17 · Electrical

Rear buzzer operation check

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Special accessories › Rear buzzer operation check

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Electrical equipmentRear buzzer operation check

REAR BUZZER OPERATION CHECK

Check 5580HD

1.9 JTS, 2.2 JTS, 3.2 JTS, 1.9 JTD 8V, 1.9 JTD 16V, 2.4 JTD 20V

the readings are subject to a tolerance of about 25%

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	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.	Replace buzzer
2	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.
3	Rear buzzer positive power supply check With the key on and reverse gear engaged and the Examiner in voltmeter mode Connect between pin 4 of connector AB of the parking control unit and earth Check that there is a presence of 12 Volt	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.
4	Check rear buzzer signal Turn the key on and engage reverse gear 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 3 of connector AB 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.
5	Check buzzer operation Check that the buzzer is working properly in the presence of the buzzer activation signal and the positive power supply	Replace buzzer

‹ Prev Check the operation of the parking sensor disablement button Next › Front buzzer operation check

Parts & tools for this job Staging For 2005 Alfa Romeo 159

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