I feel your pain my friend. Have you managed to sort yourself out? If yes, please let me know how.
I've had exactly the same issue as you last Friday 24th May. My keyfob wouldn't unlock my doors so I opened the driver door with my Key (passenger side for you as mine is RHD) and the Alarm went on.
I had that in the past but at the time the Alarm would stop when I put the key in the ignition and turn the key to start position. Well not this time, the alarm kept going on. I cranked up the engine but it stalled after a few seconds as I suppose the security system is doing it's job.
My JK is a 2008 fitted with a 2014 5.7 Hemi from a RAM and with a wire Harness and ECU from HotWire Auto.
I disconnected both batteries, and tightened together the + and - cables with cable ties and left it overnight but no changes. I also tried to remove the M13 Fuse for few minutes but no changes. I recharged both batteries. I replaced the 3 volts batteries of both Key fob and still no change.
I ran a scan with my Autel Maxidas Scan tool and now the Scan tool cannot see the ECU anymore but it communicates with every other modules.
I tried to disconnect the WCM and the Intrusion Transceiver Module and reconnected the batteries and tried to start the engine. The alarm stopped but the engine won't crank anymore!
I called Chris the boss of Hotwire Auto and described my issues and he told me that if the scan Tool doesn't talk to the ECU anymore it is a bad ECU so I ordered a rebuilt one but he hasn't got any in stock at the moment so I am waiting.
I saw a video on YouTube of a Guy who removed the WCM from his Grand Cherokee and bought a rebuilt ECU that has never been connected to a truck. By doing this the new ECU gives him the security red light in the dash but he could start his Jeep with any key without keyfobs as long they fit in the ignition. So I was thinking of doing that too.
I asked to Chris if that would work for a JK but he doesn't think that would work because the start signal goes through the WCM. So even with a new ECU I won't be able to start my Jeep to bring it to the Jeep Dealer regardless of a good or bad WCM because the new ECU must be initialised with the WCM by the Dealership Computer.
One of those “I shoulda done that SOB last weekend when it was on my mind” moments.
I just hung up with the poor service adviser at our friendly neighborhood Communist Regime of Money and Soul Sucking Pocket Drainers (aka the Stealership). Stalin and his bunch of heathens determined the WCM was “offline” and the cause........ that god damn e disco wiring harness melted and that caused it to happen. You’d think that cheaply built piece of shit would have a price tag less than $3000 for just the harness without labor.
Bridget the S/A learned some new words when she told me it would be nearly $5,000 to get out the door today. Poor gal. Going to bypass for now until I figure out which quick discos I’d like.
Thanks for the info J33f3ry