Heating/A/C - (IHKA)Fan Speed Fluctuates Intermittently
SI B64 04 11
Heating and Air Conditioning
March 2011
Technical Service
SUBJECT
Air Intensity Fluctuates in IHKA Auto Mode Program
MODEL
E60, E61 (5 Series)
Vehicles produced from 3/1/2007 to 6/24/2010
SITUATION
While driving with the IHKA (Integrated Heating and Air Conditioning, Automatic) in auto mode, the air intensity/fan speed fluctuates
intermittently. The air intensity/fan speed can be reduced manually.
CAUSE
The air intensity setting was inadvertently set to an unfavorable setting or there is a software error in the IHKA for the fan characteristic.
PROCEDURE
1. Duplicate the customer concern.
2. Verify that the air intensity setting/fan speed in auto mode was not inadvertently set to an unfavorable setting. If the setting is OK, proceed to step
4
3. If the air intensity was inadvertently set to an unfavorable setting, readjust the intensity setting and review the "Automatic program" section in the
Owner's Manual with the customer. No further action is necessary.
4. Program the vehicle using ISTA/P 2.40 or higher.
Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the latest software.
2010 BMW 535xi Wagon AWD (E61) L6-3.0L Turbo (N54) Page 258
For information on programming and coding with ISTA/P, refer to CenterNet / Aftersales Portal / Service / Workshop Technology / Vehicle
