Driver Side Solar Sensor Short Circuit (B14A2)

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
B14A2	Short in driver 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
CAUTION / NOTICE / HINT

HINT:

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

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

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

Air Conditioner

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

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE A/C AMPLIFIER

A

1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the solar sensor connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F4-6 (CLTB) - F4-3 (CLTE)	Ignition switch off	Below 1 V
F4-6 (CLTB) - F4-3 (CLTE)	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Solar Sensor)

NG

GO TO STEP 5

OK

1. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)

(a) Disconnect the solar sensor connector.

(b) Disconnect the A/C amplifier connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D47-33 (TSD) - F4-1 (TSL)	Always	Below 1 Ω
D47-33 (TSD) - Body ground	Always	10 kΩ or higher

Text in Illustration

*1	Front view of wire harness connector (to Solar Sensor)
*2	Front view of wire harness connector (to A/C Amplifier)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. INSPECT SOLAR SENSOR

(a) Remove the solar sensor.

(b) Reconnect the solar sensor connector.

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F4-1 (TSL) - F4-3 (CLTE)	Sensor is subjected to electric light	0.8 to 4.3 V
F4-1 (TSL) - F4-3 (CLTE)	Sensor is covered with a cloth	Below 0.8 V

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 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.

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.

Text in Illustration

*1	Component with harness connected (Solar Sensor)

OK

REPLACE A/C AMPLIFIER

NG

REPLACE SOLAR SENSOR

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

(a) Disconnect the main body ECU connector.

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition D49-20 (CLTB) - F4-6 (CLTB) Always Blow 1 Ω D49-18 (CLTE) - F4-3 (CLTE) Always Blow 1 Ω D49-20 (CLTB) - Body ground Always 10 kΩ or higher D49-18 (CLTE) - Body ground Always 10 kΩ or higher Text in Illustration *1 Front view of wire harness connector (to Main Body ECU) *2 Front view of wire harness connector (to Solar Sensor)

OK

REPLACE MAIN BODY ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR