Test 13: Anti-Tow Switch
WARNING: This page is about a different car, the 2000 Mercedes-Benz SLK230 and 1999 Mercedes-Benz SLK230. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect Pneumatic System Equipment (PSE) control module connectors. Measure resistance between PSE connector No. 3 terminal No. 6 and connector No. 2 terminal No. 3. Press top of anti-tow switch. Less than one ohm should exist. If resistance is as specified, anti-tow switch and wiring are okay at this time. If resistance is not as specified, check wiring. See WIRING DIAGRAMS . If wiring is okay, replace anti-tow switch.