slihp Posted May 26, 2011 Share Posted May 26, 2011 the specs i attach shows pins 1,2,4,5 being used 1(black and slate) & 4(black) i have taken off my old fog switch (i had the old style dash) which dose switch the fog light on and off but where do i get the wires for pins 2 (red and orange) & 5 (red and yellow). i am assuming these are used for the illumination of the LED on the fog switch. cheers Quote Link to comment Share on other sites More sharing options...
slihp Posted May 26, 2011 Author Share Posted May 26, 2011 ok after studying the td5 electrical circuit diagram book, ive managed to work it out, and got it working on a prototype board. Th illumination for the buttons is in a different section. i guess i can take feeds of existing illumination circuit? Quote Link to comment Share on other sites More sharing options...
western Posted May 26, 2011 Share Posted May 26, 2011 illumination for the switch when off comes from the existing illumination circuit, when switched on the switch feeds the led from another circuit.via the rear fog ecu/relay on your attached page RY = rear fog 12v feed BS = rear fog ON led feed B = earth OR = illumination feed from gauges/other switches. Quote Link to comment Share on other sites More sharing options...
slihp Posted May 26, 2011 Author Share Posted May 26, 2011 got you western. which leads me into my next question. is rear fog ecu/relay basically used for the toggle function of the fog lamp? Quote Link to comment Share on other sites More sharing options...
western Posted May 26, 2011 Share Posted May 26, 2011 Yes, the switch can have a thinner wiring to it & turns the ecu on/off. Quote Link to comment Share on other sites More sharing options...
slihp Posted May 26, 2011 Author Share Posted May 26, 2011 thanks western. I can follow the electrical diagrams fine in the manual, but what are the "HEADER" blocks Quote Link to comment Share on other sites More sharing options...
Gromit Posted May 27, 2011 Share Posted May 27, 2011 ECU? Is it not just a latching relay? Header blocks are where one loom is section is joined to another. Quote Link to comment Share on other sites More sharing options...
slihp Posted May 27, 2011 Author Share Posted May 27, 2011 right gromit, getting to grips with it now cheers guys Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted May 27, 2011 Share Posted May 27, 2011 The fog light ECU costs about £20, it latches the light on and off. A latching relay would probably achieve the same result. Quote Link to comment Share on other sites More sharing options...
western Posted May 27, 2011 Share Posted May 27, 2011 ECU? Is it not just a latching relay? Header blocks are where one loom is section is joined to another. It says rear fog light ECU in the wiring diagrams Quote Link to comment Share on other sites More sharing options...
slihp Posted May 28, 2011 Author Share Posted May 28, 2011 illumination for the switch when off comes from the existing illumination circuit, when switched on the switch feeds the led from another circuit.via the rear fog ecu/relay on your attached page RY = rear fog 12v feed BS = rear fog ON led feed B = earth OR = illumination feed from gauges/other switches. Ok got the fog switch fitted today, it operates the fog light and got the illumination to work when i switch my lights on but try as i might i could not get the led to come on when the fog was on, its was either off or on constant. I did notice in the wiring diagrams Exterior lamps p66 pin 1 & 4 interior illumination p77 pin 2 & 4 so according to this only three pins are used? is this a miss print Quote Link to comment Share on other sites More sharing options...
western Posted May 28, 2011 Share Posted May 28, 2011 1 [from relay terminal 4 black/Slate wire] & 4 should light the coloured ON led. 2 & 4 should be the switch night illumination connection 4 is the earth & the feed out to rear fog light from pin 5 red/yellow trace so that gives 4 pins used not 3. pin 3 is not used no connection. Quote Link to comment Share on other sites More sharing options...
PaulMc Posted May 28, 2011 Share Posted May 28, 2011 . The non-latching Rear Fog Lamp Switch (YUG000530LNF) earths the 'One Touch' Rear Fog Lamp ECU (YWC104430L) momentarily, the ECU then switches and holds it's ignition-switched live (which it gets via the Main Lighting Switch/Headlamp Relay) to the Red/Yellow wires to power the Rear Fog Lamps, the Instrument Pack Warning Light and the Rear Fog Lamp Switch 'tell-tale' Orange LED, until either, the Rear Fog Lamp Switch is pushed again, or the ignition-switched live is interrupted (headlights or engine turned-off) The Pin-outs on YUG000530LNF are - Pin 1 - From Pin 4 of the "One-Touch" ECU (Black/Slate wire) Pin 2 - To Dash Illumination Header (Red/Orange wire) Pin 3 - Not Used Pin 4 - To Dash Earth Header (Black wire) Pin 5 - Live FROM Pin 3 of 'One-Touch' ECU (Red/Yellow wire) - for 'tell-tale' orange LED . Quote Link to comment Share on other sites More sharing options...
slihp Posted May 29, 2011 Author Share Posted May 29, 2011 And we have illumination. my problem was i didnt have visibility of red/yellow wire. is it ok to run a splice from the ecu red/yellow wire? Quote Link to comment Share on other sites More sharing options...
PaulMc Posted May 29, 2011 Share Posted May 29, 2011 And we have illumination. my problem was i didnt have visibility of red/yellow wire. is it ok to run a splice from the ecu red/yellow wire? Yes, that's where it should be fed from. . Quote Link to comment Share on other sites More sharing options...
slihp Posted May 29, 2011 Author Share Posted May 29, 2011 goot there in the end guys, thanks Quote Link to comment Share on other sites More sharing options...
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