According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the electric brake booster.
DTC Description
DTC
Freeze Frame
U12B5-00 CAN Communication Failure With VSA (CAN Ch2)
1.
DTC check (Electric brake booster):
DTC check (Electric brake booster)
?1.
Turn the vehicle to the ON mode.
?2.
Clear the DTC with the HDS.
?3.
Turn the vehicle to the OFF (LOCK) mode, then wait 5 seconds or more.
NOTE: Do not open and close the driver's door.
?4.
Turn the vehicle to the ON mode.
?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U12B5-00 CAN Communication Failure With VSA (CAN Ch2)
Is DTC indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Open wire check (EBB CAN H, EBB CAN L lines):
Open wire check (EBB CAN H, EBB CAN L lines)
?1.
Turn the vehicle to the OFF (LOCK) mode with driver's door open.
?2.
Wait for 3 minutes.
NOTE: Do not close the driver's door.
?3.
Disconnect the following connector.
Electric brake booster 26P connector
?4.
Disconnect the following connectors according to the detected DTC.
DTC
Connector
U12B5-00
VSA modulator-control unit 46P connector
?5.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Electric brake booster 26P connector: disconnected
Transmitting control unit connector(s) for indicated DTCs: disconnected
The EBB CAN H and EBB CAN L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, substitute or replace the correspond control unit.?
