Over 50% of my battery drain problem is down to the Bolero unit whilst this is seems to be the source of many various faults, has anyone solved the problem of “ leakage” or had the unit repaired and if so what is the exact problem ?   It could be leakage or refusal of the canbus to isolate it after.      “ time down”   Thinking of rewireing to ignition only,  anyone see any problems.    It’s the original unit to the car . 

If it is not sending the correct "hand off" signal (I just made that up!) to the canbus gateway it in turn will not shut down and I reckon that is what actually is draining your battery, it happens on that age of vehicle when fitting aftermarket stereos, it shouldnt with a factory Bolero unit but we both think yours is faulty, I think though the drain will be from the Can Gateway controller.

 

If I am correct then wiring it directly to the ignition will not resolve the problem but it costs you nothing but time to try and it will help track down the fault.

I have a spare Bolero which was originally fitted to my 2012 Octavia II. If you are near to Stockport and can pick it up you are welcome to borrow it to test whether it solves your battery drain problem.

 

I do not know what year your car is but I seem to remember that fitting a later model radio to an earlier model car without updating the BCM will result in battery drain as @J.R. has said so it is worth checking that fitting my spare radio will not also drain your battery even though it worked correctly in my car.

Hi chaps, sorry this has been a long time coming and not definitive so far. Having spent much time messing about I still had not come to a conclusion as to wether or not the can bus was operating properly.  On measuring the c’b’ ohms were 65( should be 60 ) and can hi and low appeared to be the same voltage 2.5? V 🤬 Having given up and gone to my local VW specialist they diagnosed the radio as faulty, but did write on the invoice “ can bus OK”🤔.   This does not really tell me if the canbus power and instrument drain is “ normal”      Having now been relieved of hard cash 🙀.  I am noT convinced I learned anything but will leave the radio out completely to see what happens.  Thanks for the kind offer Liger1956 but I will manage without a radios if necessary but if anyone knows of a Bolero fix it would be good, most seem to get binned🫣

Not much to update but when connected to the battery charger and the voltage gets up around 14-14.5 the draining culprits - control for can databus and radio cut off,  followed by instrument cluster wipers/ turn signal fuse being turned off ,   when turning off charger the reverse happens @ < 14v  and drain recommences .  Is there a separate power control to the can bus or is it a body control module fault?  ALL other accessories lighting etc behave as expected    Any thoughts anyone ? 

Removing the radio will have made matter worse, doing that would create a current drain even if none existed before, the Can Gateway will not be able to communicate with the radio to tell it to shut down and will remain open with other modules.

On 21/09/2023 at 17:47, cheshire_cat said:

Having now been relieved of hard cash 🙀.  I am noT convinced I learned anything

 

You have learned that a garage can make good money even when they dont have a clue what they are doing.

9 minutes ago, cheshire_cat said:

Is there a separate power control to the can bus or is it a body control module fault?

 

The Canbus Gateway module communicates with all the nodes and other control modules, if you have physically removed the radio you must delete it from the installation list in the Canbus Gateway module.

What year is ghe car. Any chance the Bolero unit has been updated even though you think original. Have you tried a new canbus gateway. Maybe worth a try... 

Hi, the car is original to me and so no changes to the radio have been made.  I now believe the power control and body control module were combined at about this time. So am going to see if I can get that checked despite it otherwise functioning normally.  Drain is @ instruments- 126mA radio@560+mA ( off) and canbus@ 120mA.  @ 14.5+ volts everything switches off fine it then takes a few days for the voltage tO degrade before it switches them ( only them) back on 🤯

Up date  cleaned the contacts ( about 70) on the onboard controler and the switching now occurs at a lower voltage, 13+    So depends on the length of trip since last engine start and battery voltage also if the radio is adding to the total drain).   @switch off and locking of the car this can be as fast as 10 minutes and alls well.  On 09 model year (  onward )  was the first year the onboard and power control were integrated into one unit “ vehicle voltage control unit”    Does anyone know the “ normal” Bolero drain when switched off?  Before vehicle system shutdown.  Hope this helps someone. 🌝

Update on project sleeping beauty ,   Radio removed and can bus reprogrammed ( both fuse in and out) nothing changed?  Changed and reprogrammed a  replacement can- bus and still the same .   Moving on to body control unit “ 1KO 937 087”. It seems to do every thing it should except turn off the power to instrument cluster and can- bus unless the voltage is high.  I think the system was changed in 09 to a combined body and power control from the earlier 2 ? separate units.  Will any suffix after “087 “ be compatible.  Or do I have to rip the dash apart ?🙀.  Any help gratefully received .