C5 Mk3 X7 Autobox Interlock Relay

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petef
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by petef » 24 May 2018, 16:49

Curiouser and curiouser. I have now bent these old bones sufficiently to look right behind the glove box in the search for more relays. Cannot find any, but did observe that when my wife pressed the brake pedal it rotates a round horizontal steel bar in the passenger footwell - presumably a consequence of RHD build in what is essentially a LHD bodyshell - to which is attached a lever which operates a switch. Seems to be spring loaded and when the brake pedal pressed it allows it to springs out a touch. This in turn seems to operate the interlock. Maybe I have got this all wrong and it is just the brake light switch, but cleaning it with Servisol switch cleaner/lubricant now results - however temporarily - in the interlock working every time. Maybe the relay/interlock design was changed at some point? - mine is an 09 car RP 11495.

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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by GiveMeABreak » 24 May 2018, 16:58

That is correct - it is the hangover from the RHD / LHD conversion and that is where the brake switch is located as you can see from the diagram (part 10).
X7 Brake Switch.PNG

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petef
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by petef » 11 Jun 2018, 18:29

Just to report a successful outcome.
The relay was where it was reported to be and exactly as shown in the pics in this thread ie right up behind the glove box and was a 5 pin 96 202 209 80 Cartier type. It was found and replaced by an auto electrician and all is well now. My problem is that I don't bend like I used to and couldn't for the life of me find it.

Peter

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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by Hell Razor5543 » 11 Jun 2018, 18:37

Great news. :D

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Paul-R
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by Paul-R » 11 Jun 2018, 19:52

petef wrote:
11 Jun 2018, 18:29
My problem is that I don't bend like I used to and couldn't for the life of me find it.
I feel your pain - literally!

Great news though.

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EDC5
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by EDC5 » 11 Jun 2018, 20:07

Glad you got it sorted!
It's interesting how the contacts in the relay fail despite the coil working correctly.

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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by milleplod » 12 Jun 2018, 16:43

petef wrote:
11 Jun 2018, 18:29
Just to report a successful outcome.
The relay was where it was reported to be and exactly as shown in the pics in this thread ie right up behind the glove box and was a 5 pin 96 202 209 80 Cartier type. It was found and replaced by an auto electrician and all is well now. My problem is that I don't bend like I used to and couldn't for the life of me find it.

Peter


Is there any carpet/plastic trim to remove to get at it? Or is it 'exposed', albeit a pig to find?! I'm going to have to sort mine out, its only working around 20% of the time, which is really, really winding me up now! :evil:

Pete

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petef
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by petef » 12 Jun 2018, 20:58

Just the trim under the glove box - two 90 degree twist clips. Ignore the first relay you find which will probably be a big green one. Apparently it's right up behind the glove box on lhs, but, as I said, I couldn't contort enough to see it. And being black any way, it surely must be difficult to spot. If it's any consolation the relay was only £7.50 and the auto-electrician charged £63 all in, which is probably less than a physiotherapist would charge to put your back right when you try it yourself.....

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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by milleplod » 12 Jun 2018, 21:48

petef wrote:
12 Jun 2018, 20:58
Just the trim under the glove box - two 90 degree twist clips. Ignore the first relay you find which will probably be a big green one. Apparently it's right up behind the glove box on lhs, but, as I said, I couldn't contort enough to see it. And being black any way, it surely must be difficult to spot. If it's any consolation the relay was only £7.50 and the auto-electrician charged £63 all in, which is probably less than a physiotherapist would charge to put your back right when you try it yourself.....


Thanks for the reply. I'll try to get down there at the weekend, bike-prang related aches and pains permitting! :lol:

Pete

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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by kegserv » 09 Sep 2018, 18:03

Hello - I'm new and had the same problem. Managed to fix it -- it was indeed the relay -- couldn't have traced it without this forum, so many thanks. It took me 4 hours to change though, as on my car the relay holder faces up and is totally inaccessible. Had to remove the glovebox (massive job) and even then it was a case of reaching fingers over the top of the holder, bending a clip away then eventually easing the relay out. If I could have released the holder from its mount it wouldl have been a lot easier, and may not have needed the glove box out, but I couldn't see how it released even with torch and mirror. I uploaded photo of relay holder. Relay plugs into top of the black holder, (behind the blue one) and is held in by a clip on top which has to be pushed sideways. Good luck.
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WP_20180909_16_08_20_Pro.jpg

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EDC5
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by EDC5 » 09 Sep 2018, 19:39

Thanks for the pic. I was lucky in that I was somehow able to dislodge the relay holder so I could rotate the assembly to pull the relay out.

There isn't much info on this fix so I hope that this thread will continue to help people with the same issue.

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petef
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by petef » 09 Sep 2018, 21:45

Glad that someone else has managed to find, remove and replace this relay, which, to me, had attained almost mythical status. No way could I find it. I can console myself with the fact that the auto electrician that did the job for me in the end was half my age and presumably twice as pliable when it came to the contortions involved in replacing it. He did it without removing the glovebox and several months on all is working well.

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EDC5
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Re: C5 Mk3 X7 Autobox Interlock Relay

Post by EDC5 » 09 Sep 2018, 21:57

^ Yeah, if it wasn't for the fact that the coil was still working in the relay allowing me locate it by sound and also by touch then I would have given up and just removed the interlock solenoid!