P1571

I : P1571. BRAKE ON/OFF SWITCH / BRAKE CANCEL SWITCH MALFUNCTION

I1 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE ON/OFF SWITCH

1. Disconnect the brake ON/OFF switch electrical connector, PA3.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between PA3, pin 3 (NR) and GROUND.

Is the voltage greater than 10 volts?
Yes
Goto I2

No
REPAIR the circuit between the brake ON/OFF switch electrical connector, PA3, pin 3 (NR) and the ignition switch. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the inertia switch, ignition relay, and the central junction fuse box

I2 : 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 PA3, pin 3 (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 I3

I3 : CHECK THE BRAKE ON/OFF SWITCH SIGNAL WIRE FOR CONTINUITY

1. Disconnect the PCM electrical connector, EN16.
2. Measure the resistance between the PCM electrical connector, EN16, pin 8 (GO) and brake ON/OFF switch electrical connector PA3, pin 1 (GW).

Is the resistance less than 5 ohms?
Yes
Goto I4

No
REPAIR the circuit between the PCM electrical connector, EN16, pin 8 (GO) and brake ON/OFF switch electrical connector PA3, pin 1 (GW). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

I4 : CHECK THE SWITCH ACTION OF THE BRAKE ON/OFF SWITCH

1. Measure the resistance between pins 1 and 3 of the brake ON/OFF switch, with the brake pedal at rest.

Is the switch open circuit?
Yes
Goto I5

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

I5 : CHECK THE SWITCH ACTION OF THE BRAKE ON/OFF SWITCH

1. Measure the resistance between pins 1 and 3 of the brake ON/OFF switch, with the brake pedal depressed.

Is the resistance less than 5 ohms?
Yes
INSTALL a new PCM. Before replacing a PCM, contact Dealer technical support. CLEAR the DTC. TEST the system for normal operation.

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

I6 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE CANCEL SWITCH

1. Disconnect the brake cancel switch electrical connector, PA2.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between PA2, pin 2 (NR) and GROUND.

Is the voltage greater than 10 volts?
Yes
Goto I7

No
REPAIR the circuit between the brake cancel switch electrical connector, PA2, pin 2 (NR) and the Ignition Switch. For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the inertia switch, ignition relay, and the central junction fuse box

I7 : CHECK THE POWER SUPPLY CIRCUIT TO THE BRAKE CANCEL SWITCH FOR SHORT CIRCUIT TO BATTERY

1. Disconnect the brake cancel switch electrical connector, PA2.
2. Turn the ignition switch to the OFF position.
3. Measure the voltage between PA2, pin 2 (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 I8

I8 : CHECK THE BRAKE CANCEL SWITCH SIGNAL WIRE FOR CONTINUITY

1. Disconnect the PCM electrical connector, EN16.
2. Measure the resistance between the PCM electrical connector, EN16, pin 9 (U) and brake cancel switch electrical connector PA2, pin 1 (U).

Is the resistance less than 5 ohms?
Yes
Goto I9

No
REPAIR the circuit between the PCM electrical connector, EN16, pin 9 (U) and brake cancel switch electrical connector PA2, pin 1 (U). For additional information, refer to wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

I9 : 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 I10

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

I10 : 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. Before replacing a PCM, contact Dealer technical support. 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.