Check Brake Pedal Stroke Sensor Circuit

PRE-CRASH SEAT BELT

Check Brake Pedal Stroke Sensor Circuit [B2453]

1.CHECK SELF-DIAGNOSTIC RESULT
With CONSULT-III
Select "SELF-DIAG RESULTS", and then make sure that "BR STROKE SEN CIRC" is displayed.

Without CONSULT-III
When CONSULT-III is not used, omit this inspection, and then GO TO 2.
Displayed B2453?
Yes - GO TO 3.
No - GO TO 2.
2.CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
With CONSULT-III
Select "B PEDAL SIG1" and "B PEDAL SIG2", and then make sure that the voltage changes synchronized with brake pedal operation.

B PEDAL SIG1
Brake released -> depressed: Approx. 1 -> 4V
B PEDAL SIG 2
Brake released -> depressed: Approx. 4 -> 1V

Without CONSULT-III
1. Turn ignition switch ON.

2. Check voltage between pre-crash seat belt control unit harness connector and ground.

OK or NG
OK - Brake pedal stroke sensor system is normal.
NG - GO TO 3.
3.CHECK BRAKE PEDAL STROKE SENSOR HARNESS
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit connector and brake pedal stroke sensor connector.

3. Check continuity between pre-crash seat belt control unit harness connector and brake pedal stroke sensor harness connector.

4. Check continuity between pre-crash seat belt control unit harness connector and ground.

OK or NG
OK - GO TO 4.
NG - Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.
4.CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY
1. Connect pre-crash seat belt control unit connector.
2. Turn ignition switch ON.

3. Check voltage between pre-crash seat belt control unit harness connector and ground.

OK or NG
OK - GO TO 5.
NG - Replace pre-crash seat belt control unit.
5.CHECK BRAKE PEDAL STROKE SENSOR

Check continuity between brake pedal stroke sensor while performing brake operation.

OK or NG
OK - Check harness connection.
- If it is OK, replace pre-crash seat belt control unit.
- If it is NG, repair or replace malfunction part.
NG - Replace brake pedal stroke sensor.