B2127

B2127 PARKING BRAKE SWITCH





Description
- Parking brake switch is installed on parking brake lever. It is turned ON when the parking brake is applied.
- The driver seat control unit judges that the parking brake is engaged if continuity exists in this circuit.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.STEP 1
1. Drive the vehicle at 7 km/h (4 MPH) or more.
2. Check "Self Diagnostic Result" using CONSULT-III.
Is the DTC detected?
YES - Perform diagnosis procedure. SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK PARKING BRAKE SWITCH SIGNAL
1. Turn ignition switch ON.
2. Select "PARK BRAKE SW" in the "Data Monitor" mode using CONSULT-III.
3. Check parking brake switch signal under the following condition.





Is the status normal?
YES - GO TO 5.
NO - GO TO 2.
2.CHECK PARKING BRAKE SWITCH INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect parking brake switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between parking brake switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - GO TO 3.
3.CHECK PARKING BRAKE SWITCH HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit connector and parking brake switch connector.
3. Check continuity between driver seat control unit harness connector and parking brake switch harness connector.





4. Check continuity between driver seat control unit harness connector and ground.





Is the inspection result normal?
YES - Replace driver seat control unit. Removal And Installation.
NO - Repair or replace harness.
4.CHECK PARKING BRAKE SWITCH
SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 5.
NO - Adjust or replace parking brake switch.
5.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END




Component Inspection
1.CHECK PARKING BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect parking brake switch connector.
3. Check continuity between parking brake switch terminal and ground part of parking brake switch.





Is the inspection result normal?
YES - INSPECTION END
NO - Adjust or replace parking brake switch.