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Toyota Sienna Service Manual: Stop Light Switch Circuit Malfunction

DTC P0571 Stop Light Switch Circuit Malfunction

DESCRIPTION

The ECM receives the brake demand signal from the distance control ECU and transmits it to the skid control ECU (brake actuator assembly).

The skid control ECU (brake actuator assembly) receives a signal from the ECM and operates the brake actuator.

The skid control ECU (brake actuator assembly) operates the brake actuator and illuminates the stop light by operating the BRK relay at the same time.

DTC No.

DTC Detection Condition

Trouble Area

P0571

This trouble code is output when the ECM detected the BRK relay error signal from the skid control ECU for 0.2 sec. or more while the dynamic cruise control is in operation.
  • BRK relay
  •  BRK relay circuit
  •  Skid control ECU

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK BRK RELAY

CHECK BRK RELAY

  1. Remove the BRK relay from the Relay Block No. 6.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

  1. Apply battery voltage between terminals 1 and 2.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

2 CHECK HARNESS AND CONNECTOR (BRK RELAY - BATTERY)

  1. Disconnect the connector from the Relay Block No. 6.
  2.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

 

3 CHECK HARNESS AND CONNECTOR (BRK RELAY - SKID CONTROL ECU)

CHECK HARNESS AND CONNECTOR (BRK RELAY - SKID CONTROL ECU)

  1. Disconnect the S3 connector from the skid control ECU.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

REPLACE BRAKE ACTUATOR ASSEMBLY

Brake Switch "A" Circuit
DTC P0571 Brake Switch "A" Circuit DESCRIPTION When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the crui ...

Control Module Performance
DTC P0607 Control Module Performance DESCRIPTION This DTC indicates a malfunction in the ECM. HINT: The ECM receives signals from each sensor to control all the functions of the cruise control w ...

Other materials:

Initialization
1. RESET SLIDING ROOF MOTOR If the AUTO operation function does not operate, reset the sliding roof motor using any of the following methods. Press the sliding roof switch on the TILT UP side and hold it until the sliding roof motor stops. Then release the switch and leave it untou ...

Data list / active test
1. DATA LIST HINT: Using the intelligent tester to read the DATA LIST allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered ...

Short in CAN Bus Lines
DESCRIPTION The CAN bus wires are considered to be shorted when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω. Symptom Trouble Area Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω. ...

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