C13A3

PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM: C13A3/31,C13AB/33: Open or Short in Lock Switch Circuit


DESCRIPTION

When the electric parking brake switch is pushed to the lock side, a lock request signal is output to the parking brake ECU.





HINT
*: When auxiliary battery voltage is 11 V

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- If the electric parking brake ECU or electric parking brake actuator is replaced, perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Programming and Relearning.
- Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.
- The linked double contacts inside the electric parking brake switch may become unlinked (one is off, one is on) if the switch is halfway pushed/pulled. If this condition continues for 1 second or more, this DTC is output.

PROCEDURE

1. INSPECT ELECTRIC PARKING BRAKE SWITCH

(a) Remove the electric parking brake switch Removal.

(b) Measure the resistance according to the value(s) in the table below.





Standard resistance:





NG -- REPLACE ELECTRIC PARKING BRAKE SWITCH Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SWITCH - ECU AND BODY GROUND)

(a) Disconnect the L39 switch connector.

(b) Disconnect the S48 ECU connector.

(c) Measure the resistance according to the value(s) in the table below.





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CLEAR DTC

(a) Turn the power switch OFF.

(b) Securely connect the parking brake ECU connectors and install the electric parking brake switch.

(c) Connect the Techstream to the DLC3.

(d) Turn the power switch ON (IG) and the Techstream on.

(e) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

4. CHECK FOR DTC

(a) Turn the power switch OFF.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch ON (IG) and the Techstream on.

(d) Perform the electric parking brake switch lock control.

(e) Check for DTC.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE ELECTRIC PARKING BRAKE ECU Removal