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B-Max uses a smart charging system to try ensure that there is as much power in the battery to start the engine. This can take several hundred amps! And that's why it only defrosts half the screen as any resistive loads are power hungry.
It's a pity it defrosts the passenger side first; this could be a lhd/rhd issue, i've no idea. But it's quite normal in cold weather and there's not a lot you can do about it unless you're more than very competent with auto electrics. My advice is leave well alone.
Are the screenwash jets frozen? If not, get someone to operate the screenwasher while you stand outside the car and you should hear it running. If not, check the fuse as per the handbook.
The pump is situated under the front wheel arch lining if it need changing.
 
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