Preconditioning issues - Low battery warning - Page 2

mrlossyman · Nov 27th, 2017, 18:21

OK this is really odd. I tried to start precon using the app and when I got to the car it said the usual could start precon low battery. So whist sat in the car I set a precon timer for 5 mins time. I turned off the ignition and open and closed the door. Whilst in the car the precon started perfectly and ran perfectly on the timer with no battery warning.

I'm now wondering if this is an app connectivity issue and would be grateful if someone could try starting precon by the app. I use android.

It seems the battery isn't the issue.... However start stop never works...

nu11eaf · Nov 27th, 2017, 18:33

Quote:

Originally Posted by mrlossyman

OK this is really odd. I tried to start precon using the app and when I got to the car it said the usual could start precon low battery. So whist sat in the car I set a precon timer for 5 mins time. I turned off the ignition and open and closed the door. Whilst in the car the precon started perfectly and ran perfectly on the timer with no battery warning.

I'm now wondering if this is an app connectivity issue and would be grateful if someone could try starting precon by the app. I use android.

It seems the battery isn't the issue.... However start stop never works...

Try putting an amg charger on overnight, that gets my stop start working again when it no longer works, so it might sort out your preconditioning as well.

mrlossyman · Nov 27th, 2017, 18:37

Quote:

Originally Posted by nu11eaf

Try putting an amg charger on overnight, that gets my stop start working again when it no longer works, so it might sort out your preconditioning as well.

Unfortunately I don't have a charger. My start / stop only works after I've done a 500mile round trip and then within a day or two stops working again.

Deman77 · Nov 27th, 2017, 18:43

Perhaps you just found a bug in software that allows you to bypass low charge restriction. Precon is definitely a charge negative activity as alternator is not firing and it’s not a self sustained burn. So I would not try to force it. The car is designed to save us some battery juice until the engine starts. Cold car is better than bricked car. They could have some problems with systems shutting down correctly. I remember people had problems like faulty switchboard or air compressor drawing current in early cars. Volvo used to try and establish what was drawing current leaving car overnight on monitoring equipment.

Mine is going for stopstart fix tomorrow. Third time in the last three months. It was rejuiced and reset just three weeks ago then tested on the day to confirm that ss worked then two days later ss didn’t work for me and this weekend car was in standby after just three days of idling. It used to take well over a week. I would be shocked if these issues are not all related as battery low charge would be leading to both.

Deman77 · Nov 27th, 2017, 18:45

Quote:

Originally Posted by mrlossyman

Unfortunately I don't have a charger. My start / stop only works after I've done a 500mile round trip and then within a day or two stops working again.

I wouldn’t be surprised if one day MOT gets an item to test stopstart. We would be failing. I would insist on fixing it.

Lexman8 · Nov 27th, 2017, 19:22

Quote:

Originally Posted by mrlossyman

I'm now wondering if this is an app connectivity issue and would be grateful if someone could try starting precon by the app. I use android.

I use Android (version 8) and successfully started precon twice on Saturday using the app. I'll check if it works okay tomorrow.

nu11eaf · Nov 27th, 2017, 19:26

Quote:

Originally Posted by Deman77

I wouldn’t be surprised if one day MOT gets an item to test stopstart. We would be failing. I would insist on fixing it.

There is a very good possibility of that as the Co2 emisions are based on the fact the car uses stop start technology.

nu11eaf · Nov 27th, 2017, 19:35

Quote:

Originally Posted by mrlossyman

Unfortunately I don't have a charger. My start / stop only works after I've done a 500mile round trip and then within a day or two stops working again.

I invested in a C-Tec mxs 7.0 battery charger, its a great charger but we should not have to be charging batteries on new cars, but it gets SS working again. The SS support batteries are only small, about 11 A/hr, not man enough for the job if doing lots of small journeys.

KNVXC90 · Nov 27th, 2017, 19:58

Quote:

Originally Posted by nu11eaf

The SS support batteries are only small, about 11 A/hr, not man enough for the job if doing lots of small journeys.

I don't believe its a battery capacity issue. My XC90 does mostly short journeys too but stop/start works fine.

nu11eaf · Nov 27th, 2017, 20:17

Quote:

Originally Posted by KNVXC90

I don't believe its a battery capacity issue. My XC90 does mostly short journeys too but stop/start works fine.

Must be my battery then as ss works ok after charging up, I know there is a support battery capacity % were the ss does not work as my dealer service dept lowered my % setting and said it was set too high and ss would not work if battery dropped below that, think it was set for 80% capacity before they lowered it. SS only lasted a a week or two after getting it back.

Nov 27th, 2017, 18:21	#11
mrlossyman Senior Member Last Online: Apr 2nd, 2021 09:08 Join Date: Aug 2011 Location: London	OK this is really odd. I tried to start precon using the app and when I got to the car it said the usual could start precon low battery. So whist sat in the car I set a precon timer for 5 mins time. I turned off the ignition and open and closed the door. Whilst in the car the precon started perfectly and ran perfectly on the timer with no battery warning. I'm now wondering if this is an app connectivity issue and would be grateful if someone could try starting precon by the app. I use android. It seems the battery isn't the issue.... However start stop never works... __________________ XC90 2017 D5 RDesign (Sept) Bursting Blue, Bowers, Xenium, BLIS + CTA, Winter HUD, Family Pack, Aux Heater, Carbon, Full Leather, Rubber Mats, 3 pin 240v

Nov 27th, 2017, 18:43	#14
Deman77 Master Member Last Online: Apr 1st, 2022 14:14 Join Date: Jan 2016 Location: Greater London	Perhaps you just found a bug in software that allows you to bypass low charge restriction. Precon is definitely a charge negative activity as alternator is not firing and it’s not a self sustained burn. So I would not try to force it. The car is designed to save us some battery juice until the engine starts. Cold car is better than bricked car. They could have some problems with systems shutting down correctly. I remember people had problems like faulty switchboard or air compressor drawing current in early cars. Volvo used to try and establish what was drawing current leaving car overnight on monitoring equipment. Mine is going for stopstart fix tomorrow. Third time in the last three months. It was rejuiced and reset just three weeks ago then tested on the day to confirm that ss worked then two days later ss didn’t work for me and this weekend car was in standby after just three days of idling. It used to take well over a week. I would be shocked if these issues are not all related as battery low charge would be leading to both. __________________ XC90 D5 P* MY16 BMW i3

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