Central Locking - Solution needed!

Discussion in 'The Projects Forum' started by Sosijdog, Nov 11, 2009.

  1. Sosijdog

    Thread Starter New Member

    Nov 11, 2009
    5
    0
    Hi guys, brand new to this forum and looking for some assistance on a central locking problem.

    Ok, here we go. My van already had central locking but it was only activated with the key in the lock. I purchased and fitted a keyless entry system (a zapper basically) so it could be done remotely. This part works perfect.

    However, I would like to use the Trigger wire from this central locking unit to flash the hazard warning lights when locking and unlocking but with the current hazard warning system in the vehicle I cannot get it to work that easy.

    The trigger wire was designed to work on side lights and simply supplies a stab of 12v dc – once when locking and two stabs when opening. I thought it would be a simple case of joining this into the power input for the flasher unit at the hazard warning switch. However the hazard warnings are operated with a “push push” type switch – so basically it gives a stab of power to start them then a stab of power to stop them. Probably done with a transistor switch?

    Now here’s the thing – as I said before my trigger wire gives one stab on locking and two on opening. So it works fine when unlocking (gives a stab to start the flashers then a stab to stop) but only one stab on locking so they continue to flash. So I would need something to give me a delayed pulse after I trigger the doors to lock. (which would give the flashers the second stab of power to stop them flashing).

    Is there any way around this? I would ideally like a simple solution (don’t we all!) like a simple plug in component between the trigger and flasher power wire?

    Anything out there that would give me what I am looking for? :confused:

    (Someone suggested that I just wire it up like its supposed to be but I would like to use the Hazard warning lights. They look more authentic, are easier to see from any angle but most of all I am just interested to see if I can get it to work!)

    Thanks in advance guys.
    Stevo.
     
    Last edited: Nov 11, 2009
  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    Usually the flashers have a common(+) wire running through all of them so they turn on at the same time, what I did for my truck is I wired a relay to the positive wire of the hazard lights (Which bypasses the hazard flashing circuit), this way the lights will flash once for the first trigger, then twice with the double trigger.....

    My .02
     
  3. Sosijdog

    Thread Starter New Member

    Nov 11, 2009
    5
    0
    Hi there, thanks for the reply.

    The flasher relay I have on my vehicle uses a single relay but split in two so that one half is for the right hand turn signal and the other half for the left. The hazard switch (I think) uses a transistor switch to turn on both sides at the same time so I have two wires to power the flasher relay not a single.

    That is mainly the problem. I also need them to work as normal to pass the vehicle Test every year. (I am in the UK).

    I was thinkin about some sort of delay relay that starts timing from the moment I energise the lock button (the locking relay will pulse to start the flasher) and after a few seconds the delayed relay would give a pulse to stop it. But I dont know if such a device exists?

    Anyone know about this?
     
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234

    You can just run 2 wires off of a relay to control both sides, since you are just flashing them when ever there is a trigger output from the remote, this will not affect the function of the flashers, your vehicle should pass inspection just fine, basically the flashers will still work the way they were intended to work, and the lights will just flash when ever there is an output pulse from the remote receiver..... (On my truck the flashers still work the same way, the lights just flash when I arm/disarm the alarm, or when using the vehicle finder button and also when the alarm is triggered).

    My .02
     
  5. Sosijdog

    Thread Starter New Member

    Nov 11, 2009
    5
    0
    Thanks for that BMorse you're a genius!! :)

    That is the way to do it. I will just have to locate the two wires from the switching unit and splice onto them.

    Spot on advice. Much appreciated.
     
  6. Sosijdog

    Thread Starter New Member

    Nov 11, 2009
    5
    0
    One more thing about this set up....

    By doing this will I need 2 diodes in the circuit (one for each wire)? Because if I dont, when I indicate either left or right the otherside will also flash because the wires are coming back to a common point on the relay.

    Thanks again.
     
  7. reggs

    New Member

    Oct 22, 2009
    1
    0
    Ah memories, memories. I did exactly this about 20 years ago on a VW Golf when I was a teenager. I'd not used the 2 diodes and remember the happiness of getting the 4 indicators to flash when I pipped the alarm and then the dismay when I signalled to turn a corner and had all four indicators go off.

    The diodes did the trick in the end !

    Good luck !
     
  8. Sosijdog

    Thread Starter New Member

    Nov 11, 2009
    5
    0
    Ha ha, Cheers dude! But experience is never wasted. Doing things right first time means you dont learn nothing.

    I will go with the diodes.

    Thanks for all your help guys - Much appreciated.

    Stevo.
     
Loading...