AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

DTC Code	DTC Name
B14A3	Front Passenger Side Solar Sensor Short Circuit

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 amount of 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
B14A3	Short in passenger side solar sensor circuit	Solar sensor Harness or connector between solar sensor and A/C amplifier Harness or connector between solar sensor and main body ECU Main body ECU A/C amplifier

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 power 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.

Air Conditioner
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Solar Sensor (P Side)	Passenger side solar sensor / Min.: 0 Max.: 255	Passenger side solar sensor value increases as brightness increases	-

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

Result

Result	Proceed to
NG	A
OK (When troubleshooting according to Problem Symptoms Table)	B
OK (When troubleshooting according to the DTC)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

REPLACE A/C AMPLIFIER Click here

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

*1
Front view of wire harness connector

(to Solar Sensor)

Disconnect the solar sensor connector.

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

Standard Voltage

Tester Connection	Condition	Specified Condition
H3-6 (CLTB) - H3-3 (CLTE)	Power switch off	Below 1 V
H3-6 (CLTB) - H3-3 (CLTE)	Power switch on (IG)	11 to 14 V

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR) Click here

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

Tester Connection	Condition	Specified Condition
F50-32 (TSP) - H3-2 (TSR)*1	Always	Below 1 Ω
F50-32 (TSP) - H3-1 (TSL)*2	Always	Below 1 Ω
F50-32 (TSP) - Body ground	Always	10 kΩ or higher

*1: for LHD
*2: for RHD

Text in Illustration
*1	Front view of wire harness connector (to Solar Sensor)
*2	Front view of wire harness connector (to A/C Amplifier)
*3	for LHD
*4	for RHD

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT SOLAR SENSOR

Text in Illustration
*1	Component with harness connected (Solar Sensor)
*2	for LHD
*3	for RHD

Remove the solar sensor.

Reconnect the solar sensor connector.
Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
H3-2 (TSR) - H3-3 (CLTE)*1	Sensor is exposed to electric light	0.8 to 4.3 V
H3-2 (TSR) - H3-3 (CLTE)*1	Sensor is covered with a cloth	Below 0.8 V
H3-1 (TSL) - H3-3 (CLTE)*2	Sensor is exposed to electric light	0.8 to 4.3 V
H3-1 (TSL) - H3-3 (CLTE)*2	Sensor is covered with a cloth	Below 0.8 V

*1: for LHD
*2: for RHD

Note

The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect a negative (-) lead to terminal 1*1 or 2*2 and a 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.