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Parking/reverse Sensor


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#1 stadsy

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Posted 13 November 2013 - 07:52 PM

Hi everyone, I've got a 2004 C-Max manual 2.0d, which I love, but I'm having problems with the reverse sensor. The trouble is, it has stopped working, my Mrs usually drives it and she told me recently that she could just about hear the reverse alarm, but of course now it has stopped completely. I have wd40'd all connections, to the sensors, control module etc. The module says Ford on it. Reading other posts, it was mentioned about fuse 84, this has been checked and is fine. Reversing lights all work, and all wiring seems to be in order. Is there a way of checking the sensors? or have I missed something obvious. Just though I'd ask, before I bite the bullet and take it to a robbing thwaite. Help please.

Stadsy



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#2 jeebowhite

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Posted 14 November 2013 - 09:39 AM

Welcome to the family Paul

 

OK, so do you have reverse lights on at all?



#3 stadsy

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Posted 14 November 2013 - 10:12 AM

Hi,

Yes mate, all reverse lights work.



#4 jeebowhite

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Posted 14 November 2013 - 11:03 AM

OK so in that case I would suggest its a power / earth fault.

 

Can you track the wires down, you should have an earth cable that goes to the earth bolt in the boot area, and also the power cable that should split off from the reverse light wire? are they both there and secured?

 

Also, it could be the buzzer unit thats stopped working if the above is fine...



#5 stadsy

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Posted 14 November 2013 - 02:14 PM

Hello again,

Just checked all wires looking for an earth and there doesn't appear to be one in the boot area, or underneath. I had the ignition on with the car in reverse while I checked all wires, and discovered the sensors vibrating, which would suggest power supply is reaching them. Just removed sounder and connected it to my bike battery and it worked!!! The only earth would be where the sounder is bolted to the right side bodywork. Hmmm. Gonna bolt the sounder back in and check power supply to the sounder. This is cooking me.



#6 jeebowhite

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Posted 14 November 2013 - 03:50 PM

Sounds like everything should generally work. But the bolting to the bodywork should definately be there!



#7 stadsy

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Posted 14 November 2013 - 04:55 PM

Hi again,

It would appear that the reverse sounder I was checking, turned out to be the alarm horn!!! Hmmm big red face, the sounder for the reverse sensor was not working, I tried a speaker improv and it worked. Massive sense of relief, as my mrs tends to rely upon them. I ordered one for just over £8. Thanks for all your help, you did suggest the sounder this morning.



#8 jeebowhite

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Posted 14 November 2013 - 04:58 PM

Glad to be of service Paul :) a new buzzer for £8 isnt bad at all, even a temporary fix with a cheapo buzzer or a computer speaker at the moment is something that could get you by!



#9 1978danno9

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Posted 18 November 2013 - 01:27 PM

Hi, i have a C-Max 2005 2L Diesel Manual. Both the front and rear reverse sensors have stopped working, the front went first and then the rear recently. Also both the reverse lights are not working. I have been to Halfords over the weekend who have suggested that it could be the reverse switch? The parking sensor on the dash is highlighted as 'off' and does not change when pressed. Can any body please help?

 

Many thanks in advance



#10 Caiti

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Posted 12 December 2013 - 12:30 PM

Sorry I cannot help but have a problem with mine also 2004 1.6 diesel automatic.  Mine do not work when reversing but seem to beep randomly at other times e.g. when I go over a speed hump.  Hoping someone replies to your post.  In the meantime I think mine started to go wrong after I washed the car and there is something in the manual about not directing water spray at them

Caitriona



#11 jeebowhite

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Posted 12 December 2013 - 01:02 PM

Karen, apologies I have just seen this, I saw it before and seem to have forgotten to reply!

 

The reverse switch is a distinct possibility. If you put the car into reverse, do the reverse lights come on? if not / intermittant, then its most likely the reverse switch. It is a DIY job and there is a guide in the Focus section for replacing it yourself, but otherwise a garage could sort it.

 

Caiti, sounds like you might have had water ingress. are they aftermarket or OEM sensors?



#12 Caiti

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Posted 12 December 2013 - 07:34 PM

I believe they are OEM but have not had it from new

C



#13 jeebowhite

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Posted 13 December 2013 - 09:54 AM

do you have an on off switch on the dash for the rear sensors?




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