I'm in the process of installing cruise control system in my 2001 TDDi.
Firstly, I checked the plug on the steering wheel, behind the airbag. There was a full row of pins. My car only used (I believe) 2, for the horn. I bought an airbag with the buttons for the cruise control. Fitted it. Then the horn wasn't working. I played around with FORScan, activated cruise control and the icon in the instrument cluster, and now the horn is working.
Next, pedals sensors. I bought the green and 4-pin red sensor. Unfortunatelly my wiring loom is not ready for cruise control. I need a CC wiring loom, but since I can't find one to buy (I'm from Poland), I must make one myself. I found a couple of schematics, but either for a petrol engine or a facelifted diesel. Apparently facelifted diesels don't have a connector near the gas pedal. Therefore I have no idea how to make a new wiring loom for the sensors.
Here's how my stock loom looks. (I already added the green sensor, and 2 wires for the red one, according to one of the schematics)
Here's how the main plug looks like:
Pins 3, 6 and 7 are free. I've heard that some versions (probably facelifted) have pins 1, 2 and 13 free.
I have two new wires, one from the green sensor, and one from the 4-pin red sensor. Where do I connect them?
BTW if someone wants to do the same for their prefacelift - I'm not sure if you can activate CC in FORScan. I have a facelifted GEM (generic electronic module) and an added CAN wiring because I was installing a Denso headunit. I don't now if GEM has anything to do with cruise control, but I thought it's worth mentioning.