Is there a (Bluetooth?) OBD module that can transmit to a receiver that remote controls a car trailer board lights ? I have seen the magnetic bluetooth "stick on lights" that are powered by internal rechargeable battery and claim a 20 meter signal range from a bluetooth paired transmitter plugged in to the car's existing wired 7 pin car trailer socket. What would be useful is if the above transmitter derived its signals whilst plugged into a car's OBD port.Such a device would eliminate splicing into the wiring loom as necessary for a conventional hook up. In short are the side lights/ brake/indicator/and license plate illumination signals incorporated in the OBD ?
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So what about the shielding of the car body and dash etc? The trailer socket is usually outside the vehicle.– Solar MikeCommented Feb 14, 2021 at 22:19
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Welcome to Motor Vehicle Maintenance & Repair! For the most part no. These are operated by the Body Control Module (BCM) ... I believe almost exclusively. I would doubt the signalling from a switch to the BCM even goes through the CANBus network, but through its own wiring.– Pᴀᴜʟsᴛᴇʀ2 ♦Commented Feb 14, 2021 at 22:20
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Solar Mike, good point, but even if the advertised 20 meter Bluetooth range was restricted to half due to shielding, 10 meters (30plus feet) should be adequate for reliable operation? The reason for raising this topic is that I very rarely use a trailer and although fitted a tow bar am reluctant to splice into the existing wiring cautious of the can bus sensitivity. I'm thinking that in staying with the motive for the Bluetooth temporary magnetic trailer lights why not have the transmitter module on the end of a cable extended to the back seat /rear window closer to the receiver?– SolostaxCommented Feb 15, 2021 at 1:32
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So how do the ones used by the heavy haulage breakdown companies work?– Solar MikeCommented Feb 15, 2021 at 6:27
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By the time you do all that with a bluetooth module you could have run a physical connector which would be more reliable. Bluetooth is fine for syncing watches to phones and headsets for boring work phone calls, I'm not sure I'd trust my life to it.– GdDCommented Feb 15, 2021 at 9:21
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I think you're on a very good path with this. Between 2022 and 2024 Hyundai changed the wiring in the Palisade so that you have to attach directly to each tail light and the battery to install even with the Curt adapter. For as infrequently as I haul a trailer I'd love an OBD2 wireless solution. My idea would be a cigarette lighter powered receiver that had the 4-way output for the trailer. I might just try to rig this up with an ESP32 and some relays. Cheers
