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. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK BRK RELAY
- Remove the BRK relay from the Relay Block No. 6.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
- Apply battery voltage between terminals 1 and 2.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
2 CHECK HARNESS AND CONNECTOR (BRK RELAY - BATTERY)
- Disconnect the connector from the Relay Block No. 6.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
3 CHECK HARNESS AND CONNECTOR (BRK RELAY - SKID CONTROL ECU)
- Disconnect the S3 connector from the skid control ECU.
- Measure the resistance according to the value(s) in the table below.
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:
Fuel pump shut off
system
To minimize the risk of fuel leakage when the engine stalls or
when an airbag inflates upon collision, the fuel pump shut off
system stops the supply of fuel to the engine.
Follow the procedure below to restart the engine after the system is
activated.
Vehicles without a smart key system
...
Diagnosis system
1. CHECK DLC3
(a) The vehicle's ECM uses the ISO 15765-4 for
communication. The terminal arrangement of the
DLC3 complies with SAE J1962 and matches the
ISO 15765-4 format.
HINT:
Connect the cable of the intelligent tester to the
DLC3, turn the ignition switch to the ON position
and atte ...
Cleaning and protecting
the vehicle exterior
Perform the following to protect the vehicle and maintain it in
prime condition:
Working from top to bottom, liberally apply water to the vehicle
body, wheel wells and underside of the vehicle to remove any dirt
and dust.
Wash the vehicle body using a sponge or soft cloth, such as a
cha ...
