Test 2: Power Window Synchronization
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 Mercedes-Benz E430, 1999 Mercedes-Benz E320, 1999 Mercedes-Benz E300, 1999 Mercedes-Benz CLK430, and 1999 Mercedes-Benz CLK320. However, it is still accessible from the selected car via links, so may be relevant.
Connect Hand-Held Tester (HHT) to Data Link Connector (DLC) and verify synchronization of all door control modules. HHT will indicate YES or NO. If NO is displayed, synchronize power window motors.