Diagnostic Output
WARNING: This page is about a different car, the 1998 Mercedes-Benz C43, 1998 Mercedes-Benz C280, and 1998 Mercedes-Benz C230. However, it is still accessible from the selected car via links, so may be relevant.
Connect socket box and 5-connector test cable to A/C push-button control unit left connector. See Figure. Turn ignition on. Connect DVOM negative lead to ground and positive lead to terminal No. 15. About 11-14 volts should be present. If voltage is not to specification, check wiring. See WIRING DIAGRAMS .