Tap the ignition lock cylinder with the plastic end of a scrwedriver (with the key removed). then insert the key and try to start. Try this several times. If you get it to turn immediately replace the igntion lock cylinder. The cylinder needs to be in the on position in order for the lock button to be depressed so that the cylinder can be removed from the housing.
If you still can't get it to turn than you will have to drill out the lock button in order to get the old lock cylinder out. I wouldn't recommend doing this unless you have some experience and understand what you are doing.
The lock button can be accessed by removing the lower steering column cover.
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Unlock all of the Jeep Grand Cherokee's doors and open the driver's side door. Keeping the door open, lock it using the manual lock on the door itself.
Put the manual key into the ignition and switch it to the "On" or "Run" position, whichever applicable, without starting the engine.
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Point the remote at the receiver (located by the little bulb on the car ceiling) and hold down the "Lock" button for up to 5 seconds.
When the driver's side door unlocks, you know the remote has been programmed correctly. If you are only programming one remote, jump to the next step. If not, manually re-lock the driver's side door and repeat steps 5 and 6 using each remote you would like to program and then continue.
Turn the key to the "Off" position and turn the ignition on immediately. This must be done within 20 seconds of programming the last remote. You're finished!
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