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Tapping keyless entry into factory relays 200

posted by  eore on  Sat Mar 15 09:07 CST 2003
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Hello,

I'm trying to wire up a keyless entry system for my 1988 volvo 240 and am running into some problems. I've already done the basic steps, which for me meant getting a passenger side door lock motor and installing it in the driver's side, and then running motor lines up from the rear driver's side door to the new driver's motor. If I activate the switch in the driver's door, all four motors fire.

I've also tapped the keyless/alarm brain into fuses #1 and #8 on the fusebox, so I'm getting power to the whole thing, and it seems to be working. But I seem to not be able to hook into the relay coils in such a way that would make the system work. If I open up the driver's door and pull apart the harness for the switch, I see the red and green wires, which are shorted to the black wire on the same harness to unlock or lock the doors. But if I tap the 'door trigger' output wires from the keyless/alarm brain into the red and green wires on the driver's side door harness, only the unlock part of the system seems to work. I just don't get it. I've checked to make sure I haven't done anything stupid, like blow the factory relays (they still work fine), but I'm obviously missing something about how the system works.

I'm hoping that one of you has gone through this and has more knowledge about it than I. The keyless system I have has what it calls 'negative' triggers to activate the relays, which I assume means that it expects that it will trigger the locks by shorting the two trigger wires to ground, thus completing the circuit. Do I need to put in some sort of relay to make this work the volvo factory system, or I am just being stupid about something? Or should I take the system back and get a 'positive' trigger system?

Any and all help would be much appreciated.

Thanks,

Eric






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