Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL 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 bulbs as they may have burnt out.

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





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





(c) Reconnect the skid control ECU connector.





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- 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 MASTER CYLINDER SOLENOID
4. 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.
5. INSPECT STOP LIGHT CONTROL RELAY
(a) Remove the STOP LP CTRL relay from the engine room R/B and J/B.
(b) Measure the resistance.
Standard Resistance:





(c) Apply the battery voltage between terminals 1 (+) and 2 (-).
(d) Measure the resistance.
Standard Resistance:





(e) Reinstall the STOP LP CTRL relay.
NG -- REPLACE STOP LIGHT CONTROL RELAY
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)





(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 MASTER CYLINDER SOLENOID