DTC B1331: Right A/C Temperature Sensor: Description

Right A/C temperature sensor (located on right side of dash, in A/C duct) is a thermistor that controls signal voltage to Instrument Panel Integration Module (IPM). IPM applies voltage to circuit No. 517 (Tan wire), between right A/C temperature sensor and IPM.

When sensor is cold, resistance is high and IPM will sense a high voltage signal at IPM connector terminal B7 (Tan wire). When sensor warms up, resistance is reduced and signal voltage is pulled low through circuit No. 61 (Yellow wire), between IPC and sensor.

Signal voltage varies from 5 volts (open circuit) to zero volt (shorted circuit). DTC will set when ignition switch is in ON position or circuit is open or shorted. When DTC is set and air delivery is set to A/C or BI-LEVEL, air mix door No. 2 will cycle between hot and cold positions.