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Table 1. Communication Table Transmitter Receiver Signal Communication Line Air conditioning amplifier assembly ECM A/C idle up request signal CAN Heater idle up request signal Motor cooling fan driver request signal PTC heater control request signal (w/ PTC Heater) Electricity load at low voltage state signal Variable compressor solenoid current signal Refrigerant gas pressure sensor signal Ambient temperature signal Main body ECU Air conditioning amplifier assembly Steering wheel location information signal Combination meter assembly Air conditioning amplifier assembly Vehicle speed signal Outside temperature sensor data signal ECM Air conditioning amplifier assembly Engine coolant temperature signal Engine speed data A/C control cut-off signal Variable control inhibition signal Engine type information signal