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Post by vwjap on Dec 17, 2021 21:55:41 GMT
Have you tried doing the wizard in the setup menu?
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goni
New Member
Posts: 45
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Post by goni on Dec 18, 2021 10:49:22 GMT
Yes already did that, its weird because the bar moves when i activate AC or heated seats etc, but they are not listed
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fredu
New Member
Posts: 14
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Post by fredu on Dec 27, 2021 11:56:35 GMT
Hi Don, I've just come across one of your old (2016) posts on another site where you say:
Stuff like charging the battery by directly placing the negative charger lead on the negative battery terminal is a definite no-no as this practice by-passes J367.
The result is that the digital table about the car's SOC is incorrect!
Another no-no is failing to tell the CAN Gateway (and J367) that the old battery has been replaced.
This causes the calculation of System Voltage to use the obsolete history file from the discarded battery!
So, if you do change the battery, make sure that you follow the correct procedure for recording the new battery specifications in the control module tables (there are 3 x adaptation channels that need to be updated).
If you don't buy a BEM replacement battery, at the very least you should change the serial number of the battery in the CAN gateway (which is UDS type for a mk7).
Could this be related to the issue I'm experiencing? Specifically: - When I installed my new battery I updated the 3 adaptation channels; but that's all I did. Does that process automatically delete the obsolete history file and create a new SOC table, or do I need to do that separately.
- Since fitting the new battery I've had to recharge it several times. Where possible I've done this by disconnecting the car's positive from the battery and connecting the charger to the battery positive and the chassis negative (ie: the lug provided for connecting the negative jumper lead). But on other occasions I wasn't able to get mains power to the car so had to remove the battery entirely and charge it at the bench. Which raises the question: Under what circumstances, if any, do I need to re-update the relevant adaptation channels. Every time I charge from an external source, or only when I disconnect from the car completely, or not at all?
I know it's a long shot, but is it remotely possible that what I'm seeing isn't a parasitic drain at all; but simply the car thinking the battery SOC is higher that it actually is and thus not shutting down loads when it should?
Regards,
Fred.
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Post by vwjap on Dec 27, 2021 12:26:53 GMT
Just change the serial number by 1 and it will think it’s a new battery,
But as far as I’m aware it would be the other way round as in overcharging a new battery with old details, as a old battery would need more charge than a new one, if you take the fuse out at night does the battery drain?
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