Tap into a 'reversing light' wire for reversing camera on screen

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  1. Tap into a 'reversing light' wire for reversing camera on screen 
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    I want to tap into one of the reversing wires so that I can send a 12v control signal to my car PC screen, so that it automatically switches over to dislplay the signal from my new revesing camera when the car is put into reverse. I just need a line that sends a radio type 'blue wire' (low current) signal to the screen when reversing. My car is a 97 e36 328i. Any ideas how I can do this?

    I could take it off the revesing lights at the back (dont want to get the carpet up again if I ont have to...) so is there a wire I can tap into near the center console,where the screenis located (in the Radio 1 DIN slot). Thanks
     
     

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    If you can get a wiring diagram, perhaps you can. In my case, I needed to run a wiring loom from the camera to head unit anyway (ie the video signal), so I spliced the power wire from the camera into the rear lights at back - this now carries current (powering up the camera) and can connect up to the reversing wire on your head unit or screen at front of car. Hope this makes sense.
     
     

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    Dr of BMW gildersol's Avatar
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    I believe the reversing light signal comes from your auto range switch and is coloured blue/yellow. (live when reverse selected)
     
     

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    Thanks for your help. I will have a look into this
     
     

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    Got the reversing camera in today & tapped into this blue/yellow wire. Its working great so thanks for your help here.
     
     

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    Good stuff
     
     

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    Although it works I am thinking that it would be safer to run a 12v feed off the reversing lights to the screen 'reversing' wire. At the moment the screen is connected to the gear selector wire that goes into the gear box, so if the screen went on the blink & put 12v onto thhat wire it may put the car into reverse while I was in the fastlane = expensive risk I think I will avoid. Dave
     
     

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    I'm not sure what you mean. Is this the blue/yellow wire we are talking about?
     
     

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    Quote Originally Posted by neumo View Post
    Although it works I am thinking that it would be safer to run a 12v feed off the reversing lights to the screen 'reversing' wire. At the moment the screen is connected to the gear selector wire that goes into the gear box, so if the screen went on the blink & put 12v onto thhat wire it may put the car into reverse while I was in the fastlane = expensive risk I think I will avoid. Dave
    If you car is a manual there is no way it could do that as the gear stick has to physically move
    And i dont think a auto could do it either as the stick has to move to.
    Im thinking that wire just tells the lights if your reversing or not
     
     

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    Quote Originally Posted by neumo View Post
    Although it works I am thinking that it would be safer to run a 12v feed off the reversing lights to the screen 'reversing' wire. At the moment the screen is connected to the gear selector wire that goes into the gear box, so if the screen went on the blink & put 12v onto thhat wire it may put the car into reverse while I was in the fastlane = expensive risk I think I will avoid. Dave
    No chance of going into reverse, the gearbox is still rod actuated when you move the gear selector
     
     

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