C5 (X7) Pyramid shaped sensor under floor near exhaust?

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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by GiveMeABreak »

Jay-Bruce wrote: 09 Apr 2023, 20:30 Definitely not that sensor, it's in totally the wrong place...
Wasn't thinking of the ESP Gyrometer / Accelerometer Jay, as that's in the front of the cabin gearbox binnacle.

I was thinking of this one:
pyramid b.PNG
Thought it might be an external housing to protect it - LDS Pressure Sensor:
LDS Pressure Sensor.PNG
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by bobins »

I can only find one picture of it in the workshop manual PDFs, it seems to be missing on the other pictures. This picture came from the 'Removing - refitting rear suspension' section.

Top right of picture.
Mystery Toblerone.
Mystery Toblerone.
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by MattBLancs »

GiveMeABreak wrote: 09 Apr 2023, 20:34 I did suspect somebody had mounted one of those aftermarket foot swipe sensors to open and raise the tailgate - but a coincidence if a few of you have it.
It's quite a way underneath, and doesn't work if so! (Mind you I get "beep, beep" + complete lack of electric opening + large sigh + heave the damn thing open manually more often than I'd like. Will have to do Marc's battery monitor thing modification that defers Economy Mode Active a bit longer at some point. )
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by MattBLancs »

bobins wrote: 09 Apr 2023, 20:58 I can only find one picture of it in the workshop manual PDFs, it seems to be missing on the other pictures. This picture came from the 'Removing - refitting rear suspension' section.

Top right of picture.

Image
Quite a slip up by the spies letting it be captured like that - yes that's the do-dar
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by bobins »

It's the wireless monitor for the girdle spring that's part of the turbo encabulator. To be honest - I thought they'd phased those out years ago :lol:
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by bobins »

Found another picture ! Car lift added for scale :-D
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by GiveMeABreak »

... and no David Bailey's amongst you lot either. There's no cable connected to it after all :spineyes:

:-D
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by bobins »

Curioser and curioser. I doubt if this anomaly is relevant, but it's not shown on this image with the engine options shown in the picture.
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by MattBLancs »

GiveMeABreak wrote: 09 Apr 2023, 21:16 ... and no David Bailey's amongst you lot either. There's no cable connected to it after all :spineyes:

:-D

Hey! I've already explained why I took terrible photos, I thought the car might sit in my head if I faffed about too long under there! :rofl2:

Pretty sure there's a wire on mine, in usual ribbed cable protection sleeving
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by GiveMeABreak »

It's probably something totally obvious like the spare wheel fixing bolt - and that pyramid is a cover to stop the bolt rusting or water getting into the boot.

It's just the sort of thing PSA would do - protect a poxy bolt whilst leaving the critical hydraulic pipes with as much protection as a belly dancer with a 'G' string.
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by MattBLancs »

GiveMeABreak wrote: 09 Apr 2023, 21:27 It's probably something totally obvious like the spare wheel fixing bolt - and that pyramid is a cover to stop the bolt rusting or water getting into the boot.
Sorry, off topic really, but whilst you've triggered a thought:

X7 Tourer, is there anything that holds the spare wheel down? Literally nothing but the lift up boot floor above on mine, seems odd!?!
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by bobins »

Nothing obvious.....
C5 spare wheel well
C5 spare wheel well
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by GiveMeABreak »

On your specific X7 Matt, you have the following:

Items (1) the Spare Wheel Fixing Plate and (2) Spare Wheel Support Fixing Bolt
matt wheel.PNG
It's what I was referring to earlier about the pyramid maybe being some protection if the bolt extends through the floor.

... and as Bobins has posted that part up - the white area in the centre of the round wheel moulding that he posted up would be where the parts above would be attached.
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by MattBLancs »

GiveMeABreak wrote: 09 Apr 2023, 21:39 On your specific X7 Matt, you have the following:

Items (1) the Spare Wheel Fixing Plate and (2) Spare Wheel Support Fixing Bolt

Image

It's what I was referring to earlier about the pyramid maybe being some protection if the bolt extends through the floor.

... and as Bobins has posted that part up - the white area in the centre of the round wheel moulding would be where the parts above would be attached.
Thanks Marc,

I'll say "not anymore I don't!" no sign of anything like that (looks familiar, my old C4 had the sliding base, plastic bolt type thing) no obvious fixing holes where that might have once resided either.

There are two brackets 180° apart on the sides of the well, but no obvious remnants of anything on those either. I have in mind my 406 Coupe which had a couple of nylon webbing straps that meet in a very feeble erm, one of these:
Bum bag buckle!
Bum bag buckle!
but nothing even like that on my X7
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Re: C5 (X7) Pyramid shaped sensor under floor near exhaust?

Post by GiveMeABreak »

I think you're referring to this lot, which is also supposed to be included when new for your vehicle:
matt wheel kit.PNG
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