The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air inlet damper to any position, which controls the intake air settings (fresh, fresh/recirculation and recirculation).

The air conditioning amplifier assembly communicates with the ECM and meter ECU through the CAN communication system.

Disconnect the A13 air conditioner pressure sensor connector.

The air conditioning harness assembly connects the air conditioning amplifier assembly and servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.

The air conditioning amplifier assembly sends an air conditioning operation request signal to the ECM via direct line, and the ECM sends a magnet clutch operation permission signal to the air conditioning amplifier assembly via direct line.

The No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air mix damper to any position. As a result, the air mix damper varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air is as requested.

The air conditioning amplifier assembly applies voltage (5 V) to the No. 1 cooler thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.

The No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air outlet damper to any position, which controls the air outlet changes.

The air conditioning amplifier assembly applies a voltage (5 V) to the cooler thermistor (ambient temperature sensor) and reads voltage changes as changes in the resistance of the cooler thermistor (ambient temperature sensor).

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 HEATING / AIR CONDITIONING