Hello,
It depends on the specific circuit configuration, so a circuit diagram is very helpful in each case to determine what is going wrong.
In the first case, the potential at the corresponding measurement point is +12V or there is no signal; in the latter case, it is at ground potential.
Open circuit/Short circuit to positive: Often caused by corroded or broken wires, loose connectors, or damaged insulation that creates a short circuit to the positive terminal.
Short circuit to ground: This is often caused by damaged cable insulation that is rubbing against the vehicle's body (ground, 0V), or by a faulty sensor that has an internal short circuit.
Best regards, Rainer.
Translated on 28-08-2026, 14:55.
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