Solar Sensor Circuit (Passenger Side) - Air Conditioning System (for Automatic Air Conditioning System)

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1421/21: Solar Sensor Circuit (Passenger Side)

DTC B1421/21 - Solar Sensor Circuit (Passenger Side)

DESCRIPTION





The 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 voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The A/C amplifier detects voltage output from the solar sensor.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: If the check is performed in a dark place, DTC B1421/21 (solar sensor circuit abnormal) may be output even though the system is normal.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Expose the sensing portion of the solar sensor to light.
HINT: Use an incandescent light for inspection.
(d) Select the item below in the Data List, and read the display on the Techstream.

Data List / Air Conditioner





OK:
The display is as specified in the "Normal Condition" column.
Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR)




(a) Disconnect the connector from the solar sensor.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






NG -- CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)
OK -- REPLACE SOLAR SENSOR
3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)




(a) Disconnect the connector from the A/C amplifier.




(b) 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