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      03-15-2016, 10:36 PM   #1
satz
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E90 LCI - can I change the "REST HEAT" to control both temps instead?

hi all

my 2009 build 335i sedan with dual-zone climate control has the 'REST HEAT' button. Something which I never use, and never will given the hot temps we always have here

I have read that you can change the function of this button so that it makes both left and right AC temp settings work simultaneously...(like in all Japanese cars I've ever had!)

I found this procedure relating to a 5 series, and was wondering whether it would work on an E90 (or could it cause harm?)

---------------
REST FEATURE
The interior of the vehicle can continue to be heated with the engine switched OFF using
the REST feature of the IHKA. The feature is activated by pressing the REST button on the
IHKA control panel. When activated, the auxiliary water pump and blower motor are
switched on. This feature will remain active for up to 15 minutes or until the coolant
temperature drops below 30OC.

Switching ON requirements for the
REST feature include:
Ignition switched OFF or in KL R
Rest button pressed
Outside temperature <15OC
Coolant temperature > 70OC
Battery voltage > 11.4 volts
Less than 15 minutes after ignition is
switched OFF

Switching OFF conditions for the REST
feature include:
Ignition switched ON - KL15
Battery voltage < 11.4 volts
Rest button pressed while system is ON
Coolant temperature < 30OC
After 15 minutes time period.

When the REST feature is activated in KL R, all of the IHKA functions are operable. This
includes the blower speed, air distribution control and temperature settings.
With the ignition switched OFF, the REST feature is in a preset operating mode. The blower
fan runs at medium speed and the temperature is set to allow maximum heat
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      03-16-2016, 02:32 PM   #2
patents
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Quote:
Originally Posted by satz View Post
I have read that you can change the function of this button so that it makes both left and right AC temp settings work simultaneously...(like in all Japanese cars I've ever had!)

I found this procedure relating to a 5 series, and was wondering whether it would work on an E90 (or could it cause harm?)
I didn't see anything in that procedure that had to do with changing the function of the button. That procedure just explains how the REST feature works.
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      03-16-2016, 02:36 PM   #3
MightyMouseTech
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I believe you can code this with Carly.

Want to enable the rest feature on my 1er. Sounds like it would make a good turbo cool down feature.
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      03-16-2016, 03:44 PM   #4
JustDriveIt
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You can make the ALL button act as a REST button by coding it, but not the other way around unfortunately.
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      03-16-2016, 05:25 PM   #5
satz
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thanks guys.
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