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Posted

my c3 will not start according to lexia 3 the bsi unit is faulty the bsi is matched with the engine ecu , the engine ecu is locked and key 1 through to key 5 has come up as not sychronised  when the engine ecu is locked lexia says the bsi unit and engine ecu have not recognised each other i have checked all fuses and wiring everything is ok  will this mean buying another bsi unit ?  

Posted

Welcome to the forum.

 

Did the car work normally before and what happened/occurred last time the car worked such as was it jump started or used to start another car ?

 

You could try a battery disconnection/reconnection since this sometimes helps with electrical problems, failing that I think you may be best to visit a Citroen dealer. The following is copied from the Technical section Common Problems pinned topic:

 

20. Odd electrical problems caused by wrong battery disconnection procedure.

If you need to disconnect the battery and not do a BSI reset procedure, I have found the following has not given me any problems on a 2004 and 2007 C5 and a 2003 C3:

- remove the ignition key from the car

- open the bonnet

- wait a few minutes for the BSI to shut down

- disconnect the battery negative terminal

 

When reconnecting

- ignition key out of the car

- reconnect the battery

- wait a few minutes

- insert the key in the ignition and wait a minute

- turn the key to the first position and wait a minute

- turn the key so the dash lights come on and wait a minute

- start the engine

- take the windows down and up to reset the anti pinch

- reset the clock (and radio on the C3).

Posted

u cant just download the software. As paul has asked what caused the problem in the 1st place. Also are you saying you have 5 keys for the car. i think people might be having a bit trouble making sense of your posting so why not start again and include the following

 

have u owned the car long/ or just bought it.

was it previosly running

what year is it.

are other systems working ok.

what warning lights are you getting.

does your key fob remotely lock/unlock the car

Any other info relating to the car

Posted

Disconnecting a battery at the "wrong" time has the potential to corrupt ECU data. Have I ever actually seen this happen on any vehicle? No. But they say it can!

Posted

i did take the battery off to recharge it as it had been standing for a while then i reconnected it once it was charged by putting the negative lead on first then the positive lead then tried to start it also i only have 2 keys for the car cheers

Posted

The more info you can provide, the easier it will be for us to offer any help. Copied from above posts:

 

have u owned the car long/ or just bought it.

was it previously running

what year is it.

are other systems working ok.

what warning lights are you getting.

does your key fob remotely lock/unlock the car

Any other info relating to the car

what happened/occurred last time the car worked such as was it jump started or used to start another car

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