Stop Light Switch Circuit Malfunction

CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: P0571: 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.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK BRK RELAY





(a) Remove the BRK relay from the Relay Block No. 6.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





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






NG -- REPLACE BRK RELAY
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (BRK RELAY - BATTERY)
(a) Disconnect the connector from the Relay Block No. 6.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (BRK RELAY - SKID CONTROL ECU)





(a) Disconnect the S3 connector from the skid control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY