GPEC

P1572-BRAKE PEDAL STUCK ON

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.

- Set Condition:
The PCM detects that the state of brake switch does not change as expected.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE
Turn the ignition on.
With the scan tool, monitor the states of Brake Signal 1 and Brake Signal 2 while pressing and releasing the brake pedal several times.
Do the states change from Pressed when the pedal is pressed to Not Pressed when the pedal is released?

Yes

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC

No

- Go to 2

2. (B15) BRAKE SIGNAL 1 CIRCUIT

Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) connector.
Using a 12 volt test light connected to 12 volts, check the (B15) Brake Signal 1 circuit in the Powertrain Control Module (PCM) harness connector while pressing and releasing the brake pedal several times.
Does the test light change from illuminated when the pedal is pressed to not illuminated when the pedal is released?

Yes

- Go to 3

No

- Go to 4

3. (B16) BRAKE SIGNAL 2 CIRCUIT

Turn the ignition on.
Using a 12 volt test light connected to ground, check the (B16) Brake Signal 2 circuit in the Powertrain Control Module (PCM) harness connector while pressing and releasing the brake pedal several times.
Does the test light change from illuminated when the pedal is pressed to not illuminated when the pedal is released?

Yes

- Go to 11

No

- Go to 7

4. (Z908) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Turn the ignition off.
Disconnect the Stop Lamp Switch connector.
Using a 12 volt test light connected to 12 volts, check the (Z908) Ground circuit in the Stop Lamp Switch harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go to 5

No

- Repair the (Z908) Ground circuit for an open circuit or high resistance.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

5. (B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (B15) Brake Signal 1 circuit in the Stop Lamp Switch harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 6

No

- Repair the (B15) Brake Signal 1 circuit for a short to ground.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

6. (B15) BRAKE SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE

Turn the ignition off.
Disconnect the Stop Lamp Switch connector.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the (F202) Fused Ignition Switch Output (Run-Start) circuit in the Stop Lamp Switch harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go to 8

No

- Repair the (F202) Fused Ignition Switch Output (Run-Start) circuit for an open circuit or high resistance.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

8. (B16) BRAKE SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

Measure the voltage of the (B16) Brake Signal 2 circuit in the Stop Lamp Switch harness connector.
Is there any voltage present?

Yes

- Repair the (B16) Brake Signal 2 circuit for a short to voltage.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Go to 9

9. (B16) BRAKE SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

Measure the resistance of the (B16) Brake Signal 2 circuit between the Stop Lamp Switch harness connector and the Powertrain Control Module (PCM) harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 10

No

- Repair the (B16) Brake Signal 2 circuit for an open circuit or high resistance.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

10. STOP LAMP SWITCH
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Replace the Stop Lamp Switch.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

11. POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test Ver. 1Powertrain Verification Test.