Quote:
Originally Posted by admranger
Thought that the software flash also tells the traction/stability/etc. control systems that you have something heavy behind you (when you plug into the 7pin connector, that is). Helps when the trailer tries to wag the X5, etc.
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I think that is an internet rumour. Other BMW models (like the E53, and the current X3) get the trailer stability control, which is programmed in the DSC system and not the lighting module, without any module reflash (this is specifically referenced in the TIS instructions). They are using the same DSC design, but likely have different parameters. Several posters have referred to the risk of it not working without a reflash, but that doesn't seem logical to me, since the only thing the reflash does is tell the vehicle the trailer lighting module is installed. We can determine if that works, and the module is visible to the system, if the PDC goes off automatically.
All that said, in my years of towing the trailer stability control has never intervened on either my E53 or my E83. That includes towing through the Rockies on snow-covered roads. I would expect to see the DSC lights come on when it does, same as when DSC intervenes without a trailer. I am glad I have it there, but it isn't in play in normal driving when towing, IMO.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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