Immobiliser/central Locking

[jazzer109]

C5 diesel estate 06 reg. Every time i switch off, the hazards come on for a couple of minutes and the car locks me in or locks me out.The key no longer operates the central locking remotely(neither does the spare) Sometimes the car wont fire.I am baffled, i have tried re-setting the key (perhaps wrongly) and disconnecting the battery for a couple of minutes.Any help would be greatly appreciated .

 

Pat

[citrophile]

Hi Jazzer

Welcome to the forum.

Sounds like an electrical system problem, possibly due to battery issues. The C5 can be very temperamental when the battery is disconnected and then reconnected too quickly.

There is a specific (some would say "strange") sequence for reconnection of the battery on a C5 which allows all the various computers and control modules to wake up sensibly!

Try this process (courtesy of John Douglas)

 

CORRECT REBOOT PROCEDURE FOR BSI

Put the driver's window down, lift the bonnet and ensure all equipment is switched off.
Ensure all doors are closed and remove key from the ignition.
Wait for 3 minutes, disconnect the vehicle battery and wait 15 seconds.
Reconnect the vehicle battery, wait a further 10 seconds (do not open doors.).
Switch on the side lights through the driver's window.
Switch on the ignition and check system's functionality.
Hold lock button on key down for 10 seconds.
Remove key open & close door test central locking system.
Start the engine and complete the system's check.

Reset the clock and date.
Failure to follow this procedure could result in incorrect operation of many BSI related items.

 

Good luck, let us know how you get on.

 

Rob

Edited July 7, 2014 by citrophile

[paul.h]

This is the procedure you could try to synchronise the keys:

 

4. Synchronise the high frequency remote controls

Perform the following operations :

• 1 - Switch off the ignition and take out the key
• 2 - Wait 1 minute without pressing the buttons of any remote control
• 3 - Place the key of the high frequency remote control to be synchronised in position "ignition+"
• 4 - Within 10 seconds, press the locking button for 5 seconds
• 5 - Switch off the ignition and take out the key
• 6 - Repeat the procedure with the other keys from point N°3, otherwise move on to point N°7
• 7 - Wait 30 seconds, the remote controls are synchronised

Carry out a locking / unlocking test of the vehicle’s doors and tailgate.

N.B. : If the test for locking/unlocking of doors and tailgate is not correct, recommence the synchronisation operations for all the ignition keys that have a high frequency remote control.