2007 Expedition EL - OEM alarm goes off when starting vehicle

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Mr Shank

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We have a 2007 Expedition EL that has the OEM alarm add-on, with the alarm indicator under the dash, next to the OBD port. Apparently this was a dealer installed option, and might be part of the remote keyless entry?

In any event, on occasion when turning the key to the on position, the alarm will go off. We have two sets of keys and fobs, so my next step was to have my wife use my keys, because she drives the Expedition as a daily. We've had the vehicle for about 3 months, and this is recent as of about a month ago. It happened two or three times then, and then nothing. Now it happened again today.

While I will be removing this and installing something else eventually, I'd like to get this fixed for now, without spending hundreds of dollars.

~Mr Shank
 
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Mr Shank

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Electrical check came back good. Still fighting with this.

Any ideas would be helpful.
 

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