DESCRIPTION
The 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 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 A/C amplifier detects changes in the output voltage from the solar sensor.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
B14A2 | Short in driver side solar sensor circuit |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first Click here.
PROCEDURE
READ VALUE USING INTELLIGENT TESTER
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Enter the following menus: Body / Air Conditioner / Data List.
Check the value(s) by referring to the table below.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
Solar Sensor (D side) | Driver side solar sensor / Min.: 0 Max.: 255 |
Driver side solar sensor value increases as brightness increases | - |
OK |
---|
The display is as specified in the Normal Condition column. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
C |
REPLACE A/C AMPLIFIER Click here |
A |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
Disconnect the solar sensor connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR) Click here |
OK |
CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)
Disconnect the solar sensor connector.
Disconnect the A/C amplifier connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
*1: for RHD
*2: for LHD
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT SOLAR SENSOR
Remove the solar sensor.
Reconnect the solar sensor connector.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
*1: for RHD
*2: for LHD
Note
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 2 and the positive (+) lead to terminal 6 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.
Tech Tips
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 Click here |
OK |
REPLACE A/C AMPLIFIER Click here
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR)
Disconnect the main body ECU connector.
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 Click here