DTC C0023-14

DTC C0023-14 : Brake Diag Circuit OFF Failure

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 10 V or more Operating Condition: Turn the vehicle to the ON mode and press the brake pedal for at least 2 seconds.
Execution	Regular Diagnosis
Duration	About 2 seconds
DTC Type	1 drive cycle Brake system indicator (amber) on
Fail Safe Action	Stop automatic brake hold control function Stop ACC function* 1 Stop CMBS function* 1
Possible Cause	Open between the VSA modulator-control unit and the brake light relay (BRAKE LAMP, BRK DIAG lines) Open between the brake light relay and the under-dash fuse/relay box (IG1 ECU RR(7.5A) line) Blown fuse (Under-dash fuse/relay box No. C9 (15 A)) Brake light relay failure VSA modulator-control unit internal failure

*1: With ACC