keen 6 Report post Posted March 6, 2018 Is there any way I can wire up the trailer plug without the module, or having to take it into the stealer who wants about $700 to fit it to my car, Is it possible to do it myself. I have pretty good wiring knowledge Quote Share this post Link to post Share on other sites
hotwire 352 Report post Posted March 6, 2018 Yep with a handful of relays, 4 actually - one for each circuit. Not done one on an E90 but you may find the tail needs to be taken from the license plate lamp circuit. Quote Share this post Link to post Share on other sites
aja540i 1906 Report post Posted March 6, 2018 I got a used towbar and module from a wrecker and wired myself on the M5, took a bit of homework finding the wiring diagram but job itself was quite easy. Quote Share this post Link to post Share on other sites
NZ00Z3 187 Report post Posted March 6, 2018 I installed one of these relay units when doing the trailer wiring for the E46. It was relatively easy. https://www.trademe.co.nz/motors/trailers/trailer-parts-accessories/lights-cables-plugs/auction-1558757631.htm?rsqid=12bdeb367e944c55855633622e0201c9 1 Quote Share this post Link to post Share on other sites
keen 6 Report post Posted March 8, 2018 thank you, Quote Share this post Link to post Share on other sites
