OK, a pet hate of mine is people asking questions about how to use their vehicle when all they have to do is read the manual...

Well I have speed read the 324 page manual, and gone through the 20 pages of index thoroughly and can find no information on how the door mirrors are switched on to heat, is it temp, on with the rear screen or is there an actual switch or what...?

Page 60 covers door mirrors but no info on heat....?

I've also looked at the workshop manual but can't find mirrors anywhere, I'm probably looking in the wrong place, are they "chassis" "electrical" "general" etc....??

Never had an issue before but the other day the glass was covered in rain drops which would have soon gone had I been able to switch them on....

Cheers.... Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I think mine come on with the heated front screen Pete.

Heating of the exterior mirrors is controlled by the CJB and the respective
door modules, and is active while the ignition is in power mode 6 or 7.
The CJB receives the ambient air temperature value from the ECM (engine
control module) on the high speed CAN (controller area network)
powertrain systems. The CJB converts the ambient air temperature value to
an on-time percentage and transmits it on the medium speed CAN body
systems to the two door modules, which then energize the exterior mirror
heating elements accordingly. The on-time percentage is increased while
the windshield wipers are on.
EXTERIOR MIRROR HEATING TIMES
Ambient Air
Temperature in °C
(°F)
< -10
(<14> 35
(>95)
On-time Percentage 100% 75% 50% 25% 0% 0%
On-time Percentage
With Wipers On
100% 100% 75% 50% 25% 0%
On vehicles with the parked heating function, exterior mirror heating may
also operate when the parked heating function is active, depending on the
ambient air temperature.

I think it's just best to say they come on when necessary  L405 SV Autobiography LWB SDV8, finished in Aston Martin China Grey by ETO division.

Now, THAT’s what you call an answer!

 “If it ain’t broke, don’t fix it” -where’s the fun in that?

think I get it, I need a JCB and a CAN of something, Oh and a stop watch...

Rather glad you put that last sentence in there....

Kevin, that's what I thought...
Gremlin, you're not wrong....

I'm still annoyed it says absolutly nothing about heated door mirrors in the handbook...!! Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

4RRS wrote:

Heating of the exterior mirrors is controlled by the CJB and the respective
door modules, and is active while the ignition is in power mode 6 or 7.
The CJB receives the ambient air temperature value from the ECM (engine
control module) on the high speed CAN (controller area network)
powertrain systems. The CJB converts the ambient air temperature value to
an on-time percentage and transmits it on the medium speed CAN body
systems to the two door modules, which then energize the exterior mirror
heating elements accordingly. The on-time percentage is increased while
the windshield wipers are on.
EXTERIOR MIRROR HEATING TIMES
Ambient Air
Temperature in °C
(°F)
< -10
(<14> 35
(>95)
On-time Percentage 100% 75% 50% 25% 0% 0%
On-time Percentage
With Wipers On
100% 100% 75% 50% 25% 0%
On vehicles with the parked heating function, exterior mirror heating may
also operate when the parked heating function is active, depending on the
ambient air temperature.

I think it's just best to say they come on when necessary

 L405 SV Autobiography LWB SDV8, finished in Aston Martin China Grey by ETO division.