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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 >> Front Control Module Does Not Control Rear Auxiliary Doors

Front Control Module Does Not Control Rear Auxiliary Doors

  1. Ignition ON, disconnect front auxiliary HVAC control module connector. Connect un-powered test light between front auxiliary HVAC control module 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 341) between splice S308 and front auxiliary HVAC control module.
  2. Connect powered test light between front auxiliary HVAC control module connector terminal B and ground. If test light is lit, replace front auxiliary HVAC control module. If test light is not lit, repair open in Black wire (circuit 150) between front auxiliary HVAC control module and splice S307.
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