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Old 12-15-2010, 12:04 PM   #1
sski
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How well do your heated mirrors work?

I had the X3 at Maranello a few weeks ago for some service and asked them to check the heated mirrors...they came back "normal function".

Well I just got a rather short message from my wife: "my heated mirrors don't work!!!" As I understand it they have sensor's and turn on automatically. We have a Honda Pilot before the X3 and it had a switch for the mirror heaters. The mirrors could be filled with snow/ice, you'd flip the switch and they would be clear in a few minutes. I think she probabaly got all the way to work with the X3 and never had proper use of the side mirrors.

Do your side mirrors clear up pretty quickly and mine obviously have a problem or does BMW just have crappy heated mirrors?
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Old 12-15-2010, 12:10 PM   #2
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in my e30 the heated mirrors are always heated with the car running. There is no micro switch to activate or deactivate the heat to the mirrors. have to remember it is -10 out so they may take a wee bit longer to defrost. We live in an age where we want everything yesterday...
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Old 12-15-2010, 01:24 PM   #3
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She was out for about 10mins, went to back into a spot and there was no evidence the mirrors were even thinking about clearing, she had to get out and brush out the mirror. Ya, I know it's not the end of the world but again her old Honda would have cleared by then.
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Old 12-15-2010, 03:22 PM   #4
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Myabe it comes on when the front defroster is on.
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Old 12-16-2010, 06:07 PM   #5
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I'm not sure about the newer models, but i know on the E36 the mirror's heat stays on as long as the car is on.

It's obvious when it's on because the mirror is significantly warmer, you can feel it with your hands. I always thought it was knid of inefficient that there wasn't a switch to control the mirror's heat.
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Old 12-18-2010, 12:16 PM   #6
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don't E36 heated mirrors switch on when the +3 degrees OB indicator tune comes on?
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Old 12-18-2010, 06:10 PM   #7
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Third party information:

Quote:
Mirror Heating Information for 1997 and up BMW's

Mirror heating is individually controlled by the computer modules in each front door - following a program that uses the outside temperature as reported from the OBC. Power is applied in 4 different stages (percentages of time) to give 4 different degrees of heating - all according to temp.

Temp Range % of Time
below -10C 100% (totally on)
-10C thru 0C 75%
0C thru 15C 50%
15C thru 25C 25%
above 25C 0% (totally off)

There is no manual control of their operation.

Also - the washer nozzle heating is controlled in a similar way - but there are either on or off (single stage). They start to heat when the temp drops to +3C (same time as you get the "freezing temp" alert message). They turn off when the temp climbs to +6C.

Both these heating functions, like many other non-essential functions, will be shut down if the battery voltage falls too low (below 11.4) and will not be re-activated till the voltage goes to about 12.2.

Note - if you loose the temperature sensor for the OBC, the reading defaults to -40, at which time your mirrors and nozzles will be stuck in full heat mode (using power).
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Old 12-19-2010, 02:21 PM   #8
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Firstly on my current e30 and both of my e36's the heated mirrors worked awesomely. Probably the best out of the 20 or so cars I've owned. Including a Honda Accord.

On the e30 the heated mirrors are turned on by turning on the rear defogger. So in a way there is a switch.
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Old 12-20-2010, 01:35 PM   #9
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Quote:
Originally Posted by Qube View Post
Third party information:
Mirror Heating Information for 1997 and up BMW's

Mirror heating is individually controlled by the computer modules in each front door - following a program that uses the outside temperature as reported from the OBC. Power is applied in 4 different stages (percentages of time) to give 4 different degrees of heating - all according to temp.

Temp Range % of Time
below -10C 100% (totally on)
-10C thru 0C 75%
0C thru 15C 50%
15C thru 25C 25%
above 25C 0% (totally off)

There is no manual control of their operation.

Also - the washer nozzle heating is controlled in a similar way - but there are either on or off (single stage). They start to heat when the temp drops to +3C (same time as you get the "freezing temp" alert message). They turn off when the temp climbs to +6C.

Both these heating functions, like many other non-essential functions, will be shut down if the battery voltage falls too low (below 11.4) and will not be re-activated till the voltage goes to about 12.2.

Note - if you loose the temperature sensor for the OBC, the reading defaults to -40, at which time your mirrors and nozzles will be stuck in full heat mode (using power).
What you posted definately explains it then. My temp sensor broke off a while ago and i've been lazy with replacing it. I guess that's why my Mirrors were on fire even in the summer time.

Guess i have a reason to fix it now besides seeing -37c on the OBC.
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Old 12-20-2010, 02:41 PM   #10
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My OBC reads outside temp properly. I checked the other day and the mirrors were stone cold. Maybe elements are burnt out??? I'm under warranty until Feb. 2011, so I'll just bring in, in Jan. and actually have a service advisor take a walk out to the car with me a feel the mirrors. I would have been on road about 45mins by then. It should be pretty simple to track down the problem...Sensor works - yes/no, power getting to the mirrors - yes/no, element heating up - yes/no...
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Old 12-20-2010, 03:48 PM   #11
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Take the mirrors off, check for current at the connector. If yes, they're probably working, if no, its wiring.
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Old 12-20-2010, 08:02 PM   #12
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Quote:
Originally Posted by dble Trouble View Post
Firstly on my current e30 and both of my e36's the heated mirrors worked awesomely. Probably the best out of the 20 or so cars I've owned. Including a Honda Accord.

On the e30 the heated mirrors are turned on by turning on the rear defogger. So in a way there is a switch.
You sure dude? I've never seen an E30 work this way... Mine is always on (I guess as soon as the ignition is switched on) and I especially hate it in the summer. It is almost so hot it burns your fingers.
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Old 12-20-2010, 10:19 PM   #13
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^^No I'm not sure, I just figured since if I leave my rear defogger off then the mirrors stay frozen, when I turn it on, they start to defrost.......I thought I was being pretty logical there. My other e30 behaved the same way. The e36's though, would defrost regardless of on or off.
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Old 02-10-2011, 05:25 PM   #14
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Update...after three trips to the dealer I find out the car does NOT have heated exterior mirrors. I'm like..."what?!"

Apparently, it has some warm weather package so it has a enhanced A/C system but no heated mirrors. I assumed it would simply be standard equipment.
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Old 02-10-2011, 06:39 PM   #15
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Quote:
Originally Posted by sski View Post
Update...after three trips to the dealer I find out the car does NOT have heated exterior mirrors. I'm like..."what?!"

Apparently, it has some warm weather package so it has a enhanced A/C system but no heated mirrors. I assumed it would simply be standard equipment.
That's pretty funny (or not) since previously they came back to you with "heated mirrors functional" test.
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