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Home >> GMC >> 1996 >> Suburban C2500, 7.4 J >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater System >> Trouble Shooting >> Rear Ventilation Controls Do Not Operate From Either Control Module

Rear Ventilation Controls Do Not Operate From Either Control Module

  1. Ignition ON, disconnect connector at rear auxiliary mode door motor. Connect un-powered test light between connector terminal 10 (Brown wire) and ground. If test light is lit, go to next step. If test light is not lit, repair open in Brown wire (circuit 141) between I/P fuse block and splice S400.
  2. Connect a powered test light between rear auxiliary mode door motor connector terminal 7 (Black wire) and ground. If test light is lit, go to next step. If test light is not lit, repair open in Black wire (circuit 150) between splice S403 and ground G400.
  3. Disconnect front auxiliary HVAC connector. Connect an un-powered test light between front auxiliary HVAC connector terminal G and ground. If test light is lit, go to next step. If test light is not lit, repair open in Brown wire (circuit 141) between splice S310 and splice S308.
  4. Connect powered test light between front auxiliary heater and A/C control module connector terminal B (Black wire) and ground. If test light is lit, replace auxiliary HVAC control logic module. If test light is not lit, repair open in Black wire (circuit 150) between splice S307 and splice S410.
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