This may help,
MJ2009 with BCM (03xx software)
Encoding VCDS Byte 18 = 04
Lights go out at the tailgate opens NO
Error message MFA Rear fog lamp with Resistance: No
Problem with front parking light (weak light) NO
LED tailgate light up more when braking YES
MJ2010 with BCM from KW22/2009 (Software 0537, 0541)
Encoding Halogen VCDS Byte 18 = 15 Xenon VCDS Byte 18 = 43
Lights go out at the tailgate opens NO Update on 0575 / 6 *
Error message MFA NO Update on 0575 / 6 *
Problem with front parking light (weak light) NO Update on 0575 / 6 *
LED tailgate light up more when braking NO Update on 0575 / 6 *
With MJ2010 / BCM 2011 from KW45/2009 (0573 & 0575 Software / 0576)
Encoding Halogen VCDS Byte 18 = 15 Xenon VCDS Byte 18 = 43
Lights go out at the tailgate opens YES YES
Error message MFA NO NO
Problem with front parking light (weak light) NO NO
LED tailgate light up more when braking NO NO
I used 15 on mine with Halogen bulbs and using 04 gave me weak DRLs under normal circumstances and only full strength DRLs with side lights.