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      11-14-2011, 01:49 PM   #23
swartzentruber
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Quote:
Originally Posted by MysticBlue View Post
I would guess that in testing, under certain circumstances, they ran into window fogging. I could see in humid, rainy conditions at 32, 33, 34 degrees the windows would start to fog up pretty quick.
Interesting theory, but why would that effect be any worse at 37 degrees vs 38? Anytime it's raining (if conditions are right) and A/C isn't running, the car can fog pretty quick. The only additional effect is maybe the fog could ice up, but that would be at 32, not 37.

Frankly I can't see anything at that temp that would be that much worse enough to shut off the system, other than thinking it's easier for the consumer if it shuts off the same time as the icing warning comes on. I guess the engineers might think that the point when icing can happen is also the point when cold start get harder for the battery and risk shortening battery life.
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      11-14-2011, 04:17 PM   #24
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The battery used in start-stop vehicles performs poorly at low temperatures (ability to accept charge is very low) - to prevent the battery from discharging and then not being able to re-start the car, the BMS steps in a shuts down the S/S functionality at low temperature. Annoying, but difficult to overcome this one.
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      11-22-2011, 12:45 AM   #25
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any of you who have this...

Can you think of a reason why you couldn't code/enable it on 335d?
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      11-22-2011, 03:30 AM   #26
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I really enjoy the feature for stop-light laden commutes. I agree 37 seems a bit high to disable the feature, but I'm guessing it's all about efficiency. How much energy does it take to start the car in 37 vs. say 50. BMW Engineers must figure it's simply better to leave it running, disagree, turn off the engine yourself? BTW Anyone notice when you even turn the steering wheel in auto-OFF mode, the car starts up. Pretty intuitive.
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      11-22-2011, 07:37 PM   #27
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37 degrees is where ICE formation might occur on roads according to BMW. So the system is disabled to retain instant power-steering and braking response in an unlikely emergency situation.
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