As per the title
I have a constant beep from parking sensors until I drive off. There is no errors on the dash or when I plug in my bt iid controller no faults whatsoever. Where do you start when it shows no errors? Any help would be appreciated.D3 HSE
7th May 2018 7:21 pm
SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
Look at the live data on iid when you put it in reverse. One (or more) of the sensors will show a shorter distance than the rest when you aren’t near anything. That sensor (or the loom to it), will be at fault
Regards
Steve
7th May 2018 7:36 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
Fronts faulty
7th May 2018 9:49 pm
Beno2
Member Since: 18 Apr 2009
Location: SE
Posts: 987
It beeps if in drive or reverseD3 HSE
7th May 2018 9:56 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
SteveNorman wrote:
Look at the live data on iid when you put it in reverse. One (or more) of the sensors will show a shorter distance than the rest when you aren’t near anything. That sensor (or the loom to it), will be at fault
Regards
Steve
Hi Steve,
On my quest to find similar the cause of similar issues, I’ve found that when the parking aid system errors out and starts flashing, the live values only show 2.5m and nothing else, no matter what the distance actually is.
How do you get the sensors to read when the system has failed?
Thanks
Andy
8th May 2018 3:17 pm
SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
Let it fault, with the light flashing, then re-read the fault codes. There should be one stored.
8th May 2018 4:43 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
At the moment I'm getting
Quote:
Parking Aid
B1B57-11 (2F) Front sensors power circuit - General electrical failure - circuit short to ground
B1B58-11 (2F) Rear sensors power circuit - General electrical failure - circuit short to ground
So doesn't give specific sensor, annoyingly.
Thats why I was wondering about the live values, but they all read 2.5m.
Andy
9th May 2018 8:56 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
duplicate post ... deleted.
9th May 2018 8:57 pm
SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
Check fuse 36 behind the glovebox just in case.
As the power supply circuit to front & rears fault at the same time and they are on different wiring, the likelihood is you either have an ecu faulty internally (found behind the passenger side rear panel, (just behind the rear passenger side door opening). Or if not, you are unlucky enough to have both looms to the sensors playing up. (unlikely).
If you have a spare unit you can swap the ecu & try.
regards
Steve
10th May 2018 6:18 am
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
Disconnected the front loom, edited the CCF file to set rear only, and works a charm.
Resistance across live and ground on the front loom is just 40Ω, and if I measure across the new sensor I removed because it didn’t work, it is 120Ω.
My guess is that this is way too low, and when powered the new sensors I have installed have blown so,etching internally and shorted out. Bad caps perhaps?
10th May 2018 8:27 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
when you say you measured the front loom, was it still connected to the car by the headlight at the time ?
10th May 2018 12:17 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
Nope.
Disconnected.
Then measured the resistance across live and ground with the sensors still plugged in via the disconnected headlight plug. In order for rear sensors to work solo, seems front sensors must be disconnected
I’ve now taken them out (supplier wants them back to refund rather than replace) and it was a single sensor that was causing the drop.
With it removed, the other three were sitting at 600 ohms.
Will take a closer look, but guess that’s why it was reporting short to ground.
Seems these sensors fail once voltage applied, and short out internally.
10th May 2018 3:56 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
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