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Home >> Mercedes Benz >> 1999 >> C43 >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Manual A/C-Heater Systems - Ml 320, Ml 430 & Ml 55) >> System Tests >> Electrical Tests >> Ground Circuit Z50/4

Ground Circuit Z50/4

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  1. Connect socket box to A/C push button control unit wiring harness connector. See CONNECTING TEST EQUIPMENT  . Turn ignition off. Ensure A/C push button control unit is not connected to socket box.
  2. Connect ohmmeter positive lead to socket box terminal No. 9 and negative lead to body ground. Resistance should be zero. If resistance is not as specified, check control unit ground circuit Z50/4. See WIRING DIAGRAMS  . Repair as necessary.
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