Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM10000000102CN
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B14A2; Driver Side Solar Sensor Short Circuit; 2017 - 2020 MY Sienna [08/2016 -        ]

DTC

B14A2

Driver 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 air conditioning amplifier detects changes in the output voltage from the solar sensor.

DTC Code

DTC Detection Condition

Trouble Area

B14A2

Short in driver side solar sensor circuit
  • Solar sensor
  • Harness or connector between solar sensor and air conditioning amplifier
  • Harness or connector between solar sensor and main body ECU
  • Main body ECU
  • Air conditioning amplifier

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: B1244; Light Sensor Circuit Malfunction ).

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 Electrical / 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

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 AIR CONDITIONING AMPLIFIER ASSEMBLY

A

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the solar sensor connector.

*a

Front view of wire harness connector

(to Solar Sensor)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D144-6 (CLTB) - D144-3 (CLTE)

Ignition switch off

Below 1 V

D144-6 (CLTB) - D144-3 (CLTE)

Ignition switch ON

11 to 14 V
NG

GO TO STEP 5

OK

3.

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

(a) Disconnect the D144 solar sensor connector.

(b) Disconnect the D75 air conditioning amplifier connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D75-33 (TSD) - D144-1 (TSL)

Always

Below 1 Ω

D75-33 (TSD) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT SOLAR SENSOR

(a) Remove the solar sensor.

*a

Component with harness connected

(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

D144-1 (TSL) - D144-3 (CLTE)

Sensor is subjected to electric light

0.8 to 4.3 V

D144-1 (TSL) - D144-3 (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.
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE SOLAR SENSOR

5.

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

(a) Disconnect the D13 main body ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D13-20 (CLTB) - D144-6 (CLTB)

Always

Below 1 Ω

D13-22 (CLTE) - D144-3 (CLTE)

Always

Below 1 Ω

D13-20 (CLTB) - Body ground

Always

10 kΩ or higher

D13-22 (CLTE) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR