They work!!!! Finished it off today. If anyone's interested in doing the job on a car that doesn't have the wiring (mine's a 2001 FL1 TD4):
1. Take the fuse box out. Just unplug all the connectors from it - they're idiot-proofed so you can't get the wrong one in the wrong hole.
2. On the back of the fuse box, the sockets for the various connectors are labeled (there's moulded writing next to each of them).
3. One of them, with three 6mm spade terminals in it, is labeled C-584. The mating plug should have an empty hole in it (i.e. only two wires coming out). You can check with a multimeter for continuity between one of the pins for Fuse 29 and Pin 1 on that socket, just to double check.
4. Crimp a female spade terminal on to some heavy brown wire (I used 14 AWG) and shove it into the back of the plug.
5. Refit the fuse box and run the wire behind the dash and through to the centre console. You'll need to split it into two and insulate appropriately so that you get one brown wire going to each heated seat switch.
6. Run a pair of heavy wires from each seat heater connector, under the carpet and along the top of the transmission tunnel, either side of the gear lever. The feed wire to the right hand seat heater red wire is blue and pink in the original harnes. The one to the red wire on the left hand seat is blue and grey. The wires to the black wire on each seat heater are also black. These go to earth. There's an earthing stud on the top of the transmission tunnel right under the bottom of the dash. I just crimped both black wires into a ring terminal and trapped the ring terminal under the nut on that stud.
7. If you've bought a pair of heated seat switches and their associated connectors, join the heavy blue/pink or blue/grey wires to their appropriate wire on each connector and do the same with the browns.
8. Each switch connector also has a very thin red and orange wire. These go to a live feed when the lights are on (I piggybacked off the light that illuminates the cigarette lighter socket).
9. Finally, each connector has a very thin black wire. These are earths for the switch illumination and can go to the same earth stud as the seat earth wires.
10. The CCU was present on my car and seems to just work with the seat heaters.
1. Take the fuse box out. Just unplug all the connectors from it - they're idiot-proofed so you can't get the wrong one in the wrong hole.
2. On the back of the fuse box, the sockets for the various connectors are labeled (there's moulded writing next to each of them).
3. One of them, with three 6mm spade terminals in it, is labeled C-584. The mating plug should have an empty hole in it (i.e. only two wires coming out). You can check with a multimeter for continuity between one of the pins for Fuse 29 and Pin 1 on that socket, just to double check.
4. Crimp a female spade terminal on to some heavy brown wire (I used 14 AWG) and shove it into the back of the plug.
5. Refit the fuse box and run the wire behind the dash and through to the centre console. You'll need to split it into two and insulate appropriately so that you get one brown wire going to each heated seat switch.
6. Run a pair of heavy wires from each seat heater connector, under the carpet and along the top of the transmission tunnel, either side of the gear lever. The feed wire to the right hand seat heater red wire is blue and pink in the original harnes. The one to the red wire on the left hand seat is blue and grey. The wires to the black wire on each seat heater are also black. These go to earth. There's an earthing stud on the top of the transmission tunnel right under the bottom of the dash. I just crimped both black wires into a ring terminal and trapped the ring terminal under the nut on that stud.
7. If you've bought a pair of heated seat switches and their associated connectors, join the heavy blue/pink or blue/grey wires to their appropriate wire on each connector and do the same with the browns.
8. Each switch connector also has a very thin red and orange wire. These go to a live feed when the lights are on (I piggybacked off the light that illuminates the cigarette lighter socket).
9. Finally, each connector has a very thin black wire. These are earths for the switch illumination and can go to the same earth stud as the seat earth wires.
10. The CCU was present on my car and seems to just work with the seat heaters.
