Hey Gary.
There are two issues with electric brakes that the L322 share with D3, D4 and RRS, solving them is the same process but the bits are in different spots....
1st is the harness from the Trailer Light Module to the factory 7 pin plug under the bumper is not Aus standard - its EU and the colours are different not that it is the colours that are the problem but it adds to the confusion. Big problem here is that EU has 2 tail light circuits, pin 7 and pin 5. You need pin 5 for trailer brakes so the wire going to pin 5 (brown) has to be cut and joined to the wire going to pin 7 (Black), you need to join these to prevent getting a light out message every time you connect a trailer - the TLM checks both indicators, brake and tail lights in the L322. I did this about 100mm from the TLM. If the previous owner has towed the dealer may have already done this bit, or part of it (yes the dealers are cutting and soldering the factory harness, but only when fitting a controller or if the owner complains!) - first pull the socket off the car and check it matches the EU diagram below – giveaway is black in the middle instead of brown. This first bit is really important, in the D3/4 section there was a write up by a bloke in Melb who picked up a new van and towing it home the auto lights turned on resulting in van brakes locking up (auto elec who installed the controller didn't know about this 1st issue).
While you’re there cut the wire going to pin 2 – it has the rear fog lights and it’s caused many problems on here when a trailer is used with something connected to pin 2, I connected the reverse lights so the camper has reverse lights, handy when arriving at camp in the dark.
2nd is the connection of the “Brake light sense” wire (red) for your new controller. It must connect to the output of the LCM. Usually this connects to the brake light switch under the brake peddle, but in later euro cars the switches are Hall Effect meaning that they won’t be giving a 12v signal when on. So it needs to connect to the wire carrying the brake light signal to the TLM from the LCM (not the actual brake light). "Red brake switch sense wire connected to Black/Blue wire coming out of top connector of the Light Check Module (LCM)".
Take a look at:
Installing a Trailer Brake Control in a Range Rover III/L322/LM it details a LHD vehicle but the only difference is that you want the controller on the other side which makes it heaps easier, mine is recessed into the pocket where the OBD2 port is - just make sure you solder and don't use those stupid blue connectors like he has, they don't last...
The output from the brake controller (Blue wire) can then be connected to the (Brown) tail that was cut (going to pin 5) while solving the first problem. The result will be the brake controller feeding pin 5 and TLM feeding both tail light wires to pin 7.
The Aus standard is also in the attachment.
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