B2453

Description

- It changes voltage according to brake pedal depressed amount and sends the signal to pre-crash seat belt control unit.
- There are 2 signals (brake pedal stroke sensor 1 and 2) sent from the brake pedal stroke sensor. Pre-crash seat belt control unit judges the stroke amount and the speed of the brake pedal according to the voltage of the signal sent by each side.
- It is installed to back of driver instrument panel (lower).


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.Turn ignition switch ON.
2.Check "Self-diagnostic result" with CONSULT.
Is DTC detected?
YES- .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL

1.Turn ignition switch ON.
2.Select "BRK PEDAL SNSR-1" and "BRK PEDAL SNSR-2" in "DATA MONITOR" mode with CONSULT.
3.Check "BRK PEDAL SNSR-1" and "BRK PEDAL SNSR-2" indication under the following conditions.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 2.

2. CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect brake pedal stroke sensor connector.
3.Check voltage between Brake pedal stroke sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 4.

3. CHECK BRAKE PEDAL STROKE SENSOR CIRCUIT

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





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





Is the inspection result normal?
YES- .
NO- Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.

4. CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY CIRCUIT

1.Disconnect pre-crash seat belt control unit (driver side) connector.
2.Check continuity between pre-crash seat belt control unit (driver side) harness connector and brake pedal stroke sensor harness connector.





3.Check continuity between pre-crash seat belt control unit (driver side) and ground.





Is the inspection result normal?
YES- Replace pre-crash seat belt control unit (driver side).
NO- Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.

5. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
- INSPECTION END


Component Inspection


COMPONENT PARTS INSPECTION


1. CHECK BRAKE PEDAL STROKE SENSOR

Check that continuity between brake pedal stroke sensor terminal 2 and terminals 1 and 3 is normal when performing the brake operation.





Is the inspection result normal?
YES- Brake pedal stroke sensor system is normal.
NO- Replace brake pedal stroke sensor.