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  #1  
Old 05-20-2014, 09:49 PM
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2014 key differences

I ordered a new 2014 Grand Cherokee Overland and would like to get some spare key fobs for it the dealer tells me that I need part # 56046759AE and all that I can find on the internet as being available is part # 56046759AA one locksmith said it may work but I would like to know the differences if there is any, both of them look the same with lock/unlock, hatch, start and panic .. can anyone assist with this? ... confused
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Old 05-21-2014, 06:48 AM
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Re: 2014 key differences

What you need to take care of if you buy from a non-dealer source is to insure that the fob you are buying is completely new and never coded to another vehicle...that can only be done once. I can't help you with part numbers, but matching what you have with what you buy is the best practice.
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Old 05-21-2014, 02:12 PM
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Re: 2014 key differences

I was under the understanding that the remotes are just a passive sending device not a learning device but that the car was the learning one and that the car sends out no signal to the remote for confirmation of anything.

But that you must program the car to know the remote not the other way around I know this is how it has always worked on Dodges and Toyotas for me before the fobs could be programmed to many cars, the only disadvantage is that you unlock one you unlock them all that is near and programmed with that remote, but if there was also a key they needed to be cut to the specific car with the jeep not having the need for a key at any point but for emergency(same as my push button start Toyota) then I would think it to be the same?

any more help here you tech guys?
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Old 05-21-2014, 02:56 PM
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Re: 2014 key differences

The remote is coded to the car. It's not a passive device, either, if you have touch entry/keyless start, etc. It's active all the time.
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Old 05-21-2014, 02:59 PM
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Re: 2014 key differences

Quote:
Originally Posted by imblackedout View Post
I was under the understanding that the remotes are just a passive sending device not a learning device but that the car was the learning one and that the car sends out no signal to the remote for confirmation of anything.

But that you must program the car to know the remote not the other way around I know this is how it has always worked on Dodges and Toyotas for me before the fobs could be programmed to many cars, the only disadvantage is that you unlock one you unlock them all that is near and programmed with that remote, but if there was also a key they needed to be cut to the specific car with the jeep not having the need for a key at any point but for emergency(same as my push button start Toyota) then I would think it to be the same?

any more help here you tech guys?
If you really believe that to be the case, buy an eBay remote.
It might work out as you expect. Or the explicit statement in the Owner's Manual could be right and you could be wrong.

I'd be more likely to look around for the online genuine mopar parts discounters, and check with local dealer first as to what they'd charge to do the programming for a brand new key they did not sell.
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Old 05-24-2014, 12:52 AM
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Re: 2014 key differences

anyone else with any views or info on this subject?
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Old 05-24-2014, 03:11 AM
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The ae part is just a new part # from aa. Now that's not to say they didn't change anything. I've seen them on ebay and the like. Not for sure to be honest if they are the same. I would think they are. Just don't buy a used one imho. There's also a key inside the fob that has to be cut.
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Old 05-24-2014, 04:03 AM
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Re: 2014 key differences

The thing that I am not understanding is that the key fobs transmit the signal to the car the cars do not communicate back to the fob

so intern there is no programming of the fob but only of the car accepting the signal from the fob and yes I know that the key does need to be cut correctly for the car.

I have programmed past Dodge cars and Toyota cars to the same fob remotes when the dealer was not needed (not like 2014 Jeep GC Grrrr) and as long as the cars was not near each other you could perform full functions on both cars the only issue if they was near was that the function pressed would active both cars at the same time.

As the person above pointed out that in the manual it stated that you must go to a dealer to purchase a new remote .... of course the mfg will support their dealers before suggesting purchasing a 2nd hand working remote that they are not supplying or making money off of for the 2nd time

.... but maybe I am wrong I have been before and I will be again but I am very willing to listen to others thoughts for we are never to old to learn as we all have done in the past

come on there has to be some more techs out there with answers


Does anyone know of a source for the wiring diagrams of the 14 JGC for I like to do wiring mods for additional devices I install, and it appears they are not releasing the service manuals anymore like in the past
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Old 05-24-2014, 04:46 AM
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Re: 2014 key differences

p/n 56046759A_ is for the Chrysler 300...

p/n 68143505AC is for your WK2.
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Old 05-24-2014, 04:54 AM
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Re: 2014 key differences

Transponder key operation

When the status of the ignition switch (also known as the Keyless Ignition Node/KIN or IGnition Node Module/IGNM) transitions to On, it sends an electronic ignition switch status message over a dedicated Local Interface Network (LIN) serial bus circuit to the Radio Frequency Hub Module (RFHM) (also known as the RF Hub). In vehicles that are equipped with the PEKG system, the RFHM relies upon several Low Frequency (LF) antenna units to challenge the Sentry Key transponders using a LF signal, then monitors responses from the Sentry Key transponders received as Very High Frequency (VHF) signals. The RFHM determines whether a valid key is present based upon the response from the transponder.

If a valid key is detected, that fact is communicated by the RFHM to the Powertrain Control Module (PCM) (also known as the Engine Control Module/ECM) over the Controller Area Network (CAN) data bus, and the PCM allows the engine to continue running. If the PCM receives an invalid key message, or receives no message from the RFHM over the CAN data bus, the engine will be disabled after about two seconds of operation. The Instrument Cluster (IC) (also known as the Common Instrument Cluster/CIC) will also respond to the invalid key message on the CAN data bus by flashing the security indicator On and Off.

Likewise, when any one of the Remote Keyless Entry (RKE) transmitter buttons of the FOBIK is depressed, the on-board transmitter of the FOBIK generates a high frequency RF request signal that is received and validated by the RFHM. If the RFHM determines that the RKE transmitter RF request signal was generated by a FOBIK that is valid for the vehicle, the RFHM relays electronic request messages to the appropriate electronic modules in the vehicle over the CAN data bus to invoke the functions or features associated with the request.

Each vehicle owner is provided with a four-digit Personal Identification Number (PIN) by the dealer at the time of vehicle purchase. This number also appears on the original vehicle invoice and is required along with a diagnostic scan tool for the dealer to program an additional or replacement FOBIK into the electronics of the vehicle. The mechanical emergency key included with a new additional or replacement blank FOBIK must also be cut to match the coding of the lock cylinders in the vehicle.

Each Sentry Key has a unique transponder identification code permanently programmed into it by the manufacturer. Likewise, the RFHM has a unique Secret Key code programmed into it by the manufacturer. When a Sentry Key is programmed into the memory of the RFHM, the RFHM stores the transponder identification code from the Sentry Key, and the Sentry Key learns the Secret Key code from the RFHM. Once the Sentry Key learns the Secret Key code of the RFHM, it is permanently stored in the memory of the transponder. Therefore, once a Sentry Key has been programmed to a particular vehicle, it cannot be used on any other vehicle
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  #11  
Old 05-24-2014, 02:13 PM
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Re: 2014 key differences

The summation of what Milous provided is, Yes, the vehicle communicates with the keyfob and that the keyfob must be programmed to the specific vehicle. (And that can only be done once with a given keyfob)
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Old 05-24-2014, 04:19 PM
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Re: 2014 key differences

Quote:
Originally Posted by imblackedout View Post
I have programmed past Dodge cars and Toyota cars to the same fob remotes when the dealer was not needed (not like 2014 Jeep GC Grrrr) and as long as the cars was not near each other you could perform full functions on both cars the only issue if they was near was that the function pressed would active both cars at the same time.
This may have been true of old keyless entry remotes, but I can tell you for a fact this is not the case for smart key fobs in a Toyota. I post to those forums, and people often have two Toyota or two Lexus vehicles and want to program the same smart key to operate both...it cannot be done.
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