Diagonal 1 and 2
â–¶ How to fix
- Restart the ABS-ECU with Ignition OFF/ON - Check wires and connectors (LD-GND shorted to UB?) - Check wiring LD-GND of front 3/2 solenoid valve FAB (short to UB?) - Check wiring LD-GND of rear 3/2 solenoid valve DIF1 (short to UB?) - Check wiring LD-GND of trailer 3/2 solenoid valve (short to UB?) - Check wiring LD-GND of AUX1, AUX2, AUX3 and AUX4 (short to UB?) - 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
ASR Diff. Brake disabled ESC/RSC disabled Hillhold Function disabled
Diagnostic depth
Detection
voltage above normal or shorted high
Possible cause
Dif-OV (LD), Shorted to UB Detection