Computers/Controls - Malfunctions Of Various Power/Control Uni

Malfunctions of various control units and/or on-board power supply problems caused by water in the control unit tray under the driver/front passenger seat (dislocated, pinched or leaking condensation water hose)

Topic number LI83.00-P-052510

Version

Design group 83.00 General

Date 04-24-2012

Validity All Mercedes-Benz cars

Reason for change

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 on-board power supply voltage may also occur.

Affected control units may include, for example, central gateway (CGW), front signal acquisition and actuation module (SAM front), sound amplifier, adaptive damping system (ADS) and headlamp range adjustment (HRA).

Cause:
The condensation water 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. Take note if the hose was dislocated by the customer kicking the hose and inform appropriately.

Remedy:
If the condensation water 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. Never use soapy water or silicone spray to install.

If the condensation water 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.








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