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Home >> Mercedes Benz >> 1994 >> C220 >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (A/C-Heater Systems - Automatic) >> Testing >> Diagnostic Output

Diagnostic Output

WARNING: This page is about a different car, the 1999 Mercedes-Benz C230. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition off. Disconnect A/C push-button control unit connectors. Connect socket box to A/C push-button control unit. Connect DVOM negative lead to socket box terminal No. 12 and positive lead to terminal No. 17. Turn ignition on. If DVOM does not indicate 11-14 volts, check diagnostic output circuit. See WIRING DIAGRAMS . If circuit is okay, replace A/C push-button control unit. See A/C PUSH-BUTTON CONTROL UNIT  under REMOVAL & INSTALLATION.

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