| STEP | CHECK TO BE PERFORMED | REMEDIAL ACTION IF THE CHECK IS NOT OK |
|---|
| 1 | Buzzer control signal checkTurn the key to the MAR positionEngage reverse gearPlace an obstacle in front of the rear sensors at a distance of approx. 50 cmConnect 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 buzzerOp. 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 |
| 2 | Sensor connection checkCheck correct connection of sensors to parking control unit See E3090 PARKING SENSOR Move on to Step 3 | Restore the correct connections |
| 3 | Sensor power supply checkCheck that the sensors are receiving the correct power supply from parking control unit See E3090 PARKING SENSOR Move on to Step 4 | Restore correct power supply |
| 4 | Check the parking control unit power supplyCheck 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 blowRestore power supply wiringIf the previous checks have not revealed any faults, replace the parking control unit |
