Manual A/C Identification Table
Refer to MANUAL A/C IDENTIFICATION TABLE.
Description of Refrigerant System Protection
Refer to REFRIGERATION SYSTEM: REFRIGERANT SYSTEM PROTECTION
Scheme 100
Heater & Air Conditioning Control System: Operational Check
The purpose of the operational check is to confirm that the system operates properly.
Conditions: Engine running and at normal operating temperature
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.
Scheme 101
The front air control receives data from the temperature selected by the driver. The front air control then applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing the air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied to it. The front air control monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
Scheme 102
Scheme 103
The intake door control determines the intake door position based on the position of the recirculation switch. When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the opposite direction, again allowing fresh air into the cabin.
Scheme 104
SYSTEM DESCRIPTION
The front air control controls compressor operation based on intake temperature and a signal from ECM.