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

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1424/24: Solar Sensor Circuit (Driver Side)
B1424/24 - Solar Sensor Circuit (Driver Side)

DESCRIPTION





The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning AUTO mode. The output voltage from the solar sensor varies in accordance with the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The air conditioning amplifier detects changes in the output voltage from the solar sensor.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch on (IG) and turn Techstream main switch on.

(c) Select the item below in the Data List, and read the value displayed on Techstream.

Data List / Air Conditioner





OK:

The display is as specified in the normal condition column.

Result:





B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Automatic Air Conditioning System)

C -- REPLACE AIR CONDITIONING AMPLIFIER Removal
A -- Continue to next step.

2. CHECK SOLAR SENSOR (SENSOR POWER INPUT)

(a) Disconnect the F2 solar sensor connector.





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

Standard voltage:





OK -- CHECK SOLAR SENSOR
NG -- Continue to next step.

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

(a) Disconnect the D7 in body ECU connector.





(b) Disconnect the F2 solar 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 (INSTRUMENT PANEL JUNCTION BLOCK)

4. CHECK SOLAR SENSOR

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





(b) Connect the battery's positive (+) lead to terminal 6 (CLTB) and the negative (-) lead to terminal 3 (CLTE) of the solar sensor.

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

Standard voltage:





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 6 and positive (+) lead to terminal 3 of the solar sensor.
* While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

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 SOLAR SENSOR Removal
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)

(a) Disconnect the F2 solar sensor connector.





(b) Disconnect the D37 air conditioning 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 -- REPLACE AIR CONDITIONING AMPLIFIER Removal