Fan actuator (fanAct), short circuit high to ground
â–¶ How to fix
Check the actuator, connectors and wiring.
What you'll see
No driver-visible symptom recorded.
System reaction
If the fan is electrically controlled, it cannot be switched off. If the fan is hydraulically controlled, it will not work at all.
Diagnostic depth
Detection
Short circuit high to ground (U31) in the fan actuator (fanAct) circuit.
Possible cause
Connectors, wiring or actuator are faulty.