by David Clair
Polka Dot / Polka Dot / Getty Images
Some Jeep Grand Cherokee models are equipped with an immobilizer antitheft system that disables the engine. The system is activated when anything other than an authorized key is used to attempt to start the engine. Most models are also equipped with an alarm system as part of the security system. If something triggers the immobilizer or alarm system, you must reset and rearm the system.
Open the driver’s side door. Close the other doors.
Press the power door lock switch on the keyless entry remote control.
Close the driver’s side door. Leave all doors closed for about 16 seconds until the vehicle security light in the instrument cluster stops flashing rapidly. When the light blinks at a slower rate, this means the system has rebooted and rearmed.