Window closure from alarm (without control module)
Discussion
Chaps,
My old 944 S2 has a very simple electric window control system. The details can be seen here:
http://www.clarks-garage.com/pdf-manual/elect-20.p...
... but in essence the window switches are DPDT switches which connect directly to the window motors and cause the window to work in either forward or reverse polarity depending upon how long you press the switch for. There is no 'control unit' per se, and no relays either (the power for the window motors all runs through the switches).
I have an alarm (Toad) which has function outputs, one of which is designed to connect to the electric windows. I have never connected this, but am thinking about doing so now.
My question is, what is the most elegant way of doing this? The alarm output holds low for 20 seconds (although this can be adjusted up or down) and needs to switch as many relays as necessary to make the windows both wind up (it's a two-door car.)
I can see that a popular option is to buy a window closure module, but I am not confident that these can be connected to a system as simple as mine; they all seem to offer more sophisticated functionality when connected to a car with a window control system - and I'm not interested in the extra functionality and don't have a control system to connect it to.
Would the following circuit work?
If not, why not? Whether or not the diodes would pass enough current to run the window motors is one concern, but this aside I can't see why it wouldn't. There is a potential issue of whether things would go awry if someone was pressing the window switches when the alarm was trying to close them, but this is so unlikely to happen I think I'll just put some fuses in the circuit and let them blow if this happens.
All input welcome - thanks.
Oli.
My old 944 S2 has a very simple electric window control system. The details can be seen here:
http://www.clarks-garage.com/pdf-manual/elect-20.p...
... but in essence the window switches are DPDT switches which connect directly to the window motors and cause the window to work in either forward or reverse polarity depending upon how long you press the switch for. There is no 'control unit' per se, and no relays either (the power for the window motors all runs through the switches).
I have an alarm (Toad) which has function outputs, one of which is designed to connect to the electric windows. I have never connected this, but am thinking about doing so now.
My question is, what is the most elegant way of doing this? The alarm output holds low for 20 seconds (although this can be adjusted up or down) and needs to switch as many relays as necessary to make the windows both wind up (it's a two-door car.)
I can see that a popular option is to buy a window closure module, but I am not confident that these can be connected to a system as simple as mine; they all seem to offer more sophisticated functionality when connected to a car with a window control system - and I'm not interested in the extra functionality and don't have a control system to connect it to.
Would the following circuit work?
If not, why not? Whether or not the diodes would pass enough current to run the window motors is one concern, but this aside I can't see why it wouldn't. There is a potential issue of whether things would go awry if someone was pressing the window switches when the alarm was trying to close them, but this is so unlikely to happen I think I'll just put some fuses in the circuit and let them blow if this happens.
All input welcome - thanks.
Oli.
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