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Hi,

I am trying to install aftermarket rear parking sensors.
When I try to connect to the rear backlight to get power there are some serious warnings attached to the backlight wires (see pictures) not to connect any equipment using more the 10mA. (The rear parking sensors are using 20-80mA). I have seen so many instructions saying just to connect to the backlights. Do I dare? What could happen ? If not, any suggestions ?

 
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You could damage the wiring loom. Relaying it up is an excellent idea.
 

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Hi,

Sorry for dragging up an old thread, but I'm wondering the same myself - can I fit reversing sensors to my 508 which also carries the same 10ma warning.

As an electronics novice, I'm wondering can you point me in the direction of the right relay/ or offer me any further advice of how I could wire this up?

Thanks
 

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OK, so after a bit of digging, I found this:
12V RELAY for CISBO parking reversing sensor fitting for CANBUS car connection to ignition power source: Amazon.co.uk: Car & Motorbike
Am I right in thinking that this is what I need (The parking sensors are also CISBO)?

And am I also right in thinking that this has 3 'ins':
1) 12v +
2) 12v - (Taken from any 12v power source within the car)
3) A wire for attaching to the reversing lights which (although not carrying power all the time thereby protecting that circuit) flips the switch inside the relay to provide:

[OUT] 12v (+ & -) to the sensor unit?

Is this how it all works? :confused:

Thanks
 

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Yup, that's about right.
What relay does is "sync two different power circles". One power circle is you putting in reverse, where the power goes to the wire attached to the rear lamp, closing the circuit. To avoid loading the circuit with additional resistances (eg your parking sensors), you put a relay in. It has a separate power source, and its state depends on original circuit: when one is open, so is the other one. When one is closed, so is the other one (can be wired vice-versa, but that's not the point here).
So basically what it does is to monitor the original circuit, and when it activates, relay also activates the other circuit. When you close the 1st one, relay closes the 2nd one. Since sensors are loaded on 2nd circuit, relay only uses 1st circuit "as a flip-switch" to know when to open or close the 2nd circuit.

Maybe this sounds complicated, but it really is not.
 

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Retro fir for rear parking sensors to a 308 SW

I fitted some reversing sensors to my Honda a few years ago and posted on the Honda users forum exactly what I did did and how I did it with a few photos, I was hoping someone had done this on the Peugeot forum but I haven't found any but I hope someone can help with my queries, as I really miss this facility when reversing as I find the SW rear vision does have some blind spots.

I have read Blue Devil's notes and I see a relay is needed, can the live feed for this be picked up from the feed to the rear aux socket, has this relay been actually used or has someone used another make successfully, ( the loading worries me) and also does anyone have a wiring diagram ?

Finally is there a recommended place to install the sensors as I assume some part of the rear bumper assembly has to be drilled in order to fit them ( push in models ) .

A bit belt and braces approach but there's nothing worse than carving up the back of the car in the wrong places !

Any additional information would be greatly appreciated westmoors
 

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The kits usually come with a piece of paper instructions that have recommended measurements for the sensor positions albeit some do loose a lot if translated.

I have an early 307 Van/Can and connected the live directly to the reversing light feed but wouldn't know if this would be ok for the 308. The ground for the control box could go direct to any earth point so shouldn't need to go through a relay.

I would expect a circuit that can only supply an extra 10ma to be drawing virtually the same current as the fuse protecting it is rated at.
 

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Parking sensors

Hi, I've decided to go ahead and fit reversing sensors to my newly acquired 308 SW as I find the rear view quite restricted and these will be a great help to avoid shunting into something.

I did see the use of a relay is recommended and have ordered one of these as well as the kit and do not see too many problems other than the tapping into rear off side wiring loom as it looks very much as though it could be a major strip out of the trims on that side of the luggage area.

At present I have only looked at possibilities but the small removable cover on the right hand side of the rear area which when removed only contains an empty three bolt fixed plastic molding ( which I assume would be for the tool kit on a left hand drive build car ) and I wondered if this is a way of getting to the loom.

If anyone has retro fitted sensors to an SW I would love to hear their of experiences and how they picked up the reversing light circuit., many thanks for any replies received. westmoors.
 

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Hi, I've decided to go ahead and fit reversing sensors to my newly acquired 308 SW as I find the rear view quite restricted and these will be a great help to avoid shunting into something.

I did see the use of a relay is recommended and have ordered one of these as well as the kit and do not see too many problems other than the tapping into rear off side wiring loom as it looks very much as though it could be a major strip out of the trims on that side of the luggage area.

At present I have only looked at possibilities but the small removable cover on the right hand side of the rear area which when removed only contains an empty three bolt fixed plastic molding ( which I assume would be for the tool kit on a left hand drive build car ) and I wondered if this is a way of getting to the loom.

If anyone has retro fitted sensors to an SW I would love to hear their of experiences and how they picked up the reversing light circuit., many thanks for any replies received. westmoors.
Unable to advise as I need the same info, I intend to pick up the feed for the relay from the rear power socket and use the reverse light feed for the trigger, I have a torch in the right hand rear area.
 

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Hi,

I am trying to install aftermarket rear parking sensors.
When I try to connect to the rear backlight to get power there are some serious warnings attached to the backlight wires (see pictures) not to connect any equipment using more the 10mA. (The rear parking sensors are using 20-80mA). I have seen so many instructions saying just to connect to the backlights. Do I dare? What could happen ? If not, any suggestions ?

every relay is different but I have drawn you a simple diagram of a basic 12v relay like this one 12V 40A DC SPNO Automotive Relay | Maplin
 

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parking sensors

Hi nickCC Just an update on how far I have got, I messed around the right hand side of the car as the axillary socket is on that side but failed to check the reversing light, there isn't one it's a fog light ! this only has one (on the left of course because it is French ) so I wasted some time.
So I looked at the left side of the car, not much difference but the plastic tool rack in the locker is a little larger, held with three nuts but it is possible to get it out with a bit of a struggle so you are not taking off trims thank goodness.
This uncovers a large square hole and the loom is in there with sufficient slack to enable a connection to be made without much difficulty.

To identify the correct wire I removed the rear tail light assembly, and a word of warning, after the two screw retaining screws are removed you pull the assembly backwards to pull it off two locating pegs.

There is a small multi plug connection and the reversing wire is at one end of this , on my car it is orange. I simply used a volt meter with reverse gear selected and ign on to identify it.

I have not identified a route for the wiring yet but as the sensors should be fitted on the under bumper they will have to be brought inboard somewhere on the left side of the car. If you get to this stage and find a good way please let me know, I am just guessing that the control and relay will be located in the tool compartment and the tools transferred to the other side locker. With the power supply to the relay most likely run under the carpet in the boot. I intend at the moment to use an axillary plug into the socket rather than try and find and tap into the power cable until I am satisfied it all works. My parts have not arrived yet anyway, I hope you will have some tips. westmoors.
 

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Hi nickCC Just an update on how far I have got, I messed around the right hand side of the car as the axillary socket is on that side but failed to check the reversing light, there isn't one it's a fog light ! this only has one (on the left of course because it is French ) so I wasted some time.
So I looked at the left side of the car, not much difference but the plastic tool rack in the locker is a little larger, held with three nuts but it is possible to get it out with a bit of a struggle so you are not taking off trims thank goodness.
This uncovers a large square hole and the loom is in there with sufficient slack to enable a connection to be made without much difficulty.

To identify the correct wire I removed the rear tail light assembly, and a word of warning, after the two screw retaining screws are removed you pull the assembly backwards to pull it off two locating pegs.

There is a small multi plug connection and the reversing wire is at one end of this , on my car it is orange. I simply used a volt meter with reverse gear selected and ign on to identify it.

I have not identified a route for the wiring yet but as the sensors should be fitted on the under bumper they will have to be brought inboard somewhere on the left side of the car. If you get to this stage and find a good way please let me know, I am just guessing that the control and relay will be located in the tool compartment and the tools transferred to the other side locker. With the power supply to the relay most likely run under the carpet in the boot. I intend at the moment to use an axillary plug into the socket rather than try and find and tap into the power cable until I am satisfied it all works. My parts have not arrived yet anyway, I hope you will have some tips. westmoors.
Thanks for info, I need to order the relay so will be a week or two before I get around to fitting, I've had this kit for well over ten years but could never be bothered to fit before or my previous cars already had them fitted.
 

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rear parking sensors

Hi Nick. Well I started to fit the sensors, no problem fitting the actual sensors in the under bumper but finding a way into the luggage compartment is something the owner must decide on where to go for himself . With the reversing light being a single one and on the left side of the car it does dictate where you run the wires to some extent., although the sensor cables are just about long enough for the one furthest away to reach the box if it is located on either side of the car but do check.
I decided to make an entry in the centre of the floor just behind where the spare wheel is located, not ideal but far less of a struggle.

I chose the left side for the control box and relay and removed the plastic tool holder/plate in the side locker that is held on with three nuts, a bit of a fiddle to get it out like the one on the other side but it does come out.
The wiring loom on this side also has enough slack to enable you to strip back the loom isolate the orange wire to solder another wire onto it.

I found a socket to fit the aux , extended the wiring and at present the cable runs from the plug in the aux socket inside to the floor under the carpet in the luggage compartment to the left side and is tucked under the side trim before going underneath to the side locker.

It's still 'jury rigged' as they say until I am in a position to test that it works OK but one big problem is the display. The actual display on this kit (cheap and cheerful) is only supplied with an adhesive pad and if you want it anywhere around the dash you have a problem because the pad will not stick on any of the front surfaces of the dash or trims.

I have compromised , it is in the lowest centre space in the dash at present where I normally keep my glasses! it will stick in there, just. The cable is at present fed down the passenger side into the rear but there is plenty to spare if rerouting is needed.

The plastic plate was drilled and the wires passed through from the rear with control box stuck in the centre of it so all the controls are out of sight.And you can return the towing hook and the crank handle to their clips

Now awaiting the relay, I think up to now the time involved is about 4 hours but a lot of this was finding out first what was involved and how to go about doing it..

But not bad for an outlay of only £17 (if it works ) Ken
 

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I bought reversing sensers from ebay for 15 quid just connect it to the reverse lamp wiring very easy and works fine,dont forget to fit a in line fuse tho ps..its a 508 1.6 saloon
 

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Do I dare to fit rear parking sensors

Hi Mick P, I would be very interested to know did your kit have a display unit for the front of the car, and if so where did you fit it?

I have just bought a kit and the display unit is supplied with a double sided sticky pad but where to put it as the sticky pad will not adhere to the normal mottled black dash or the aluminum part of the central control unit.
I have put mine inside the top central aperture for the time being where I used to keep my glass case as inside this is the only surface that will take the pad and secure the display ! So at present it is all under review as where it is best to put anything and nothing is connected.

The wiring I had hoped to route down the side of the central console on the passenger side and by tucking it from view under the lower edge on the passenger side run it back to the boot area but have not found anything with which to secure the cable neatly . I had planned to cut tiny strips of Gorilla tale which they claim will stick to anything and hold it down at suitable points but even this refuses to stick on any of the black plastic surfaces, I would be very interested on your solution.

The idea of fitting a line fuse is an excellent idea as looking in the handbook it does not seem that the reversing light circuit is protected by a fuse, and if anyone goes the whole hog and fits a relay for supplying the power probably this should also be protected in this way. westmoors
 

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Hi Westmoors,i didn't buy the one with the display because I didn't want the extra cable all over the place ,mine just has the small bleeper that I have put behind the near side rear head rest so you cant see it
 
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