B14A9

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B14A9: Glass Surroundings Temperature Sensor Circuit
B14A9 - Glass Surroundings Temperature Sensor Circuit

DESCRIPTION

The air conditioning amplifier assembly detects the temperature of the area near the windshield glass using this circuit. The air conditioning amplifier assembly applies voltage to the air conditioning thermistor assembly (glass surroundings temperature sensor). As the temperature of the area near the windshield glass rises, the resistance decreases. The air conditioning amplifier assembly detects the resistance change as the windshield glass surroundings temperature changes.





HINT
The whole air conditioning thermistor assembly should be replaced if the glass surroundings temperature sensor is malfunctioning.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner





OK:

The display is as specified in the Normal Condition column.

NG -- INSPECT AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS SURROUNDINGS TEMPERATURE SENSOR)

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

2. INSPECT AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS SURROUNDINGS TEMPERATURE SENSOR)

(a) Remove the air conditioning thermistor assembly (glass surroundings temperature sensor).





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NOTICE:
* Hold the sensor only by its connector. Touching the sensor may change the resistance value.
* When measuring, the sensor temperature must be the same as the ambient temperature.

Text in Illustration





NG -- REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY Removal
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - GLASS SURROUNDINGS TEMPERATURE SENSOR)

(a) Disconnect the T11 air conditioning thermistor assembly (glass surroundings temperature sensor) connector.

(b) Disconnect the H86 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal