AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A8, B14A9, B14AA
| DTC Code | DTC Name |
|---|---|
| B14A8 | Glass Temperature Sensor Circuit |
| B14A9 | Glass Surroundings Temperature Sensor Circuit |
| B14AA | Glass Humidity Sensor Circuit |
DESCRIPTION
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B14A8:The air conditioning amplifier assembly detects the windshield glass surface temperature from this circuit. The air conditioning amplifier assembly applies voltage to the air conditioning thermistor assembly (glass temperature sensor). As the windshield glass surface temperature rises, the resistance decreases. The air conditioning amplifier assembly detects the change in resistance as the windshield glass surface temperature changes.
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B14A9: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 change in resistance as the windshield glass surroundings temperature changes.
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B14AA:The air conditioning thermistor assembly (glass humidity sensor) detects cabin humidity. The voltage of the air conditioning thermistor assembly (glass humidity sensor) changes in accordance with cabin humidity. The air conditioning amplifier assembly reads the changes in output voltage of the air conditioning thermistor assembly (glass humidity sensor).
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The glass temperature sensor is integrated with the air conditioning thermistor assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| B14A8 | Glass Temperature Sensor Circuit | Open or short in glass temperature sensor circuit | Air conditioning thermistor assembly (glass temperature sensor) | Memorized (4 sec. or more) |
| B14A9 | Glass Surroundings Temperature Sensor Circuit | Open or short in glass surroundings temperature sensor circuit | Air conditioning thermistor assembly (glass surroundings temperature sensor) | Memorized (4 sec. or more) |
| B14AA | Glass Humidity Sensor Circuit | Open or short in glass humidity sensor circuit | Air conditioning thermistor assembly (glass humidity sensor) | Memorized (4 sec. or more) |
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*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following procedure.
Tech Tips
The air conditioning thermistor assembly must be replaced if the glass temperature sensor is malfunctioning.
PROCEDURE
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CHECK FOR DTC
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Check for DTCs.
Body Electrical > Air Conditioner > Trouble CodesResult Result Proceed to DTC B1279 is output A DTC B1373 is output B DTC B14A8 is output C DTC B14A9 is output DTC B14AA is output
A 
GO TO DTC B1279 Click here
B
GO TO DTC B1373 Click here
C
REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY Click here
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