found battery drain anyone know the cure
 

as i posted before i purchased a cdt tourer as a donor car but decided to work on it and hopefully put it on the road one of the jobs needing done was a battery drain what i've noticed is the bonnet and tailgate light on the dash stays on when bonnet and tailgate is closed i would appreciate very much if anyone could point me in the right direction as to what the fix is thank you in advance::icon_cry:

Checking the bonnet switch is operating correctly would be the first thing I would do - they are known to play up on occasion. :xmas-smiley-008:

Thanks for replying colvert no the lights go of when ignition is offthe just stay on when engine is running

That would mean that the bonnet is not closing fully and or the bonnet switch is in need of attention, check that the rubber cover over the switch is fully located in its fitting, if needed remove it and spray the switch with WD-40 or electrical contact cleaner, refit.

Will get it checked today thank you

If they go out ignition off they can't really be classed as a battery drain, if they are on with engine running, the miniscule amount of current used to light an LED is insignificant.


The switches themselves don't turn the lights on or off they simply provide a signal to the central locking that something isn't closed fully, so as others have mentioned the problem is possibly with either of the switches, the bonnet is the favourite.


When this happens, also if any other door or doors are not fully closed you should get a warning beep of the horn when you try to lock the car, does this happen ?


From memory and I stand to be corrected, the switches can be by-passed by removing the multi-plugs and the two terminals connected, if this is done and the lights do the same this suggests wiring / control problems.

as mentioned in the comments above, the bonnet/tailgate open warning won't be causing any battery drain, as that warning only appears on the cluster when the ignition is on.

You should hear a beep from your alarm sounder (either a horn sound or a alarm tone if you have the BBUS alarm system when you lock the car as it's alerting you that it thinks either the boot or tailgate is open.

Annoyingly the IPK doesn't specify if it is the bonnet or the tailgate it thinks is open, but normally it's the bonnet as the bonnet switch gets water in it and stops working.

The only common cause of battery drain I can think of is if you have the highline sat nav head unit system the satnav drive in the boot not powering down when you switch off the car is a common issue. The drive will just stay on permanently spinning the disk, which is enough to drain the battery in a few days. I've come across electrics getting wet causing battery drain before as well.

Also check the condition of your battery, as I had one once that would no longer hold a charge very well, so although it would show 12v after charging, it would dump all the charge out overnight.

thanks Rick-sta for your reply if i disconnect the battery it lasts for a few weeks but left connected it only lasts a few days i had been leaving the bonnet just closed in the first position without fully closing which i thought could be the drain but when closing fully it is still draining i will certainly be looking into the sat nav thanks again