Diagonal 1 and 2
â–¶ How to fix
- Check wiring and the relating electric connectors of front 3/2 solenoid valve FAB (short to UB ?) - Check wiring and the relating electric connectors of rear 3/2 solenoid valve DIF1 (short to UB ?) - Check wiring and the relating electric connectors of trailer 3/2 solenoid valve (short to UB ?) - Check wiring and the relating electric connectors of ESC supply line (short to UB ?) before ignition-on - Replace the ABS-ECU, if the fault is still active (this is the last thing to do !)
What you'll see
No driver-visible symptom recorded.
System reaction
ABS disabled ASR, ESC/RSC disabled DTC disabled Hillhold Function disabled
Diagnostic depth
Detection
mechanical system not responding properly or out of adjustment
Possible cause
Voltage supply axles 1+2+Dif, internal relay '1' does not open