P0573

P0573-BRAKE SWITCH 1 STUCK OFF





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
While the ignition is on.

- Set Condition:
The brake switch status is equal to on and the no brake switch status is equal to off for a calibrated amount of time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. CHECK THE BRAKE SWITCH CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Brake Switch connection. Inspect the pins and connector for damage, corrosion, etc.
3. Disconnect the PCM C2 harness connector. Inspect the pins and connector for damage, corrosion, etc.

NOTE: Check connectors - Clean/repair as necessary.

4. Measure the resistance of the Brake Switch signal circuits between the PCM C2 harness connector and the Brake Switch harness connector.

Is the resistance below 10.0 Ohms?

Yes

- Go To 2

No

- Repair the open Brake Switch circuits.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

2. CHECK THE BRAKE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage between the Brake Switch circuits in the PCM C2 harness connector and ground.

Is the voltage below 1.0 Volt?

Yes

- Go To 3

No

- Repair the short to voltage in the circuit.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

3. POWERTRAIN CONTROL MODULE
1. Reconnect the PCM C2 harness connector.
2. Install a jumper wire in the Brake Switch connector between signal circuit and ground.
3. Turn the ignition on.
4. Cycle the brake pedal several times.
5. Using the scan tool, read the DTCs.

Is the DTC for Brake Switch Low DTC present?

Yes

- Go To 4

No

- Replace the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

4. CHECK THE BRAKE SWITCH
1. Reconnect the Brake Switch connector.
2. Using the scan tool, clear the DTCs.
3. Turn the ignition on.
4. Cycle the brake pedal several times.
5. Using the scan tool, read the DTCs.

Has the Brake Switch High DTC returned?

Yes

- Replace the Brake Switch.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test