B1412

DTC B1412/12 Ambient Temperature Sensor Circuit

DESCRIPTION

DTC Detecting Condition:

The A/C ambient temperature sensor is installed in the front part of the condenser to detect the ambient temperature and control the heater and air conditioner "AUTO" function. The sensor connected to the ECM detects fluctuation in the ambient temperature that is used for controlling the cabin temperature. The sensor sends a signal to the A/C amplifier assembly via the ECM. The resistance of the A/C ambient

temperature sensor changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The ECM applies voltage (5 V) to the A/C ambient temperature sensor and reads voltage changes as the resistance of the A/C ambient temperature sensor changes. The ECM sends the read signal to the A/C amplifier assembly via body multiplex communications.

Wiring Diagram:

Step 1-2:

Step 2(Continued)-3:

Step 3(Continued):

Step 4:

INSPECTION PROCEDURE