pedal Position Sensor Calibration .

Replace the brake pedal position sensor. Refer to Brake Pedal Position Sensor Replacement .

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2