B14A2

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B14A2: Driver Side Solar Sensor Short Circuit
B14A2 - Driver Side Solar Sensor Short Circuit

DESCRIPTION





The automatic light control sensor (solar sensor), which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in auto mode. The output current from the automatic light control sensor (solar sensor) varies according to the amount of sunlight. When the amount of sunlight increases, the output current increases. As the amount of sunlight decreases, the output current decreases. The air conditioning amplifier assembly detects the output current from the automatic light control sensor (solar sensor).





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first B1244.
* If the check is performed in a dark place, DTC B14A2 or B14A3 (solar sensor circuit abnormal) may be stored even though the system is normal.

PROCEDURE

1. READ VALUE USING TECHSTREAM (SOLAR SENSOR)

(a) Use the Data List to check if the automatic light control sensor (solar sensor) is functioning properly Air Conditioning System (for Automatic Air Conditioning System).

Air Conditioner





OK:

The display is as specified in the normal condition column.

Result





B -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

C -- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

A -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Automatic Air Conditioning System)

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the G2 sensor connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the G2 sensor connector.

(b) Disconnect the F42 amplifier connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)

(a) Remove the automatic light control sensor (solar sensor) with its connector still connected Removal.





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

Standard Voltage:





Text in Illustration





NOTICE:
The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the negative (-) lead to terminal 1 and the positive (+) lead to terminal 3 of the solar sensor.

HINT
* Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor.
* As the inspection light is moved away from the sensor, the voltage decreases.

NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR) Removal

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR)

(a) Disconnect the F9 ECU connector.

(b) Disconnect the G2 sensor 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 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal