I would bypass as much of the integrated RR electics as possible. Most of the newer vehicles use ground sensing over resistance to know when to trigger. Bypassing all of that is nice for the owner (you wont have to buy schematics and such) when it is possible. What's I would guess is that Range Rover uses a similar system and the addition of the trailer lights to the common ground for the lighting board is creating enough load on the ground to make the lighting board think the switch is engaged. What happens if you let the trailer lights ground through the ball/frame and remove it (ground) from the harness? Might try it with a test light to see. This may work as the overall load on the common ground to the lighting board will not be increased, but there will be enough current to power the lights, as that is the current wire being used. Of course this all hinges on RRs setup of lighting. They may be using some super secret squirrel stuff I have never seen.
The last vehicle I looked at with this type of system used a CG for all blinkers, headlights, foglights, interior dome, door locks, and window circuits. A sense on the circuit board worked kind of like binary math to let the conrtol unit know where to send power. So let's say the driver window up was 330ohms, then the circuit knew to roll the window up. 800 was fog lights, so a total of 1130 let the circuit know to roll up the window and turn on the fog lights. It really sucked for aftermarket integration, but I can see where a modular system like this makes it very easy for the manufacturer to reduce cost, and make maintenance much easier.
Be lucky its a range rover. I hear the new Infinitys and Lexus have fiber for comms. That would really suck, as there is now way to tap a fiber for a signal.
The last vehicle I looked at with this type of system used a CG for all blinkers, headlights, foglights, interior dome, door locks, and window circuits. A sense on the circuit board worked kind of like binary math to let the conrtol unit know where to send power. So let's say the driver window up was 330ohms, then the circuit knew to roll the window up. 800 was fog lights, so a total of 1130 let the circuit know to roll up the window and turn on the fog lights. It really sucked for aftermarket integration, but I can see where a modular system like this makes it very easy for the manufacturer to reduce cost, and make maintenance much easier.
Be lucky its a range rover. I hear the new Infinitys and Lexus have fiber for comms. That would really suck, as there is now way to tap a fiber for a signal.
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