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Re: Don't Worry-Transmission Selector Light (archive)

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Posted by Jeff H on August 11, 1999 at 00:01:39:

In Reply to: Re: Don't Worry-Transmission Selector Light posted by Jim Cash on August 10, 1999 at 11:16:28:

One drawback I have found to BMW's computer system is that it appears to save all control settings (fan setting, Air cond on or off, etc.) upon going to sleep. If you park the car for less than 16 minutes, which I do every morning when droping my daughter off at day care, the settings revert to what they were the last time the car went to sleep. In my case, this was the previoue eveining. So I return to my car each morning after day care dropoff and my air cond is on again and the fan is at full plast. This is rather anoying, but I have not found any way around it.

Anyone found a way to force the computer to save settings in memory / put the car to sleep sooner than 16 minutes?

99 528iA

: This light is an indicator that the car is "awake".

: Many of the body control functions (locks, windows, sunroof, interior lighting, seat movement,etc) are controlled by a series of computer modules - all under control of the "General Module".

: These all communicate with each other across the digital bus - and that takes power - not a lot, but enough that you do not want to retain this operation while the car is parked for a long period.

: Soooo - there is also a "sleep" mode during which the computers basically shut down, except for a monitoring signal that goes around at a much reduces sampling rate. As soon as you open a door, the trunk, hit a remote key button, turn on an interior light, etc. this activity is detected and the system goes back into "Awake" mode.

: The Awake mode lasts for about 16 minutes as long as there has been no further activity in that period.
: When it goes to sleep it also shuts off any interior lighting that has been left on (glove box, map light trunk light), signals other functions to also shut down - like the little fan that vents the cabin temp sensor in the Climate Control unit.

: This "Sleep" mode is also called the "Consumer Off" mode - since it shuts down power to those things that "consume" power. Basically a battery protect feature.

: I think the light on the shift console is just to provide an indicator of this mode - probably more useful for someone doing fault analysis than for everyday use. I do not know if there is a similar indicator on the manual transmission cars.

: Hope that helps


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