View source for MLB based Acc/Start Auth (J393) BCM2

__FORCETOC__
This page applies to Address '''05-Acc/Start Auth.''' MLB based models such as the VW '''Touareg''' (7P/BP) and Audi '''A4''' ''(8K)'', '''A5''' ''(8T)'', '''Q5''' ''(8R)'' in addition to the '''A6/A7/A8''' ''(4G/4H)'' models with  J393 Component: '''BCM2 1.1''' and '''BCM2 2.0'''.  It does NOT apply to MLBevo models using Component BCM2 MLBevo.

The installed BCM2 can be identified by evaluating the data in the Auto-Scan: 

  Address 05: Acc/Start Auth. (J393)       Labels: 8K0-907-064-05.clb
      Part No SW: 8K0 907 064 DG    HW: 8K0 907 064 DG
      Component: '''BCM2 1.1'''      H02 0321

 Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
    Part No SW: 4H0 907 064 BR    HW: 4H0 907 064 BR
    Component: '''BCM2 2.0'''      H31 0330


== Information ==
This control module is the Immobilizer (KESSY) and it uses Address words 05- Acc/Start Auth. (J393) in addition to Address 46-Central Conv. (J393).
Replacement of this control modules will result in Immobilizer problems in addition to Component Protection (CP) DTCs which cannot be resolved using VCDS. See the [[MLB based Acc/Start Auth (J393) BCM2#Replacement | Replacement]] section below.

== Coding ==
Coding information is available while connected to the vehicle with VCDS using the '''[http://www.ross-tech.com/vcds/tour/recode_screen.html Long Coding Helper]'''.


== Replacement ==
[[Immobilizer]] component matching and Component Protection can only be learned/disabled using the Factory Tool in Combination with an online Connection with GeKo access.  This can be completed online at the dealer or by using a Pass-Thru (J2534) device per the notes on our [[Official Factory Repair Information]] page.