Mercedes Benz E 550 4MATIC Sedan Technical Service Bulletin # LI83-00_P-050296 Date: 120326
A/C - DTC 90A207 And Significant Temperature Differences
Significant temperature differences between driver and passenger side
Topic number LI83.00-P-050296
Version 1
Design group 83.00 General
Date 03-26-2012
Validity Model series 207 up to production date 31.08.2010 (Bremen plant)
Model series 212 up to production date 27.08.2010 (Sindelfingen plant)
Model series 212 up to production date 31.10.2010 (China plant)
Reason for change
Complaint:
Significant temperature differences between driver and passenger side.
Fault code 90A207 in AAC control unit (The actuator motor for the left blend air flap has a malfunction. There is a mechanical fault).
Cause:
Faulty software in AAC control unit.
The stepper motor can continue to be used without having to be removed/replaced.
Remedy:
Flash AAC control unit with new software (software no. A212 902 8603 or SW_10/16_03 or higher).
CAUTION:
For model series 207 this new software is only available in the field as of add-on 1882 (for DVD 05/211) or add-on 1884 (for DVD 07/201).
Symptoms
2010 Mercedes Benz E 550 4MATIC Sedan (212.090) V8-5.5L (273.970) Page 81
Control unit/fault code
Work units
