Fault Code 1

HF sender rear left Fault code - 1 -

- Short to ground
- may also be checked via menu 2 = sensors. In this case, HF sensor defective appears regardless of the wheel position if there is a ground fault.

- Disconnect the control unit plug and measure from PIN 18 to ground (approx. 5 kohm would be displayed if there is no ground fault). Check the entire line path between control unit plug and HF sensor according to the circuit diagram.

- Open circuit
- may also be checked via menu 2 = sensors. In this case, HF sensor defective appears regardless of wheel position if there is discontinuity.

- Open HF sensor connector on the wheel carrier. Check cable path for discontinuity from the socket of the combined connector to PIN 18 of the control unit plug. If it is not possible to determine any discontinuity, check whether ground is present at the pin of the combined connector. If both are OK, replace HF sensor.

- Signal improbable
- Continue HF sensor test via menu 2 = sensors. If HF sender rear left O.K.* (meaning HF sensor attenuated) appears during this test regardless of the wheel position, replace the HF sensor.