Winter mode. The purpose of this mode is to enable you to leave the machine for long periods of time with the alarm drawing an absolute minimum current . In this mode the alarm is no longer active and leaves the machine immobilised only....
From the disarmed state , press both buttons on the transmitter for 10 seconds with the ignition on until you hear a bleep,after the ignition is switched off the alarm will go into winter sleep mode..


To remove the battery .
you can remove the battery at any time when the system is IMMOBILISED ONLY or in WINTER MODE.
winter mode also stops the remotes operating the system making this setting better.
press grey button - ignition on - press both buttons for 10 seconds until bleep - ignition off - disconnect battery.

All this taken from my datatool book so I know it's right. hope it helps.