Yep

P1668.

01' Disco.

The scenario: Truck drove and ran fine prior to parking -- Did some investigating on some issues and ended up swapping out plugs and wires. No other work was performed.

Battery that came with MagPie was from 2011, decided it was time for a new one. Truck was unhooked from any battery for about 3 days, then installed new battery. Upon "connecting" the new battery, the car alarm immediately went off (can't remember if the car was locked or not when old battery was disconnected) enlisted the help from my beautiful Wifey to disarm the alarm via the key in the drivers door when connecting the new battery -- alarm stopped and all was well.

The Problem:

Truck won't start now. Cranks for days but nothing happens. Battery voltage of new battery after a few cranking attempts is 12.3v. Read up on a dozen or so threads and still haven't gotten anywhere. No dash lights other than the battery which I believe is normal when starting the car -- goes away after engine catches When locking the car with the key in the door, the red LED rapidly blinks for 10 seconds and then calms down to the normal slow pulse of the being locked / alarmed. No LED flashes when trying to start the car. Key fob does not work on this truck

What I've tried:

Using the key in the door, unlocking 3 times. Nada.
Doing the 1515 code thing. Nada.
Rolling down the window, locking the truck, turning on the headlights and turning the key to position 2 -- Alarm went off. Still Nada.

What I've read:

A few posts/threads suggesting changing the CPS solved the issue but.. I don't think this could be the problem
Getting a new BCU and doing all that programming nonsense.. I don't think this could be the problem
Disconnecting the ground and letting is sit overnight works apparently
Touching the pos / neg leads to each other to reset the BCU? Might have been a Disco 1 thing but not Disco 2?

So now I'm like

 

Found some more threads about this and there was a suggestion about disconnecting the battery for a while.. Tried that and still the same result.

I also failed to mention that I had pushed the inertia switch on the firewall and that didn't seem to do anything

I guess i should get a new CPS because that also seemed to be the solution to this issue but i kind of find that hard to believe.. Should probably have an extra anyways

 

I would ask and see who is within a reasonable drive from you, that has a scan tool that can turn the alarm off.
Eliminate that problem, and hopefully fix your issue.

 

Maybe. I'm assuming my AL619 won't do the alarm disarm

 

The Autel AL619 won't do any programming it's designed just for reading and clearing fault codes only.

 

Well that answers that!

 

Have you replaced the battery in the key fob?

I agree next step Crank Position Sensor.

 

 

I once had the small button break off the circuit board inside the fob. A small dab of solder fixed it.