DTC C1120-14

DTC C1120-14 : Electric Parking Brake Switch Circuit Malfunction

NOTE

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the ABS, VSA, and brake system indicator (amber) come on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the ABS, VSA, and brake system indicator (amber) go off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to Troubleshoot the VSA System" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure	Basic Condition: 12 volt battery voltage 9 - 16 V Operating Condition: Turn the vehicle to the ON mode.
Execution	Regular Diagnosis
Duration	-
DTC Type	1 drive cycle Brake system indicator (amber) on
Fail Safe Action	Stop emergency brake function Stop manual operating function Stop automatic adjusting function
Possible Cause	Open, Short to ground, or Poor connection between the VSA modulator-control unit and the electric parking brake switch (SW1, SW2, SW3, SW4 lines) Electric parking brake switch failure VSA modulator-control unit internal failure