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Reverse Lights & Oem Parking Sensors Not Working.


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#1 timbosghia

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Posted 22 October 2013 - 05:45 PM

Hi there,
I am new to this forum & having spent most of today on the net, I have decided this is the best focus forum about.
As the title says, I have OEM sensors fitted to my 2007 focus 1.8 Ghia tdci, which, along with the reverse lights have stopped working.
I have checked the bulb & fuse in the glovebox compartment.
I have checked for power at the switch, located on the top of the mtx75 gearbox, which is there, shorted the two wires in the connector together & still they don't' work!!
Is there another fuse or relay somewhere which could be faulty?

Cheers Tim.

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#2 Stoney871

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Posted 22 October 2013 - 05:54 PM

The reversing sensors require a signal from the reverse light loom in order to activate so I would say that the loom from the switch to the light is most probably the culprit.
There is a footwell fuse layout for your car under this post.

#3 timbosghia

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Posted 22 October 2013 - 07:25 PM

Thanks for the prompt reply.
I have power to the switch & have joined the two wires together & still they don't work. I would presume this would eliminate the fuse & switch & also it would seem that the electric mirrors are fed from this fuse(141) & they work fine.
Does the outgoing wire from the switch go to reversing lights or to the module which is located behind the osr trim panel?

#4 jeebowhite

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Posted 23 October 2013 - 03:51 PM

so you have shorted out the live wires at the gearbox switch and they still dont come to life?

 

It would suggest either a possible bad earth for that area, or perhaps a bad wire going into the reverse switch?



#5 timbosghia

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Posted 10 November 2013 - 02:46 PM

Well, finally it has stopped raining, so I have attempted to repair this.
I have discovered that if I remove the reverse light bulb, the sensors work correctly. I have swapped the holder with the fog light holder & it is OK in the foglight.
Thinking it must be a dodgy earth for the reverse lights, I bared a section of the earth wire (black wire) & connected that to a good earth.
Still they don't work.
So I tried linking the gearbox switch wires together & still no joy!
I have tried a new fuse & bulb as well.
All I can think of now, is that it is fault with a connection prior to the fuse box.
Any advice will be greatly appreciated.

Cheers Tim

#6 jeebowhite

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Posted 11 November 2013 - 11:45 AM

possibly... Although the signal is getting to the rear reverse light so I dont believe so.

 

If you disconnect the power for the reverse sensors, does everything else behave? I have to say it still sounds like a bad earth...



#7 Wildernis

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Posted 26 December 2013 - 09:40 PM

I have the same problem on an 05 plate.  As both failed at same time I thought it would probably be the switch on the gearbox???



#8 jeebowhite

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Posted 26 December 2013 - 10:00 PM

Switch is a strong candidate!



#9 south_bound

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Posted 31 December 2013 - 02:18 PM

Just to tag onto this thread, my reverse light, reverse sensors and automatic rear windscreen wiper are only coming on intermittently when I reverse.  To me this sounds like a dodgy connection at the reverse switch (corrosion?).  I have found the switch, which is accessible with the air box taken out but is still under the battery and difficult to fit my hand and get a grip to pull it out.  The Hayes Manual isn't very helpful on how to disconect - is it just a spade connector to pull straight out?  Any ideas on how to pull it out without breaking something - then I can clean it up and test.



#10 jeebowhite

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Posted 31 December 2013 - 03:06 PM

Apply sillicone lubricant and let it set in, but I believe its just a pull out connector.



#11 timbosghia

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Posted 31 December 2013 - 10:52 PM

Due to the bad weather & other commitments, I haven't had a chance to pursue this problem.
In answer to "v,s" question, the connector has little tabs you have to press in to release the connector.
I think I have eliminated the switch by joining the wires together at the switch connector & also a faulty earth by baring the earth wire from the reverse light bulb holder & connecting that to a good earth.
I was thinking that it could be a dodgy connection on the fuse box but have not had a chance to check it out yet, plus I cannot see how to remove the fuse box assembly.
If anybody got any other ideas, let me know!
Happy new year!! Cheers

#12 jeebowhite

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Posted 31 December 2013 - 11:14 PM

Strange, so the wires joined together turned the lights on?



#13 timbosghia

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Posted 31 December 2013 - 11:38 PM

No, the lights nor sensors do not work at all, even if I link the wires on the switch connector together.
The sensors will however work if I remove the bulb from the reverse lights!

#14 mick85

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Posted 31 December 2013 - 11:53 PM

Think u can do gem self test to test ur switch down to module think u hear a beep this will at least tell u which end problem on

#15 jeebowhite

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Posted 02 January 2014 - 01:33 PM

The switch is for user press buttons only, so yes, if you press and hold the rear demister as you start the car to electrics, it will enter this mode. Then you press the OEM Sensor switch and it should beep.

 

However, the fact that you get the thing working with the bulb removed, sounds like it could be either a bad earth, or a bad bulb holder. Check it for corrosion as a starting point.



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