R34 Auto Headlight Switch?

[MadMatt00001]

5. This part covers the high beams and parkers, disconnected the battery and grab a multimeter that measures continuity and go to the headlight connectors, on the big connector you need pins 2 and 6 on the small one, pin 12, pins 2 and 6 are the high beams and pin 12 is the parkers. Next, go to the side of the car, there is a loom running across the side, undo one of the plastic pipes and all the duck tape surrounding the wires, check which colour each wire connected to the pins are, before cutting, double check they are right with a sharp pin and the multimeter, use the pin to pierce a hole in the wire, if it beeps, cut it. You should have cut a total of 3 wires, now, run 3 more wires but this time just from the fuse box to the cuts you made in the loom, next, solder the cut wire (both ends or some things won't work anymore) to the wires you ran. Eg, if you cut one high beam wire it will split into two parts, solder both of these parts to one of the wires, then continue for the other two. Next, look at the r34 fuse box cover, it will tell you which two relays to snag from the sedan "headlamp" and "tail lamp" in their respective holders, push them out the back and plug them in the same spots on the coupe holders. Next, solder the tail lamp wire you ran to the tail lamp relay, and the wire you ran to the head light stalk to the other pin (check the manual) same for the high beam wires, now cut the wires coming from the 2 10A head light fuses and connect them to the high beam relay, and the wire from the 10A tail light fuse and connect it to the tail light relay.

6. The end is nigh, finally go to the auto headlight control unit connect and cut the wires going to pins 2, 6 and 7 (remember the orientation is from the back, not front) and run 3 new wires to the head light stalk and yep, you guessed it, solder them to these three wires. Now, if all done correctly, you can connect the battery and all 3 of the wires you ran from the fuse box to the head light stalk when connected to ground should either fire the low beams, high beams or parkers. You should also have a total of 6 wires going to the headlight stalk area, but it's going to increase by one. Next, run another wire (last one, preferably black because it's ground) from a good grounding point on the car (next to the fuse box in the drivers side foot well there is a grounding bolt which is what I used) to the headlight stalk, now you can start zip tying everything in the foot well. Next cut the wire at a reasonable point and solder a diode to each wire coming from the fuse box, the line on the diode facing away from the wire, and solder the wire onto the other side of the diode.

7. Now, this is the last part (you can put the side panel and stuff back on and bolt down the fuse box, it's all done, also, if you haven't wrapped all your solder connections in tape yet, do it, plus wrap the fuse box tab and loom together again). Cut both head light stalk connectors off but make sure there is a reasonable amount of wire left, first we will wire up the indicators, there are 3 wires responsible for this, the blue and white cable, a green and black cable and a creamy coloured cable, these are on pins 4, 7 and 8 of the large connector, solder them so that the creamy coloured cable is on pin 4 (unfortunately I forgot the polarity for the other 2 but if it doesn't work, switch them around but I think blue and white goes to pin 2 and green and black goes to pin 3 otherwise it's 3 and 2 respectively, sorry and don't worry, nothing will blow up or die), next connect the wire you connected to pin 7 of the auto light control unit to pin 5 of the big connected for the headlight stalk, then pin 6 of the auto light control unit and the wire you ran for the low beams to pin 12 of the small connector for the stalk, then connect the wire from pin 2 of the auto light control unit and the wire ran for the tail light to pin 1 of the large connector for the stalk, finally connect the high beam wire to pin 8 of the stalk and you are done! Just connect the auto headlight control unit to the connector and the unit into the trim above it, tidy up your wires and put the rest of the trim back together. If you have any questions please comment below, I'm sorry if this seems a little simple or vague. If you want to test it, flick the headlight stalk on different settings, also, your car key needs to be in the "on" position for the auto function to work as well as it being dark enough (or if you want them off, light enough), also, leaving it in auto and taking the key out will turn off the headlights, cool huh? 

Edited July 20, 2018 by MadMatt00001