2009 b9 towbar

[Lingo09]

I know there are many topics on this.
But because of that i find it hard to find out.
Is there some plug and play wireset without much hassle. To fit the electric from the towbar?

If i buy a used original one with wires hanging on.
can i "plug and play" ?

Its a b9 berlingo multispace i have 2008 (2009 model)

I really need a towbar but it is too expensive/complicated if there is alot of wiring going on.

[Sol]

You cannot just wire it up to the rear lights, without the possibility of damaging the BSI. There is meant to be a towbar ECU installed. It has a socket for this.

[dr268]

I know there are many topics on this.
But because of that i find it hard to find out.
Is there some plug and play wireset without much hassle. To fit the electric from the towbar?

If i buy a used original one with wires hanging on.
can i "plug and play" ?

Its a b9 berlingo multispace i have 2008 (2009 model)

I really need a towbar but it is too expensive/complicated if there is alot of wiring going on.

its not too difficult just a bit time consuming doing it without the original wiring, why there isnt a simple plug and play connector in the boot is beyond me but it is French. 

the towbar bit is easy and can be done in your driveway with a couple of old fashioned car ramps

you need a permanent 12v supply to power a towbar bypass relay, look in the nearside rear panel of the boot, hopefully you will find a thick single wire with a connector on the end, it will more than likely be dead, if so you need to fit the 40amp maxi fuse below the ecu beside the battery. This powers the wire in the boot.

wire the towbar old school with scotch locks behind the lamp cluster and feed them via the bypass relay. and all should work fine

if you dont have the 12v feed wire in the boot (cant remember colour but its obvious) you will need to run a 12v permanent live from somewhere, preferably fused from the battery . as long as your not wiring in caravan electrics it doesn't need to be 40amp. 

i used a maypole bypass relay and a witter towbar for less than £200

[evdama]

I've a '12 plate van and wired my own tow bar on with an aftermarket relay from the rear lights.
13 years later everything still works just fine.

[Gryffindor]

The issue is that with CANBUS cars, after say 2009 I think, the BSI detects when bulbs fail by monitoring the power lines going to them. So if you just wire trailer bulbs into the same wires, it changes the readings the BSI sees and it throws a wobbly (think Mr Blobby type wobblies).
This is also why LED replacement bulbs often don't work - they also draw less power than standard bulbs so the BSI thinks there's still a problem. Even canbus friendly LED bulbs may not be.
The idea behind a bypass relay is that instead of directly connecting trailer lights to the car's lighting wires, you're only connecting relay contacts which take a tiny amount of power compared to light bulbs. The relay then feeds the permanent 12v others mention to the lights. This might be low enough for the BSI not to notice, or it might not. You'll find both stories reported here. But as Zion says it is not worth the gamble because the BSI might just faint and keel over.
The only proper DIY method is to use what Zion calls a towbar ECU - instead of a relay, you wire in a black box containing a microprocessor which talks to the BSI and tells it to calm down in a Scouse accent. But they are expensive.