Buzzer control signal check

Turn the key to the MAR position

Engage reverse gear

Place an obstacle in front of the rear sensors at a distance of approx. 50 cm

Connect an Examiner in Voltmeter mode with the positive probe at pin 2 and the negative probe at pin 1.

Press the START button on the Examiner. The figures in the image that appears must be evaluated with a tolerance of about 20%. They should in any case be similar to the graph in the diagram.

If the signal is present, replace the buzzer

Op. 5580H15

If interrupted, restore the continuity of the wiring between the parking sensor control unit and the buzzer.

If the wiring is OK and the control unit output signal is interrupted proceed to step 2

Sensor connection check

Check correct connection of sensors to parking control unit

See E3090 PARKING SENSOR

Move on to Step 3

Sensor power supply check

Check that the sensors are receiving the correct power supply from parking control unit

See E3090 PARKING SENSOR

Move on to Step 4

Check the parking control unit power supply

Check that the parking control unit is receiving the correct power supply

See E3090 PARKING SENSOR

Replace 25 A fuse F51 in the dashboard control unit, having ascertained what caused it to blow

Restore power supply wiring

If the previous checks have not revealed any faults, replace the parking control unit