Flat battery need to open D3 with door key

[ade]

Is the horn fuse the one to remove when/if the alarm goes off?
Thanks

[AnD3rew]

Should just be able to put the key in the ignition and it should turn off.

[WhiteD3]

If the battery is flat then the alarm won't sound..........

[AnD3rew]

If the battery is flat then the alarm won't sound..........

Depends if it is car battery or key battery that is flat;)