P1571

: DTC P1571: BRAKE ON/OFF SWITCH, BRAKE CANCEL SWITCH MALFUNCTION

G240073t15 : CHECK THE POWER SUPPLY TO THE BRAKE CANCEL SWITCH
1. Disconnect the brake cancel switch electrical connector, CR77.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between CR77, pin 01 (WG) and GROUND.

- Is the voltage greater than 10 volts?

-> Yes

-> No
REPAIR the circuit between the brake cancel switch and battery. This circuit includes the passenger junction fuse box, (fuse 01). CLEAR the DTC. TEST the system for normal operation.

G240073t20 : CHECK THE BRAKE CANCEL SWITCH TO ECM CIRCUIT FOR HIGH RESISTANCE
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Measure the resistance between CR77, pin 02 (U) and PI01, pin 09 (U).

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G240073t16 : CHECK THE BRAKE CANCEL SWITCH TO ECM CIRCUIT FOR SHORT TO B+
1. Reconnect the battery negative terminal.
2. Measure the voltage between CR77, pin 02 (U) and GROUND.

- Is the voltage greater than 3 volts?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G240073t21 : CHECK THE BRAKE CANCEL SWITCH TO ECM CIRCUIT FOR SHORT TO GROUND
1. Measure the resistance between CR77, pin 02 (U) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No
INSTALL a new brake switch assembly. CLEAR the DTC. TEST the system for normal operation.