Diagnostic Routine B

Diagnostic Routine B

Diagnostic Overview

P0504, P0572, P0573 OR P1703

Refer to Wiring Diagram Set 31 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Brake Switch .

DTC Fault Trigger Conditions






Pinpoint Test

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

1. CHECK THE OPERATION OF THE STOPLAMPS

1. Ignition ON.

2. Operate the stoplamps.

Do the stoplamps and high mounted stoplamp operate correctly?






2. CHECK THE STOPLAMP SWITCH (BOO1) AND CRUISE CONTROL DEACTIVATOR SWITCH (BOO2) PIDs (Parameter Identifications)

1. Using a scan tool, view PCM (Powertrain Control Module) PIDs (Parameter Identifications).

2. Using the table, monitor the PIDs (Parameter Identifications) BOO1 (stoplamp switch) and BOO2 (cruise control deactivator switch) while applying and releasing the brake pedal.





Do the PID (Parameter Identification) values agree with the brake pedal position?






3. CHECK THE STOPLAMP SWITCH CIRCUIT

1. Ignition OFF.

2. Disconnect PCM (Powertrain Control Module) C175B.

3. Ignition ON.

4. While applying the brake pedal, measure:





Is the voltage greater than 11 volts?






4. CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect: PCM (Powertrain Control Module) C175B.

3. While firmly applying and releasing the brake pedal, measure:





Is the resistance less than 3 ohms with the brake pedal released, and greater than 10,000 ohms with the brake pedal firmly applied?






5. CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN

1. Disconnect: BPP (Brake Pedal Position) Switch.

2. Measure:





Is the resistance less than 3 ohms?






6. CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND

1. Measure:





Is the resistance greater than 10,000 ohms?






7. CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN

1. Connect a fused jumper wire:





2. Measure:





Is the resistance less than 3 ohms?






8. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all PCM (Powertrain Control Module) connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the PCM (Powertrain Control Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?