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[ubuntupunk]

The radio was left on overnight. Not sure why it didn't auto turn off. So battery is flat. Tried to jumpstart this morning but no luck. There are five square blocks showing on the display LCD which I've never seen, can't find any references to what they might indicate. Any clues?

[CrazyG]

ok...firstly we need to know the following before we can give some thoughts/suggestions
of how to resolve your problem..
1/ what engine size is your 454 ?
2/ is it manual or AMT transmission ?
3/ you say 5 'blocks' showing in the LCD display ?  That sounds like what one would
    see for the fuel level.   Please explain where on the LCD display you see that,  or....
    take a picture with your mobile phone, then Bluetooth it to you computer and reduce it
    in size to 800x600 pixels using a photoshop type editor, and you can then attach it to
    your reply by 'adding' it using the 'Additional Options' that is shown below and to the
   left of the 'box' where you make a post on the Forum.

[ubuntupunk]

Thanks for responding and my apologies for not checking sooner.

It's a https://www.ultimatespecs.com/car-specs/Smart/5672/Smart-Forfour-(W454)-13.html Passion 1.3 2006.

Good news is I managed to get it running again.

The battery was very run down, and taking it out and using a pulse charger and leaving overnight on charge, fixed the problem, which I thought was the immobilizer, who knows, I have heard that you can reset the computer this way too.

Now I confronted with the broken keyfob which has a missing copper pcb pad and one of the smd resisters is off the pcb, and of course the rear perspex window which I had to dremel to gain access to the vehicle. (No central locking access via left side door, cable is gone!)

Anyone here with a circuit diagram of the two button fob?