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.
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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. |
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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:
Problem symptoms table
POWER WINDOW CONTROL SYSTEM (W/ JAM PROTECTION)
Symptom
Suspected Area
AUTO UP/DOWN function does not operate
Power window regulator motor assembly (Driver side)
Wire harness
Power window regulator master switch assembly
Remote ...
Road test
1. PROBLEM SYMPTOM CONFIRMATION
HINT:
The dynamic laser cruise control system has two cruise
control modes: the constant speed control mode and
vehicle-to-vehicle distance control mode.
The vehicle-to-vehicle distance control mode is
always selected when starting up the dynamic laser ...
Removal
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
2. DRAIN ENGINE COOLANT
3. REMOVE FRONT WIPER ARM HEAD CAP (See page
WW-4)
4. REMOVE FRONT WIPER ARM RH (See page WW-4)
5. REMOVE FRONT WIPER ARM LH (See page WW-4)
6. REMOVE COWL TOP VENTILATOR LOUVER SUBASSEMBLY
(See page WW-4)
7. REMOVE ...
