Test 2: Antenna (Hf Line Short To Ground)
WARNING: This page does not describe the selected car, but rather 29 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.
Disconnect connector at sun roof control panel control module, located at front center of roof. Measure resistance between ground and terminal No. 7 at sun roof control module connector. Resistance should be more than 20 k/ohms. If resistance is as specified, antenna is okay at this time. If resistance is not as specified, repair or replace antenna.