P0703

P0703-BRAKE SWITCH 2 PERFORMANCE

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

Theory of Operation

The Brake Pedal sensor information is a bussed message to the Powertrain Control Module (PCM) from the ABS module. The brake switch rationality checks both failure modes of the brake switch. The brake switch stuck on test checks for a high vehicle speed condition where the brake switch is unexpectedly depressed. The brake switch stuck off test checks for repeated vehicle stop maneuvers without the brake switch depressed.

- When Monitored:
Ignition on and battery voltage above 10.4 Volts.

- Set Condition:
When the Powertrain Control Module (PCM) recognizes Brake Switch voltage is not equal to the applied value at the PCM when Brake Switch is applied. This could be a normal condition. If this condition is seen repeatedly by the PCM the fault is set. Cruise will not work for the rest of the key cycle.





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

Diagnostic Test

1. ACTIVE DTC

NOTE: Diagnose any Communication DTCs before continuing.

1. Ignition on
2. With the scan tool, select View DTCs.

NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

Is the DTC Active or Pending at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test.

2. BRAKE SWITCH SENSOR CIRCUIT DTCS SET IN THE ABS MODULE

Are any Brake Pedal Sensor Circuit DTCs set in the ABS module?

Yes

- Diagnose the appropriate Brake Switch DTC in the ABS module. Testing and Inspection.

No

- Go To 3

3. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Antilock Brake Module (ABS) and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Replace and program the Powertrain Control Module. Powertrain Control Module - Removal.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.