PINPOINT TEST G531332p42 : BRAKE SWITCH

Pinpoint Tests

PINPOINT TEST G531332p42 : BRAKE SWITCH

G531332t105 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL RELEASED)
1. Key off.
2. Disconnect the brake switch electrical connector, CR78.
3. Make sure the brake pedal is not pressed.
4. Measure the resistance between:

Brake switch connector Brake switch connector
CR78, component side CR78, component side
Pin 01 Pin 02

- Is the resistance greater than 10 ohms?

-> YES
GO to Pinpoint Test G531332t106.

-> NO
INSTALL a new brake switch. CLEAR the DTC, test the system for normal operation.

G531332t106 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL PRESSED)
1. Press the brake pedal.
2. Measure the resistance between:

Brake switch connector Brake switch connector
CR78, component side CR78, component side
Pin 01 Pin 02

- Is the resistance greater than 10 ohms?

-> YES
INSTALL a new brake switch. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t107.

G531332t107 : CHECK THE POWER SUPPLY TO THE BRAKE PEDAL SWITCH
1. Key on, engine off.
2. Measure the voltage between:

Brake switch connector Battery
CR78, harness side
Pin 01 Negative terminal

- Is the voltage less than 10 volts?

-> YES
REPAIR the circuit between the brake switch and battery. This circuit includes fuse 44 of the primary junction box. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t108.

G531332t108 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:

Brake switch connector Battery
CR78, harness side
Pin 02 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t109.

G531332t109 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Brake switch connector Battery
CR78, harness side
Pin 02 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t110.

G531332t110 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, EC300.
2. Measure the resistance between:

Brake switch connector ECM connector EC300,
CR78, harness side harness side
Pin 02 Pin 41

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> NO
REFER to the warranty policy and procedures manual if an ECM is suspect.