DTC U0029-00 (VSA Control Unit)

DTC U0029-00 : CAN Communication Failure (Bus OFF)

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 9.6 - 16.5 V Operating Condition: Turn the vehicle to the ON mode, then wait 2 seconds or more.
Execution	Regular Diagnosis
Duration	About 2 seconds
DTC Type	1 drive cycle Brake system indicator (amber) on VSA indicator on
Fail Safe Action	Stop engine drag torque control function Stop TCS function Stop VSA function Stop agile handling assist function Stop hill start assist function Stop automatic brake hold control function Stop starting assist brake function* 1 Stop ACC function* 2 Stop CMBS function* 2 Stop drive away assist function Stop parking cooperation assist function* 3
Possible Cause	Open, Short to another line, or Poor connection between the VSA modulator-control unit and the other control units (F-CAN A_L, F-CAN A_H, F-CAN B_L, F-CAN B_H lines) Internal failure of another unit on F-CAN VSA modulator-control unit internal failure

*1: With auto idle stop system

*2: With ACC

*3: 9-speed A/T