Toyota 4Runner: Front Passenger Side Solar Sensor Short Circuit (B14A3)

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Front Passenger Side Solar Sensor Short Circuit (B14A3)

DESCRIPTION

The automatic light control sensor (solar sensor), which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in auto mode. The output current from the solar sensor varies according to the amount of sunlight. When the amount of sunlight increases, the output current increases. As the amount of sunlight decreases, the output current decreases. The air conditioning amplifier assembly detects the output current from the solar sensor.

DTC Code	DTC Detection Condition	Trouble Area
B14A3	An open or short in the passenger side solar sensor circuit.	Automatic light control sensor (solar sensor) Harness or connector Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first (See page ).

If the check is performed in a dark place, DTC B14A2 or B14A3 (solar sensor circuit abnormal) may be stored even though the system is normal.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (SOLAR SENSOR)

(a) Use the Data List to check if the automatic light control sensor (solar sensor) is functioning properly (See page ).

Air Conditioner

Tester Display	Measurement Item/Rang	Normal Condition	Diagnostic Note
Solar Sensor (P side)	Automatic light control sensor (solar sensor) / Min.: 0, Max.: 255	Passenger side solar sensor voltage increases as brightness increases	Open in the circuit: 0. Short in the circuit: 255.

Tester Display

Measurement Item/Rang

Normal Condition

Diagnostic Note

Solar Sensor (P side)

Automatic light control sensor (solar sensor) / Min.: 0, Max.: 255

Passenger side solar sensor voltage increases as brightness increases

Open in the circuit: 0.

Short in the circuit: 255.

OK:

The display is as specified in the normal condition column.

Result

Result	Proceed to
OK (When troubleshooting according to problem symptoms table)	A
OK (When troubleshooting according to the DTC)	B
NG	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER ASSESMBLY

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the G2 sensor connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G2-6 (CLTB) - G2-3 (CLTE)	Ignition switch off	Below 1 V
G2-6 (CLTB) - G2-3 (CLTE)	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Automatic Light Control Sensor [Solar Sensor])

GO TO STEP 5

3.	CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the G2 sensor connector.

(b) Disconnect the F42 amplifier connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-2 (TSR) - F42-32 (TSP)	Always	Below 1 Ω
G2-2 (TSR) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)

(a) Remove the automatic light control sensor (solar sensor) with its connector still connected (See page ).

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G2-2 (TSR) - G2-3 (CLTE)	Ignition switch ON Sensor subjected to electric light	0.8 to 4.3 V
G2-2 (TSR) - G2-3 (CLTE)	Ignition switch ON Sensor covered with cloth	Below 0.8 V

Tester Connection

Switch Condition

Specified Condition

G2-2 (TSR) - G2-3 (CLTE)

Ignition switch ON

Sensor subjected to electric light

0.8 to 4.3 V

G2-2 (TSR) - G2-3 (CLTE)

Ignition switch ON

Sensor covered with cloth

Below 0.8 V

Text in Illustration

*a	Component with harness connected (Automatic Light Control Sensor [Solar Sensor])

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 2 and the positive (+) lead to terminal 3 of the solar sensor.

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.

REPLACE AIR CONDITIONING AMPLIFIER ASSESMBLY

REPLACE AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)

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

(a) Disconnect the F9 ECU connector.

(b) Disconnect the G2 sensor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F9-22 (CLTE) - G2-3 (CLTE)	Always	Below 1 Ω
F9-20 (CLTB) - G2-6 (CLTB)	Always	Below 1 Ω
F9-22 (CLTE) - Body ground	Always	10 kΩ or higher
F9-20 (CLTB) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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