S 550 (221.171) V8-5.5L (273.961) (2007)
Central Control Module: All Technical Service Bulletins
Computer/Controls - Upper Control Panel Cont Unit Faults
Functional defects after installation of upper control panel control unit YoM 09/01 in vehicles with code 806 (start of series production)
54.21 Control modules/modules
Model series 221 with code 806 (start of series production)
Reason for change
Reason for block
After installation of an upper control panel control unit (UCP) modification year 09/1 (A221 905 27 00 or A221 905 29 00) in vehicles with code 806
(start of series production), the following faults may occur:
^ PTS switch: Function LED permanently illuminated, function not impaired
^ Ambiance illumination in cockpit trim strip nonfunctional
^ In the quick test, fault 9049 (incorrect variant of cockpit switch group) and 9050 (incorrect variant of rotary light switch) are current and stored.
^ On vehicles from USA and Canada, the "Air recirculation comfort closing" function for the windows and sliding roof via the air recirculation button is
The UCP evaluates the modification year information of the CGW on the CAN incorrectly and thus treats the described functions differently than in the
year of production startup due to changes in the model refinement.
No remedy is available at the present time. Flashware is being prepared. We will inform you via TIPS as soon as this is available.