C1249

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.
The skid control ECU has an open detection circuit. If an open in the stop light switch input line or GND side stop light circuit is detected when the stop light switch is off, this DTC is output.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK STOP LIGHT SWITCH OPERATION
(a) Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.
HINT: Check the stop light bulb because it may be burnt out.

OK:
Stop light switch function is normal.
NG -- INSPECT STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
2. CHECK SKID CONTROL ECU CONNECTOR (STP VOLTAGE)





(a) Disconnect the S1 skid control ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






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





(a) Remove the stop light switch assembly.
(b) Measure the resistance of the stop light switch.
Standard resistance:






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





(a) Disconnect the S1 skid control ECU connector.
(b) Disconnect the stop light switch assembly connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






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