Testing the reverse sensor loom

GordyB · 12th October 2015, 07:25

Can someone confirm what I have done is correct.

Took the bumper off to try to cure the long beep. When in reverse I have 3 clicking sensors and one which does nothing. I expected to see a broken wire in the loom when I took it apart but it all looks good. So, I tested the voltage across the brown and black wires going to the sensor connector and got 12V.

Therefore, the live and ground to the sensor are OK and the sensor must be dead if it isn't clicking ?? I may still have a fault on the signal wire back into the car but so far this is all I can do until I get hold of a spare sensor?

Also, would one sensor failing cause the long beep.

It's an early 2001 car with the sounder under the back shelf

Thanks

denis · 12th October 2015, 09:50

Quote:

Originally Posted by GordyB

Can someone confirm what I have done is correct.

Took the bumper off to try to cure the long beep. When in reverse I have 3 clicking sensors and one which does nothing. I expected to see a broken wire in the loom when I took it apart but it all looks good. So, I tested the voltage across the brown and black wires going to the sensor connector and got 12V.

Therefore, the live and ground to the sensor are OK and the sensor must be dead if it isn't clicking ?? I may still have a fault on the signal wire back into the car but so far this is all I can do until I get hold of a spare sensor?

Also, would one sensor failing cause the long beep.

It's an early 2001 car with the sounder under the back shelf

Thanks

Don't want to lead you down the wrong path Gordy but assuming your reverse sensors are factory fit and not after market (you don't mention that) I had a problem with mine which was cured by changing the reversing switch on the manual gearbox. I did have intermittent reverse lights as part of the combined problem though so if they are OK on yours it may not be the way to go.

T-Cut · 12th October 2015, 16:09

The original harness is a notoriously poor construction. Maybe worth just checking that the taped over twisted joins in the wiring are in good nick. Maybe take them apart and solder the connections and cover with fresh heat shrink sleeve. It just eliminates a major cause of poor operation, so you may still need the new sensor.

There was a new harness scheme running recently. Maybe worth checking through the thread.

TC

12th October 2015, 07:25	#1
GordyB Gets stuck in ZT, ZT-T Join Date: Aug 2015 Location: Brigg Posts: 932 Thanks: 505 Thanked 313 Times in 160 Posts	Testing the reverse sensor loom Can someone confirm what I have done is correct. Took the bumper off to try to cure the long beep. When in reverse I have 3 clicking sensors and one which does nothing. I expected to see a broken wire in the loom when I took it apart but it all looks good. So, I tested the voltage across the brown and black wires going to the sensor connector and got 12V. Therefore, the live and ground to the sensor are OK and the sensor must be dead if it isn't clicking ?? I may still have a fault on the signal wire back into the car but so far this is all I can do until I get hold of a spare sensor? Also, would one sensor failing cause the long beep. It's an early 2001 car with the sounder under the back shelf Thanks

12th October 2015, 16:09	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,754 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The original harness is a notoriously poor construction. Maybe worth just checking that the taped over twisted joins in the wiring are in good nick. Maybe take them apart and solder the connections and cover with fresh heat shrink sleeve. It just eliminates a major cause of poor operation, so you may still need the new sensor. There was a new harness scheme running recently. Maybe worth checking through the thread. TC