Manual A/C Identification Table
MANUAL A/C IDENTIFICATION CHART Manual A/C Type Description Visual Identification Manual A/C (Type 1) Two Control Dial System [with variable blower control (VBC)] Manual A/C (Type 2) Three Control Dial System [without variable blower control (VBC)]
Scheme 1
Scheme 2
Description of Refrigerant System Protection
Refer to [ REFRIGERATION SYSTEM: REFRIGERANT SYSTEM PROTECTION ]
Scheme 3
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
DESCRIPTION
The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on front air control. Refer to applicable sections (items) for details. Malfunctions (if any are present) will be displayed in the form of turning ON the A/C, MAX A/C, DEF and Intake button LED's. Refer to [ SELF-DIAGNOSIS FUNCTION ].
Scheme 4
- Turn ignition switch ON.
- Press the FLOOR/DEF and DEF mode switches at the same time and release on the front air control.
- Press the FLOOR and intake buttons within two seconds to enter DTC check mode.
- The mode (VENT, FLOOR/DEF, FLOOR and VENT/FLOOR) LED's start flashing in a clockwise sequence indicating that Self test is in progress. This takes about 17 seconds to complete.
- All mode LED's stay ON once self test completes.
- Malfunctions (if any) will be displayed in the form of turning ON the A/C, MAX A/C, DEF and Intake button LED's. Refer to [ «SELF-DIAGNOSIS FUNCTION»(ref-375731-S01103107072010102800000) ].
- To exit diagnostic mode, press any button on the front air control.
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 5
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 6
Scheme 7
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 8
SYSTEM DESCRIPTION
The front air control controls compressor operation based on intake temperature and a signal from ECM.