Finding Reverse Light Circuit for 2024 BMW X7 For Towing Trailer with Surge Brakes
Updated 06/19/2025 | Published 06/16/2025
Question:
Hey guys, Im installing the optional towing kit for the stealth hitch on my 2024 BMW X7. This car has the updated CAN tail/brake/turn lights that require tapping into the signals at locations other than the tail lights which IS laid out in the install instructions. HOWEVER I will be towing a ski boat trailer that has a surge brake so I NEED the reverse light signal... The wire diagrams I found only show the reverse light INSIDE the rear INNER tail lights but the wiring is just CAN BUS wires. CAn you possibly tell me where the catch a reverse light signal for the surge brake? Thank you, Nick.
asked by: Nick F
Expert Reply:
That normally would be tricky since CANBUS wiring carries multiple functions on a single wire but reverse lights would only have a single type of function unlike stop/turn lights so I would find the wiring of the reverse lights behind the sockets and test for voltage with a volt meter and see if it has the needed 12 volts ran to it.
Does the trailer have drum or disc brakes?
Nick F.
6/18/2025
There are no sockets. It’s a led tail light. There must be a signal wire near the module by the glove compartment like the turn signals.