Rear sensor behind passenger rear seat

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My Name: fraz101

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Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

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Just picked up a 2002 C3 HDI exclusive.

It has an alarm with ultrasonics in the front

But i'm wondering what the sensor behind the passenger rear seat is for?

I'm guessing it it part of the alarm system?
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fraz101 wrote:Just picked up a 2002 C3 HDI exclusive.

It has an alarm with ultrasonics in the front

But i'm wondering what the sensor behind the passenger rear seat is for?

I'm guessing it it part of the alarm system?
Hi fraz101, welcome to the forum.

Can you take a picture of the item and attach it to a reply please?

There are only sensors at the front of the car for the Alarm system.
My Name: fraz101

Contributor
Posts: 23
Joined: Tue May 12, 2015 11:20 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

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Looks like a little speaker
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My Name: C3CAR

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Posts: 2707
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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fraz101 wrote:Looks like a little speaker

Image
Its not a standard Citroen part. Looks like something added by a previous owner.

Maybe it is a little speaker?


The wire looks like its blocking the long hole which is used to stow the seat belt buckle when the seats are down.
My Name: fraz101

Contributor
Posts: 23
Joined: Tue May 12, 2015 11:20 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

I've figured it out

It's an aftermarket parking sensor speaker.

It doesn't have sensors attached to the rear bumper though

It has a strip stick to the back of the bumper?

Weird
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My Name: C3CAR

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Posts: 2707
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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fraz101 wrote:It has a strip stick to the back of the bumper?
Sounds like an electromagnetic strip, they don't need holes drilled like the ultrasonic parking sensors do.
My Name: fraz101

Contributor
Posts: 23
Joined: Tue May 12, 2015 11:20 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

I've just had a look underneath the rear bumper.That's exactly what it is.

The small control unit behind the bumper must be faulty as it's not working at all.
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My Name: C3CAR

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Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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fraz101 wrote:I've just had a look underneath the rear bumper.That's exactly what it is.

The small control unit behind the bumper must be faulty as it's not working at all.
They can be very cheap to buy. Its probably even cheaper to get the whole kit, than just a control box.

Have a look at these ebay listings for new ones to see what I mean about cheap ;) . maybe that is why yours failed, or maybe it was installed incorrectly?
My Name: fraz101

Contributor
Posts: 23
Joined: Tue May 12, 2015 11:20 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 80000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

I've just bought it yesterday and wondered what it was.

I'm not that bothered about parking sensors tbh,just thought I'd investigate to see what it was.

Thanks for the info though!!
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My Name: C3CAR

Guru
Posts: 2707
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 186 times
Been thanked: 101 times

Post

fraz101 wrote:I've just bought it yesterday and wondered what it was.

I'm not that bothered about parking sensors tbh,just thought I'd investigate to see what it was.

Thanks for the info though!!
No problem, enjoy driving your C3 :)
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