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word of warning probley a little to late NEVER EVER jump start a car with todays newwer cars with all the electrical systems on newwer cars voltage spikes can cause alot of damage i assume you probley fryied either the ecm or bcm even if your able to disarm the alarm chances are good it still wont start u need to have it taken in and have it looked at
use the key to lock and then unlock the driver door, this should allow car to start,it shuts alarm off. if its aftermarket alarm system then locate the push button under the dash, its a little push button usaually red, turn key on and quickly push and release this button 4 to 5 times.
On a 91 Cherokee, grounding the ORANGE/GREEN wire from the drivers door lock sensor will permanently disable the OEM alarm. Do NOT try other methods as it will cause the system to lock down. If that happens, nothing short of a dealer reset or completely removing the electronic control system will allow you to start it.
Is this a factory installed alarm system? If so, unlocking the driver door with the key will allow the car to start. If not then you will have to remove the aftermarket alarm system to start the car.
If you have a factory alarm system you can get a new FOB (key chain alarm button) from a ford dealer, but it must be programmed using a scanner , before it will work in your vehicle.