Member Since: 02 Feb 2015
Location: Norfolk
Posts: 76
Reversing sensors working but not working
Hi
I realised last week (with a bump...) that my reversing sensors have become unreliable.
When I select reverse and release the EPB, the system beeps and the dashboard light illuminates as usual. However, looking at the readings on my GAP IID I could see that only the Rear Left Inner was giving a reading and only from 0.8m and somewhat intermittently. The other 3 sensors only read from less than 0.3m.
I swopped out all 4 sensors for new Amazon Chinese cheap versions and get the same result. Next step was to change the PDC Module with a used one from eBay. Still exactly the same.
All 4 sensors click. So, not the sensors or the PDC?
I tested the resistance to the sensors and the voltage of the loom with the car in reverse. Not sure of the correct numbering for the pins but have put them in the table below. No idea if there is anything significant though....help please.
So....any ideas? My only remaining theory is that somehow the loom in the bumper is shorting between the wires and the PDC is getting back a "low" reading i.e. 1/3 or 1/4 strength and hence I get a weak readings as shown on the GAP with it somehow biased towards Inner Left.
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