[carconvert]

So I took my car in for a service recall this month... had something to do with Digital Engine Electronics errors. After service I noticed that the auto start-stop function is now always enabled even if the outdoor temperature is below 3 degrees. Just wondering if my fellow Canadians or anyone else with recent service living in colder climates has noticed this... Thanks

[giddyup69]

sorry... u kind of lost me. what do you mean affected by outdoor temperature?

the way mine worked was that it used to be on by default when i started my car so i would have to manual shut it off. i have it coded now to be disabled on start-up.

how did yours used to work? are u saying that yours used to change functions with outdoor temperatures??

[carconvert]

Previous to the service visit, my auto start-stop wouldnt work unless the temperature was above 3 degrees. After service, temperature is no longer a determining factor...

Originally Posted by giddyup69

sorry... u kind of lost me. what do you mean affected by outdoor temperature?

the way mine worked was that it used to be on by default when i started my car so i would have to manual shut it off. i have it coded now to be disabled on start-up.

how did yours used to work? are u saying that yours used to change functions with outdoor temperatures??

[giddyup69]

sorry, i have no clue. i never even knew that outside temps would influence the ass. maybe someone else knows.

[Zulbat]

According to the sales brochure the ass is not supposed to be on before engine is warm to prevent too many cold starts and to get engine up to temperature faster.

Do you use some type of engine heater connected to the car when it's cold?
Otherwise it's strange.

[steve@codemybimmer]

You must've gotten a software update and that probably caused it to change. If that's the case, any 2014 model should also behave this way.

Can anyone confirm?

[CHCCubs]

The ASS function in my 2013 has always worked that way. I've had it engage at temps as low as -20C.

[carconvert]

Nope Zubat, no engine heater here... just always parked in my garage which isn't heated.
Yeah, Aritauras -- I'm leaning towards the software update as well...

According to BMW as per below... auto start-stop is affected by outside temp below 3 degrees

"There are numerous vehicle parameters that are monitored as a part of the stop/start function to ensure the driving experience is not impacted. As many of the factors are not possible to monitor it may appear that the feature is not working. Reasons why the stop/start may not shut down the engine include:
The car is coasting (manual transmission)
Brake vacuum reading is too low (manual transmission)
Insufficient brake pedal pressure is being applied to hold the vehicle stationary (automatic transmission)
Stopping on a hill/downhill with a 12% or greater gradient
If the steering angle is more then 6 degrees
If the steering wheel is still be moved after approximately one second of coming to a stop
The system has not yet be activated by going over a speed of 5mph for automatics, 3mph for manuals since the last engine switch off
If the gas pedal is being pressed (engine must be at idle speed only)
You're coming to a stop from reverse
The driver gets out of the car
If Hill Decent Control (HDC) is activated
If the engine is not up to temperature
If the carbon canister is being purged
if the grade of the fuel is too low for the engine
Transmission adaptation is active (automatic transmission)
The hydraulic pressure accumulator is not yet up to pressure (automatic transmission)
Stop-and-go traffic - system is only activated by driving over 5mph for automatics, 3mph for manuals
Batter charge is low
Outside temperature is colder then 37.4 F / 3 C
Outside temperature above 95 F / 35 C and the air conditioning system is on
Fogging of the windshield is detected by the IHKA system
Climate control system is on but passenger compartment has not yet reached desired temperature
ABS system was used when coming to a stop"