C4 Picasso 2007 Battery Disconnection

[Melvin]

Hi,

 

Just bought a 2007 C4 Picasso. Battery will need to be disconnected shortly to do some repair work. Any special precautions/procedures before disconnecting and after reconnection? Should there be a code for the radio when reconnected. I have a 3 digit number on the key ring, written with felt pen on a plastic strip, but don't know what it is.

 

Melvin

[paul.h]

Welcome to the forum.

 

The original fit radios on Citroens are coded to the car and do not need a code entering if the battery has been disconnected. If it has an aftermarket radio then that could be different. If you bought the car from a dealer then maybe the plastic strip number is one they used to identify which set of keys went with which car.

 

This is from the C4 Technical section Common Problems pinned topic:

11. 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).

 

In the handbook for the 2015 C4 it says to wait at least 2 minutes after switching off the ignition before disconnecting the battery and when reconnecting, to wait at least a minute after switching on the ignition before starting the engine.