No 4wd drive and flashing 4wd light

My 07 Suzuki jimmy has a push button 4wd system, at the moment I have no 4wd and the 4wd light is flashing, the buttons are unresponsive.
I’ve had a different transfer case installed, a different ECU and still no 4wd! After removing the automatic locking hubs and manually pulling them into 4wd I jacked the entire car up and started to drive the wheels. At first the two rear wheels drove as well as the driver side front wheel! I turned the car off and on again and now the two rear are driving and just the passenger side front wheel! Is that at all normal when In 4wd?? And does anyone have any ideas on what the problem could be as well as the fix??

Unfortunately Jacking the car up all at once simply tests the differentials. You may see wheels rotate, you may even see one rotate in the wrong direction.

You need 3 wheels solidly on the ground and then jack one wheel up at a time (in 4WD with the engine off) and try and turn the one wheel by hand. If it is locked solid and cannot be turned then the drive is ok on that wheel.

However the "unresponsive buttons" are a concern. Do you mean they do nothing at all?

I’ll try just jacking up the one wheel and testing it and as for the buttons, I’m assuming whilst the 4wd light is flashing then it’s letting the system know there is a failure somewhere so the buttons are useless at that point. I have in the past through unplugging the ECU and then plugging the two wires in at the same time been able to have a stationary 4wd light and The buttons were responsive when selecting 2wd or 4hi but when I go back to pressing 4wd, the light flashes and again the buttons do nothing

Sorry, just to be clear. The buttons are responding to your request to go from 2WD to 4WD and back, they just do not work during the flashing bit.

Sorry to be pedantic but there is a distinct sequential logic built into the 4WD controller and you need to be 100% clear on the button sequence you are trying.

I thought the 4wd light flashing and no beeping means the transmission can't be bothered with 4wd at all, and has shifted back into 2wd anyway because of a "malfunction".

If this is the case, no amount of testing is going to work.

I'd start by checking that the air hubs go "click-click" (as fast as you can say it) when 4wd is first selected, if they are working and the fault is in the transfer box, I'd expect "click-click", followed a few seconds later by "clack-clack" if the car is winding back into 2wd.

Starting in 2wd I would select 4wd and that is where the flashing would begin and the buttons would stop responding, after essentially resetting the ECU and starting the car up again the flashing 4wd light would be stationary, at this point it would allow me to press 2wd or 4low but trying to press 4wd again from either 2wd or 4low would simply restart this cycle