ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C1249/49: Open in Stop Light Switch Circuit

DTC C1249/49 - Open in Stop Light Switch Circuit

DESCRIPTION

The skid control ECU inputs the stop light switch signal and detects the status of the brake operation.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK STOP LIGHT SWITCH OPERATION
(a) Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.
OK:





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

NG -- INSPECT FUSE (STOP)
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Measure the voltage.
Standard Voltage:





(c) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are detected.





B -- END
A -- REPLACE BRAKE ACTUATOR
4. INSPECT FUSE (STOP)





(a) Remove the STOP fuse from the engine room R/B and J/B.
(b) Measure the resistance of the STOP fuse.
Standard Resistance:
Below 1 Ohms
(c) Reinstall the STOP fuse.
NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
5. INSPECT STOP LIGHT SWITCH ASSEMBLY





(a) Disconnect the stop light switch connector.
(b) Measure the resistance.
Standard Resistance:





(c) Reconnect the stop light switch connector.
NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU)





(a) Disconnect the skid control ECU connector.
(b) Disconnect the stop light switch connector.
(c) Measure the resistance.
Standard Resistance:





(d) Reconnect the stop light switch connector.
(e) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are detected.





B -- END
A -- REPLACE BRAKE ACTUATOR