P1571

H : P1571. Brake On/Off Switch / Brake Cancel Switch Malfunction.

H1 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE ON/OFF SWITCH.
1. Disconnect the brake ON/OFF switch electrical connector, CA37.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between CA37, pin 1 (NR) and GROUND.

Is the voltage greater than 10 volts?

Yes
Goto H2

No
REPAIR the circuit between the brake ON/OFF switch electrical connector, CA37, pin 1 (NR) and the ignition switch.
This circuit includes the inertia switch , ignition relay, and the central junction fuse box.
For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

H2 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE ON/OFF SWITCH FOR SHORT CIRCUIT TO BATTERY
1. Turn the ignition switch to the OFF position.
2. Measure the voltage between CA37, pin 1 (NR) and GROUND.

Is the voltage greater than 1 volt?

Yes
Repair the short circuit. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

No
Goto H3

H3 : CHECK THE BRAKE ON/OFF SWITCH SIGNAL WIRE FOR CONTINUITY.
1. Disconnect the PCM electrical connector, PI01.
2. Measure the resistance between the PCM electrical connector, PI01, pin 8 (GO) and brake ON/OFF switch electrical connector CA37, pin 2 (GO).

Is the resistance less than 5 ohms?

Yes
Goto H4

No
REPAIR the circuit between the PCM electrical connector, PI01, pin 8 (GO) and brake ON/OFF switch electrical connector CA37, pin 2 (GO). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

H4 : CHECK THE SWITCH ACTION OF THE BRAKE ON/OFF SWITCH.
1. Measure the resistance between pins 1 and 2 of the brake ON/OFF switch, with the brake pedal at rest.

Is the switch open circuit?

Yes
Goto H5

No
INSTALL a new brake ON/OFF Switch. CLEAR the DTC. TEST the system for normal operation.

H5 : CHECK THE SWITCH ACTION OF THE BRAKE ON/OFF SWITCH.
1. Measure the resistance between pins 1 and 2 of the brake ON/OFF switch, with the brake pedal depressed.

Is the resistance less than 5 ohms?

Yes
Goto H6

No
INSTALL a new brake ON/OFF switch. CLEAR the DTC. TEST the system for normal operation.

H6 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE CANCEL SWITCH.
1. Disconnect the brake cancel switch electrical connector, CA36.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between CA36, pin 1 (WG) and GROUND.

Is the voltage greater than 10 volts?

Yes
Goto H7

No
REPAIR the circuit between the brake cancel switch electrical connector, CA36, pin 1 (WG) and the Ignition Switch.
This circuit includes the inertia switch, ignition relay, and the central junction fuse box.
For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

H7 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE CANCEL SWITCH FOR SHORT CIRCUIT TO BATTERY
1. Disconnect the brake cancel switch electrical connector, CA36.
2. Turn the ignition switch to the OFF position.
3. Measure the voltage between CA36, pin 1 (WG) and GROUND.

Is the voltage greater than 1 volt?

Yes
Repair the short circuit. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

No
Goto H8

H8 : CHECK THE BRAKE CANCEL SWITCH SIGNAL WIRE FOR CONTINUITY.
1. Disconnect the PCM electrical connector, PI01.
2. Measure the resistance between the PCM electrical connector, PI01, pin 9 (U) and brake cancel switch electrical connector CA36, pin 2 (U).

Is the resistance less than 5 ohms?

Yes
Goto H9

No
REPAIR the circuit between the PCM electrical connector, PI01, pin 9 (U) and brake cancel switch electrical connector CA36, pin 1 (U). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation

H9 : CHECK THE SWITCH ACTION OF THE BRAKE CANCEL SWITCH.
1. Measure the resistance between pins 1 and 2 of the brake cancel switch, with the brake pedal at rest.

Is the switch open circuit?

Yes
Goto H10

No
INSTALL a new brake cancel switch. CLEAR the DTC. TEST the system for normal operation.

H10 : CHECK THE SWITCH ACTION OF THE BRAKE CANCEL SWITCH.
1. Measure the resistance between pins 1 and 2 of the brake cancel switch, with the brake pedal depressed.

Is the resistance less than 5 ohms?

Yes
INSTALL a new PCM. CLEAR the DTC. TEST the system for normal operation.

No
INSTALL a new brake cancel switch. CLEAR the DTC. TEST the system for normal operation.