You may need your factory code, which should be either on the driver's door, the back hatch or under the hood. If you can't find it, call your dealership with your vin # and they can give it to you. Or you can do like I did, and have them do it for you - it's usally pretty cheap.
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TThere is probably a problem with the door unlock relay or the passenger door module. The passenger door modules on Jeep Cherokee have had a lot of problems and there are a couple of Technical Service bulletins published by the manufacturer as a result of these failures.
Before replacing any Relay. Try disconnecting the negative side of the battery for at least 2-minutes to de-energize the security system, re-setting itself. The reconnect the battery and try your security (and options) system again.
The only other big question that you will have to know: is this a factory installed security system or an aftermarket security system? This makes a difference in security systems, relays etc.
TRY THIS: Sit inside the vehicle with all the doors closed. Place ignition in the OFF position. Open the driver's door. Leave Open. Move the mechanical door lever to the LOCK position. Turn the ignition to the RUN position. Aim the transmitter at the Keyless Entry receiver and press Lock button. Hold for five seconds until the door locks cycle. Turn ignition OFF within 20 seconds
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