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:
System description
1. MULTIPLEX COMMUNICATION SYSTEM (BEAN)
The BEAN communication line is used to control the
combination meter, the A/C amplifier, the airbag
sensor assembly, the multiplex network body ECU,
the power slide door ECU LH, the power slide door
ECU RH, the power back door ECU, the seat
posi ...
Random / Multiple Cylinder Misfire Detected
DESCRIPTION
When the engine misfires, high concentrations of hydrocarbons (HC) enter the
exhaust gas. High HC
concentration levels can cause increase in exhaust emission levels. Extremely
high concentrations of HC
can also cause increases in the Three-Way Catalytic Converter (TWC) tem ...
Precaution
Keep in mind the following points when inspecting the
dynamic laser cruise control system.
As there is a limitation on the vehicle-to-vehicle distance
controlling capability, do not overly rely on the dynamic
laser cruise control system.
Do not neglect to pay constant attentio ...
