Check rear buzzer impedance

• Connect the negative supply terminal for the Examiner to the vehicle earth

• Switch on the Examiner and set it to ohmmeter mode and calibrate, bypassing the probes

• Connect the leads (black and red probes) to the buzzer terminals without disconnecting it from the parking sensor control unit

The measurement should be about 51 Ohm which is the value for the buzzer impedance.

Check rear buzzer control line impedance

• Disconnect the buzzer connector

• Connect the ohmmeter to the connector terminals and measure a value of 230 Kohm which should be the system impedance

• Renew the wiring continuity between the parking control unit and the buzzer see wiring diagram

See E3090 PARKING SENSOR

• Replace the parking sensor control unit

Op. 5580H10 PARKING OBSTACLE DETECTION DEVICE ELECTRONIC CONTROL UNIT - R.R.

Check the buzzer positive power supply

• Place the key in the ON position

Press the parking sensor disablement button and ensure the led on the button comes on to indicate enablement.

With the Examiner in voltmeter mode.

• Connect between pin of parking sensor control unit connector LA and earth and ensure a voltage of 12 Volts is present

• Restore wiring continuity between the parking control unit and the buzzer

See E3090 PARKING SENSOR

• Replace the parking sensor control unit

Op. 5580H10 PARKING OBSTACLE DETECTION DEVICE ELECTRONIC CONTROL UNIT - R.R.

Check the buzzer signal

• Place the key in the ON position

Press the parking sensor disablement button and ensure the led on the button comes on to indicate enablement.

• With the Examiner in voltmeter mode, select an full scale deflection of 20 Volt and time base of 1 second

• Connect the red voltmeter probe to pin 2 of connector LA of the parking control unit and the black probe to earth

Get close to the rear sensors with the device working, check for the presence of the electrical signal.

Press the START button on the Examiner.

The image that appears should be similar to the one below

• Renew the wiring continuity between the parking control unit and the buzzer see wiring diagram

See E3090 PARKING SENSOR

• Replace the parking sensor control unit

Op. 5580H10 PARKING OBSTACLE DETECTION DEVICE ELECTRONIC CONTROL UNIT - R.R.

Check buzzer operation

Check that the buzzer is working properly in the presence of the buzzer activation signal and the positive power supply