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Thread: D4 not detecting trailer wiring

  1. 21st December 2014, 11:46 AM #1
    wombathole's Avatar
    wombathole
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    D4 not detecting trailer wiring

    Just replaced the camper's tail lights with LED units and new cabling up to the car. All the lights are working as expected, but the D4 is not detecting the trailer connection any more. (ie: no trailer icon on the driver's display)

    I'm assuming the D4 is therefore not going to use the trailer assist driving mode.

    Any idea why its not being detected? impedance of LEDs compared to bulbs?

    And how do i fix it?

    Thanks, Andy
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  2. 21st December 2014, 12:15 PM #2
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    "impedance of LEDs compared to bulbs"

    Yep, this is common. Wire in a globe between the earth wire and one of the indicator circuits as a cheap fix (on the trailer or the plug itself is fine).

    I think Gordon's (gghaggis) GOE off-road booklet covers it somewhere but I don't have it on me to check. I'm sure someone will be along shortly with more detailed info.
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  3. 21st December 2014, 12:50 PM #3
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    sniegy
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    Has been covered many many times before.
    Search the forum.
    But in Short you will need one of these.
    Linear Electronic Design | Home
    Or as has others done make your own.

    Cheers
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  4. 21st December 2014, 04:18 PM #4
    nat_89
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    Ive only towed a trailer once or twice with mine thats all and never noticed anything about a trailers on the screen. Is it meant to show a icon or something when towing?
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  5. 21st December 2014, 07:05 PM #5
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    sniegy
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    Quote Originally Posted by nat_89 View Post
    Ive only towed a trailer once or twice with mine thats all and never noticed anything about a trailers on the screen. Is it meant to show a icon or something when towing?
    When you indicate the trailer icon illuminates in the instrument pack to let you know you have a working indicator.
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  6. 22nd December 2014, 06:32 AM #6
    nat_89
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    Quote Originally Posted by sniegy View Post
    When you indicate the trailer icon illuminates in the instrument pack to let you know you have a working indicator.
    Cheers never knew ill keep an eye out for it!!
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  7. 22nd December 2014, 09:22 AM #7
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    If you don't have the resistor pack in the trailer wiring when using LEDs, following drivers may notice your blinker lamps constantly flickering.

    You can get a pack from Ford dealers as the Territory has the same problem and the pack is relatively cheap when compared to other after-market ones.

    Diana

    You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.
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  8. 22nd December 2014, 11:59 AM #8
    Mossy
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    I just bought a Narva resistor and wired it across the r/h indicator.
    The car now recognises there is a trailer, though the trailer light on the dash only flashes with the r/h indicator.
    You would have to add another resistor to the l/h indicator if you wanted that to flash on the dash as well.

    Cheers Mossy
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  9. 30th December 2014, 12:58 PM #9
    jwb300
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    Quote Originally Posted by Lotz-A-Landies View Post
    If you don't have the resistor pack in the trailer wiring when using LEDs, following drivers may notice your blinker lamps constantly flickering.

    You can get a pack from Ford dealers as the Territory has the same problem and the pack is relatively cheap when compared to other after-market ones.

    Diana
    Diana,

    Does this allow all of the D4 towing functions to work properly? I assume it fits into the LR round plug too?

    Cheers,
    JWB300
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  10. 30th December 2014, 01:03 PM #10
    jwb300
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    Quote Originally Posted by Mossy View Post
    I just bought a Narva resistor and wired it across the r/h indicator.
    The car now recognises there is a trailer, though the trailer light on the dash only flashes with the r/h indicator.
    You would have to add another resistor to the l/h indicator if you wanted that to flash on the dash as well.

    Cheers Mossy
    That is exactly what I have done but I'm not sure if doing this enables all of the towing functions?

    Surely someone has invented an adaptor that contains two resistors so that you don't have to install resistors on all of your trailers.

    Cheers,
    JWB300
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