Computers/Controls ­ Malfunctions Of Various Power/Control Unit

2010 Mercedes Benz S 600 (221.176) V12­5.5L Turbo (275.953)      
Vehicle: All Technical Service Bulletins
Computers/Controls ­ Malfunctions Of Various Power/Control Unit
Malfunctions of various control units and/or on­board power supply problems caused by water in the control unit tray under the driver/front passenger seat (dislocated, pinched or leaking condensation hose)
Topic number L183.00­P­052510
Version 2
Design group 83.00 General
Date 02­28­2013
Validity All Mercedes­Benz cars
Reason for change Remedy adapted, validity adapted
Complaint:
Water that enters into the control unit tray under the driver/front passenger seat can damage the control units installed there and
complaints may be received about the functions associated with these control units.
Problems with the on­board power supply voltage may also occur.
Cause:
The condensation hose (right/left) on the A/C housing may either be dislocated, pinched/crushed (water collects in A/C housing)
or leaking, resulting in water entering the interior.
Remedy:
If the condensation hose (right/left) is dislocated, push it all the way back onto the outlet fitting of the A/C housing and check for
tight seating by pulling gently. If necessary, use a cable tie to additionally fix the condensation hose in place. Never use soapy
water or silicone spray to install.
If the condensation hose (right/left) is pinched/crushed, it can be checked for free passage as follows:
1. Use the operating unit to set maximum cooling on both sides.
2. On the vehicle underside, check whether water emerges from the condensation water drains. If no water emerges, the hose is
blocked. In this case, reposition the hose correctly to ensure free passage or replace the hose if it is damaged.
Invoice the damage with reference to the appropriate damage code..
Symptoms
Work units