No voltage on power rail V1 V2 V3
â–¶ How to fix
Check the power supply and connectors to TCC. Check the fuse. Check if other systems have similar DTCs, that would indicate a general problem in the vehicle.
What you'll see
Toilet functionality is limited or completely missing.
System reaction
The DCU signals 'Major fault' over CAN to MBS, which then requests 'TCC malfunction' notification and an exclamation mark indication in the related TCC in Bus stop page in ICL.
Diagnostic depth
Detection
The DCU has detected that the voltage of power rail V1 or V2 or V3 is below 12V for at least 2 seconds.
Possible cause
The reasons could be: - a fuse for the TCC in the electric centre is blown - unplugged connectors - damaged cable harness - faulty or drained batteries