C1249
C1249Description
The brake ECU inputs the stop lamp switch signal and the condition of brake operation.
The brake ECU has an open detection circuit, which outputs this DTC when detecting an open in the stop lamp input line while the stop lamp switch is OFF.
C1249:
Diagnosis Procedure
CAUTION:
When replacing the brake ECU, perform initialization of linear solenoid valve and calibration.
1.INSPECT STOP FUSE
1. Remove the stop fuse from the main body ECU.
2. Measure the resistance according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace stop fuse.
2.CHECK STOP LAMP OPERATION
1. Install the stop fuse.
2. Check that the stop lamp comes on when the brake pedal is depressed, and goes off when the brake pedal is released.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 7.
3.INSPECT BRAKE ECU (STP TERMINAL)
1. Disconnect the brake ECU connector.
2. Measure the voltage according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connector (STP circuit).
4.INSPECT BRAKE ECU (IG1 TERMINAL)
1. Turn the ignition switch ON.
2. Measure the voltage according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness or connector (IG1 circuit).
5.INSPECT BRAKE ECU (GND TERMINAL)
1. Turn the ignition switch OFF.
2. Disconnect the brake ECU connectors.
3. Measure the resistance according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness or connector (GND circuit).
6.RECONFIRM DTC
1. Reconnect the brake ECU connectors.
2. Clear the DTC.
3. Turn the ignition switch ON (READY).
4. Depress the brake pedal several times to test the stop lamp circuit.
5. Check if the same DTC is recorded.
Result:
NOTE:
If troubleshooting has been carried out according to the Problems Symptoms Table, refer back to the table and proceed to the next step.
A >> Check for intermittent problems (symptom simulation).
B >> Replace brake ECU.
7.INSPECT STOP LAMP SWITCH (POWER SOURCE TERMINAL)
1. Disconnect the stop lamp switch connector.
2. Measure the voltage according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace harness or connector (power source circuit).
8.INSPECT STOP LAMP SWITCH
Measure the resistance according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace stop lamp switch.
9.CHECK HARNESS AND CONNECTOR
1. Disconnect the brake ECU connector.
2. Measure the resistance according to the value(s) in the table below.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair or replace harness or connector.
10.RECONFIRM DTC
1. Reconnect the brake ECU connector and the stop lamp switch connector.
2. Clear the DTC.
3. Turn the ignition switch ON (READY).
4. Depress the brake pedal several times to test the stop lamp switch circuit.
5. Check if the same DTC is recorded.
Result:
NOTE:
If troubleshooting has been carried out according to the Problems Symptoms Table, refer back to the table and proceed to the next step.
A >> Inspect lighting system (stop lamp circuit).
B >> Replace brake ECU.
Special Repair Requirement
1.ZERO ADJUSTMENT FOR EACH SENSOR AND OFFSET LEANING FOR LINEAR SOLENOID VALVE
After erasing brake ECU memories, perform zero adjustment of following sensors and initialization of linear solenoid valve.
^ Steering angle sensor: BRC-9, "PERFORM ZERO POINT OF STEERING ANGLE SENSOR: Description". Testing and Inspection
^ Yaw rate/side/decel G sensor: BRC-8, "PERFORM ZERO POINT OF YAW RATE/SIDE/DECEL G SENSOR: Description". Testing and Inspection
^ Brake stroke sensor: BRC-9, "PERFORM ADJUSTMENT OF STROKE SENSOR: Description". Perform Adjustment of Stroke Sensor
^ Linear solenoid valve: BRC-7, "PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION: Description". Perform Initialization of Linear Solenoid Valve and Calibration
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