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Danwilderspin



Member Since: 15 Jun 2016
Location: Cambridgeshire
Posts: 2180

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zermatt Silver
Hot mirror glass

Is it normal for the drivers mirror glass to be nearly too hot to touch all the time? Just touched it to get something off and noticed it and it’s cold today... any ideas Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Post #556653 6th Jun 2020 11:47am
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stu1



Member Since: 06 Dec 2013
Location: UK
Posts: 276

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Java Black

From the workshop manual:

Heating
Heating of the exterior mirrors is controlled by the GEM and the respective door modules, and is active while the ignition switch is in position II.
The GEM receives the ambient air temperature value from the instrument cluster via the K bus. The GEM converts the ambient air temperature value to an on-time percentage and transmits it on the P bus 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.


Then there's a table which indicates the percentage of max heating doesn't hit 0 until the external temp is greater than 25°C (unless the wipers are on in which case it's greater than 35°C).
-10 = 100%
-10 to 0 - 75%
0 to 15 - 50%
15-25 - 25%

HTH!

Post #556676 6th Jun 2020 2:39pm
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