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Opening the drivers door with the key is supposed to shut down the factory security but the drivers key cylinder usually goes bad. You will have to unlock the rear tail gate lock cylinder with the key and that will shut down the factory security, before opening the drivers door.Your other option is to have an aftermarket keyless entry system installed, which will open the doors remotely while shut down the factory security at the same time.
The security alarm system on the 1994 Jeep Cherokee arms itself on any normal exit from the vehicle, i.e. ignition off, open door, lock door with power door locks, close door. If the doors are locked with the key, it does not arm. If the battery is disconnected, then reconnected, the alarm system will go into powerup alarm mode. The lights will flash, but the horn will not blow. The alarms can be disarmed by a keyless vehicle remote or by unlocking either of the front doors or the read lift gate with the key. If the key method does not work with any of those three entrances, there is a problem either with the input to the alarm module or the module itself. There is a switch in both front doors and the tailgate which is activated by manualy unlocking those doors. The alarms can be disabled by permanently grounding the wire going from either of those switches to the alarm module, but this will remove all theft protection. The best thing to do is to find out why the system is going off in the first place. It could just be a glitch, a loose connection that can be fixed fairly easily and keep your theft protection intact.
There is a security system built-in to the Jeep Grand Cherokee during these years. The reason the alarm goes off is because of a change in the electrical system (like shutting a door) that triggers the alarm. To stop the alarm, either disarm with the remote or unlock the door from the outside with the key. This will shutoff the alarm.
You cant disable it realy..but you can use the key to unlock the driver door or the rear door. Both have a alarm shut down wire..Also that wire could be broken in the drive door boot...very common. The wire is purple and yellow..Touching the wire to ground shuts the alarm off. Just make sure if its broke that the end going into truck is the one you groung on the frame. Also locking the doors from the inside with the driver door open is what activates the alarm. That wire can also be found in the drivers side kick panel.....