B14A2

HEATING / AIR CONDITIONING: 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) is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the automatic light control sensor (solar sensor) varies in accordance with the amount of sunlight. When the amount of sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The air conditioning amplifier assembly detects changes in the output voltage 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.

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner





OK:

The display is as specified in the Normal Condition column.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the I1 automatic light control sensor (solar 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 - AUTOMATIC LIGHT CONTROL SENSOR)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the H85 air conditioning amplifier assembly connector.

(b) 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. INSPECT AUTOMATIC LIGHT CONTROL SENSOR

(a) Remove the automatic light control sensor (solar sensor).





(b) Reconnect the I1 automatic light control sensor (solar sensor) connector.

(c) Turn the power switch on (IG).

(d) 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 1 and the positive (+) lead to terminal 3 of the automatic light control sensor (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 automatic light control sensor (solar sensor).
* As the inspection light is moved away from the sensor, the voltage decreases.

Text in Illustration





NG -- REPLACE AUTOMATIC LIGHT CONTROL SENSOR Removal

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)

(a) Disconnect the H16 main body ECU (multiplex network body ECU) connector.

(b) 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