I installed an Autopage RS-750lcd into my 2001 Ford F-150 and the alarm goes off by itself after about 45 minutes or so after being armed. The door trigger flashes on the lcd screen as a result. I think that the lock sensing system of the truck shuts down like the auto-off light feature. Has anyone had a similar case and if so how do I fix this problem?
Also which is best to use
(Tach Sensing or Voltage Checking)
(555F or 555U)
Do you need an unchipped key to program the 555F?
I have both originals keys.
On newer Fords approximately 45 minutes after closing the last door the vehicle's BCM sends a pulse down the door trigger line thus causing your alrm to false. What I've done in the past is wire in a relay so that opening the door triggers the relay and sends either 12volts or ground to the trigger for the alarm. The pulse the BCM sends isn't large enough to trigger a relay.
Happy metering
Where did you get your door trigger from? You have something wired wrong.
DanDan
Use this diagram to bypass falsing of the door triggers:
Also, if you have two programmed keys already, I suggest using the 555F module over the 555U just for security measures. As far as tach or voltage sensing, I always use tach sense mode for all my installations.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
sorry vm, i would agree with anon on this one. the diagrams show that you would have to make connections to every door pin in the vehicle.
wire up a relay like this:
https://www.the12volt.com/relays/page1.asp#p2n
except 85 to ground only, 30 and 86 together, this would give you a (+) output on 87.
much easier than running wires to every door pin.
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ex 12 year car stereo, alarm techie.
now in res/com low voltage,voice/data
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