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      07-22-2020, 03:31 PM   #1
Easty29
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Drives: BMW 330d M Sport 2015
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Exclamation F31 Electric swivel tow bar retrofit

Hi all,

I wanted a towbar for my 2015 F31 330d M Sport LCI and having had an electric swivel tow bar in the past I decided to retro fit one. It was difficult to find one fitted as it seems a pretty rare option. I only want to use one to carry a bike rack as I don't like keeping them on the roof.

I searched through all of the forums here and found some really useful information. Most importantly the manufacturer retro fit instructions which are great. I bought a used swivel tow bar and module. I got a brand new OEM wiring loom which although a bit expensive for what it is it seems like good quality.

Once I had all the bits together I got round to fitting the part. Not too bad a job and bumper off, tow bar on. Heat shield modified and hole drilled next to the battery compartment it all seemed pretty normal. The wiring loom was fairly straight forward although I'm quiet a bit more comfortable with mechanics than electrics.

Everything went in as per the OEM instruction with a reassuring click on all of the connectors. Fuse box high was already installed and the mount for the module was already there too which saved a bit of extra work. Having completed the work there unfortunately is no green light on the tow bar button and nothing happens when you press it.

The iDrive brings up a "towbar electrics failure" warning on vehicle information. I couldn't do the ISTA P programming part of the instruction but I'm planning on using E Sys once I can do the download properly. But reading the forums I get the impression that the towbar should work straight away in a kind of plug and play way. The coding is just there to disable the auto coast function and disable parking sensors etc.

My question is, have I messed up part of the instal and should I expect the towbar to at least have power and retract or is that only something that will happen once it's been coded? I can go back over the instructions again and disconnect and reconnect each plug but I don't want to do it in vain if it's a coding issue not a hardware issue.

I've posed the questions on a few threads but not had any replies and I've searched everything so far but to no avail yet. Any help would be appreciated as I will be jumping for joy when the tow bar finally retracts after all this effort.

Thanks in advance!
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coding, electric, f31, help a noob, help coding, retrofit, towbar

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