Dead battery, issues trying to get my 02 running

[saskapath]

I'm in Saskatchewan and it's been brutally cold here. My 02 Pathfinder has sat for 3 weeks and of course the battery was dead flat when I went to start it this morning. I removed the positive cable and put the charger on it for the day. The battery seems to have taken a charge which is lucky, I was sure it was going to be frozen solid. However, as soon as I put the cable back on the positive post the alarm sounds, headlights blink and while it will turn over it shows no sign of starting. I suspect it won't until the alarm is cancelled. Pressing the alarm button on the fob has no effect, I will likely need to reprogram that as well. Does anyone have any knowledge of how to cancel the alarm and hopefully get me back on the road?

Many thanks from a frozen wilderness

[Buzzman]

First of all, a disclaimer: I don't have an answer for you.
Having said that, I have the same 2002 Pathfinder Chilkoot, in a similar cold weather location (Ottawa), and I too have experienced dead batteries, a bad alternator, and other stuff that required disconnecting the battery.
Last winter my truck sat in my garage for 3 weeks with the battery disconnected while I had my ECM repaired.
Connecting things back up, or charging my battery while still in the truck, has never been a problem.
One thing I've always done though when charging the battery: I either disconnect it completely (both terminals), or I leave it fully connected in the truck and charge it with a trickle charger.
I've never disconnected just one post. Maybe that had something to do with it????

Keep us posted.

[saskapath]

Cancelling the alarm turned out to be just a matter of locking the door with the key. Seems I have block heater issues too.