B1421

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1421/21: Solar Sensor Circuit (Passenger Side)
B1421/21 - Solar Sensor Circuit (Passenger Side)

DESCRIPTION

The A/C solar sensor is installed on the upper part of the instrument panel. The A/C solar sensor detects the amount of solar radiation and controls the "AUTO" function of the air conditioner. The output voltage of the A/C solar sensor changes according to the amount decreases, the voltage increases. The air conditioning amplifier reads the output voltage from the A/C 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 on.

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

Data List / Air Conditioner:





OK:

The display is as specified in the normal condition.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. INSPECT MULTIPLEX NETWORK BODY ECU

(a) Remove the multiplex network body ECU with





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

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

Standard Voltage:





OK -- CHECK HARNESS AND CONNECTOR
NG -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR

(a) Disconnect the connector from the A/C solar sensor.

(b) Disconnect the connector from the multiplex network body ECU.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MULTIPLEX NETWORK BODY ECU

4. CHECK HARNESS AND CONNECTOR

(a) Disconnect the connector from A/C solar sensor.

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

(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.

5. INSPECT A/C SOLAR SENSOR

(a) Remove the A/C solar sensor.





(b) Apply battery voltage between terminals F1-3 (CLTE) and F1-6 (CLTB) of the A/C 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 positive (+) lead to terminal 2 and negative (-) lead to terminal 1 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
* As the inspection light is moved away from the sensor the voltage decreases.
* Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor.

NG -- REPLACE A/C SOLAR SENSOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER