ABS (Antilock Brake System)

ANTI-LOCK BRAKE SYSTEM: C1249/58: Stop Light Switch Circuit

DTC C1249/58 - Stop Light Switch Circuit

DESCRIPTION

This circuit recognizes brake operation by sending a stop light signal to the skid control ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK STOP LIGHT SWITCH OPERATION (STOP LIGHT SWITCH CIRCUIT)
(a) Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.
OK:





HINT: Check the stop light bulb as it may have burnt out.

NG -- INSPECT STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU CONNECTOR (STP TERMINAL)





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





NG -- CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU)
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
3. INSPECT STOP LIGHT SWITCH ASSEMBLY





(a) Disconnect the stop light switch assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU)





(a) Disconnect the stop light switch connector and skid control ECU connector.
(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