My car alarm (2007 Mercury Mariner) has been going off uncontrollably at all hours and my neighbors are furious. I cannot afford to take it to the dealer, who wants hundreds of dollars to even look at it. I don't have the time (or money) to try to replace all the sensors. I don't want the car alarm at all. If there was a way to just remove it, I would do it in a heartbeat.
Can the OBD port be used to disable the car alarm? Can it be used to at least see which sensors are misfiring?
Maybe someones google skills are better than mine. I wasn't able to find custom firmware to flash the Smart Junction Box and disable the perimeter alarm. You would still need a J2534 device to accomplish this.
If you have access to the Ford IDS or an aftermarket EOBD2 scantool you can go into the body data to find the malfunctioning switch.
These two connector pinouts show the location of the door, hood and lift gate ajar signal terminals. IIRC each switch is grounded when the switch is closed. You can test this by manually closing the door latch. Also consider the wiring to the door's. They tend to see a lot of flexing and should be considered as well as the switches.
If you want a work around than you could ground the failing switch at the SJB. Effectively the SJB would never see the switch open.
