GolfGTIforum.co.uk
Model specific boards => Golf mk7 => Topic started by: Mike J on 31 January 2024, 10:50
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In Nov 2023 I replaced the battery on my Mk7 2litre TDI.
The battery suppliers advised me to have the car recoded to the new battery so I took it to my regular service garage and they reset all the codes in a few mins.
I have since been told that the each battery has a special code and the old code should be changed to the code of the new battery.
Can anyone give me advice on this please.
Local VW dealers have quoted £170.
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The new battery needs to be coded in so the battery regulation system then knows its charging a new battery.
Its easy enough to do with either VCDS or OBDeleven.
http://wiki.ross-tech.com/wiki/index.php/Battery_Replacement
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Many thanks 🍻
My next step it to get it done without it costing me a small fortune.
.
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Many thanks 🍻
My next step it to get it done without it costing me a small fortune.
.
Here is an old thread I did on the procedure for my MK7...
https://www.golfmk7.com/forums/index.php?threads/how-to-retro-fit-a-bigger-capacity-battery-to-a-mk7-golf.320084/
The VCDS info....
VCDS coding required
From the Main screen:-
Select Control Module [Select]
[19-CAN Gateway]
Advanced Functions screen:-
[Adaptions-10]
New value choice screen:-
Change the following four channels, inputting the relevant data about the new battery.
IDE03256-MAS06105-Battery adaptation-Rated battery capacity
IDE03256-MAS06106-Battery adaptation-Battery technology
IDE03256-MAS06107-Battery adaptation-Battery manufacturer
IDE03256-MAS06108-Battery adaptation-Battery Serial Number
When you click on "Battery technology" (using VCDS 21.3.0) a drop down list appears with the following options (= actual meaning):-
Wet = Standard Lead Acid
Fleece = Standard A.G.M.
Wickel6V
Wickel12V
Ultracap
Gel = Standard Gel Lead Acid
Lithium ions = Standard LiFePO4
EFB = Standard E.F.B.
Binary - AGM = "Bipolar" A.G.M. type
EFB+ = E.F.B. "Plus" type
Not_assigned_10
Not_assigned_11
Not_assigned_12
Not_assigned_13
Not_assigned_14
Unknown
According to various sources of information, including numerous car scans & threads on Ross-Tech, "Fleece" is for standard AGM batteries, "EFB" is for standard EFB batteries, & "Wet" is for standard lead acid batteries, as these settings are used at the factory. The setting of "Binary - AGM" is apparently for specialist "Bipolar AGM" batteries! Also the drop down list is from VCDS & not generated by your car's BCM, therefore, your car may not support all the options on the list, & the BCM will reject the value when you tell it to accept it!
Battery BEM codes are now redundant with the above separate channels. The most important channels are:- Rated battery capacity, Battery technology, & Battery Serial Number. For the Battery Serial Number, just change one digit of the old one. This channel tells the BCM that a new battery has been installed & to relearn the new battery & forget any “learnt values” for the old battery!
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Thats an excellent guide, not seen that before.
Re the battery serial number i usually code this as the date of fitment ie, 06022024 if it needs extra digits to comply just fill up with 0's. :smiley: