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Discussion Starter #1
I went to my car the other day and the key fob couldn't unlock the car. Nor
could I start it. I tried the other key fob and that didn't work either. Both key fobs have been used recently. I had to unlock the doors using the key (the manual method). A day later, I went and tried again and everything worked as normal (unlocked/locked the doors with the key fob, started the car but I never drove it). Later that day, I tried again and all the electrics were dead again (couldn't electronically unlock the doors, couldn't start the engine). It's still dead now. The interior light doesn't come on, nor do the sidelights. There had been no indications of a weak battery up until then (car wasn't struggling to start in the cold etc). Any suggestions appreciated. Thanks.
 

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I'd say it's the battery. I recently had to replace the battery on my 308. No signs of battery issues, started up fine every time. Got in the car to come home from work one day, car started fine as always. Half way home the dashboard lit up like it was christmas and loads of error messages on the screen.

Got home and connected the diagnostics. Lots of errors. Cleared them all and decided to drive round for a while to see what would happen and it wouldn't start. Engine barely turned over and then the lights all went dim. Luckily I live on a slight hill so rolled it down and bump started the car. Drove to get a battery and all has been good since.

Batteries usually have a working life of 4 years so if your car is older and on the original battery then that definitely puts it at the top of the list of possibles.
 

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Thanks for the replies.
I'm beginning to think it may be the battery too. I went to do some investigations and removed the positive lead from the battery and noticed that when I reconnected it, about half the time, the car would spring to life (electrically speaking - the side lights would come on as I had left them switched on so that I would know if anything was happening) and half the time, there was no sign of life and all I was doing was moving the positive lead (yeah, I know that could mean there's a fault in the lead). Does anyone know if there is some circuitry that detects the battery strength and if it is deemed too weak, then it refuses to switch anything on?
BTW, I don't remember ever having replaced the battery and I've had the car for 10 years.
If I went to a garage for a new battery, can they test the old one first to make sure that's where the fault really is?
 

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If it's 10+ years old then I'd say there's no need to check it - it's dead, expired, shuffled off this mortal coil and gone to meet it's maker. Any battery supplier asked to check it would probably take a look at the date code, shake their head, make tutting noises and say it needs replacing anyway.

The BSI monitors the battery and if the state of the battery gets below a set level it puts the car into ECO mode which is designed to shut down all unnecessary electrical circuits to try and preserve enough charge in a decent battery to enable the car to be started next turn of the key. Thins like hazards & door locking would still be working if the battery was capable.
 

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I went to do some investigations and removed the positive lead from the battery and noticed that when I reconnected it, about half the time, the car would spring to life (electrically speaking - the side lights would come on as I had left them switched on so that I would know if anything was happening) and half the time, there was no sign of life and all I was doing was moving the positive lead (yeah, I know that could mean there's a fault in the lead).
You are playing with fire by removing and replacing the positive terminal without allowing the BSI to go to sleep or do a soft wake up. You could end up corrupting the BSI/ECU. You MUST follow the procedure here to prevent this from happening... http://www.peugeotforums.com/forums/maintenance-9/procedure-battery-dis-connection-3-minute-rule-5228/

My money is on the battery being faulty too. Any half decent battery retailer will be able to load test your current battery to check if it is up to scratch.
 
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