G545309P2: Brake Switch
PINPOINT TEST G545309p2: BRAKE SWITCHG545309t3: CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL RELEASED)
1. Key off.
2. Disconnect the brake switch electrical connector, CA142.
3. Ensure the brake pedal is not pressed.
4. Measure the resistance between:
Brake switch connector CA142, pin 01, component side
Brake switch connector CA142, pin 04, component side
^ Is the resistance greater than 10 ohms?
-> Yes
GO to Pinpoint Test G545309t4.
-> No
INSTALL a new brake switch. Speed Control Deactivator Switch (19.75.20) CLEAR the DTC, test the system for normal operation.
G545309t4: CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL PRESSED)
1. Press the brake pedal.
2. Measure the resistance between:
Brake switch connector CA142, pin 01, component side
Brake switch connector CA142, pin 04, component side
^ Is the resistance greater than 10 ohms?
-> Yes
INSTALL a new brake switch. Speed Control Deactivator Switch CLEAR the DTC, test the system for normal operation.
-> No
GO to Pinpoint Test G545309t5.
G545309t5: CHECK THE POWER SUPPLY TO THE BRAKE PEDAL SWITCH
1. Key on, engine off.
2. Measure the voltage between:
Brake switch connector CA142, pin 01
Battery, NEGATIVE terminal
^ Is the voltage less than 10 volts?
-> Yes
REPAIR the circuit between the brake switch and battery. This circuit includes fuse 8 of the Central Junction Box (CJB).
-> No
GO to Pinpoint Test G545309t6.
G545309t6: CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:
Brake switch connector CA142, pin 04
Battery, NEGATIVE terminal
^ Is the resistance less than 100K ohms?
-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.
-> No
GO to Pinpoint Test G545309t7.
G545309t7: CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:
Brake switch connector CA142, pin 04
Battery, POSITIVE terminal
^ Is the resistance less than 100K ohms?
-> Yes
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.
-> No
GO to Pinpoint Test G545309t8.
G545309t8: CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, FL072.
2. Measure the resistance between:
Brake switch connector CA142, pin 04
ECM connector FL072, pin 41
^ Is the resistance less than 10 ohms?
-> Yes
No fault is indicated with the brake switch or circuit. Check the integrity of all connections and TEST the system for normal operation.
-> No
REPAIR the high resistance circuit. TEST the system for normal operation.