AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A2

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A00447AE16

The solar sensor (automatic light control sensor) is installed on the upper side of the instrument panel. It detects sunlight and creates a signal that is used for air conditioning control in AUTO mode. The output voltage from the solar sensor (automatic light control 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 assembly detects changes in the output voltage from the solar sensor (automatic light control sensor).

DTC No. DTC Detection Condition Trouble Area
B14A2 Short in driver side solar sensor circuit

  • Solar sensor (automatic light control sensor)

  • Harness or connector between solar sensor (automatic light control sensor) and air conditioning amplifier assembly

  • Harness or connector between solar sensor (automatic light control sensor) and main body ECU (multiplex network body ECU)

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A0043MRE55

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. 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)

      Solar sensor (automatic light control sensor) /

      Min.: 0

      Max.: 255

      		 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 Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A0041Q5E81
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Solar Sensor (Automatic Light Control Sensor))

      Disconnect the I1 solar sensor (automatic light control sensor) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I1-3 (CLTB) - I1-6 (CLTE) Power switch off Below 1 V
      I1-3 (CLTB) - I1-6 (CLTE) Power switch on (IG) 11 to 14 V

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the L14 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L14-33 (TS) - I1-1 (NSHA) Always Below 1 Ω
      L14-33 (TS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)


    1. A0040MNE81
      Text in Illustration
      *a

      Component with harness connected

      (Solar Sensor (Automatic Light Control Sensor))

      Remove the solar sensor (automatic light control sensor) Click here.

    2. Reconnect the I1 solar sensor (automatic light control sensor) connector.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I1-1 (NSHA) - I1-6 (CLTE) Sensor is exposed to electric light 0.8 to 4.3 V
      I1-1 (NSHA) - I1-6 (CLTE) Sensor is covered with a cloth Below 0.8 V

      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 1 and the positive (+) lead to terminal 6 of the solar sensor (automatic light control sensor).

      • While using the auxiliary 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 (automatic light control sensor).

      • As the inspection light is moved away from the sensor, the voltage decreases.


    NG

    REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

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


    1. Disconnect the L7 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L7-20 (CLTB) - I1-3 (CLTB) Always Below 1 Ω
      L7-22 (CLTE) - I1-6 (CLTE) Always Below 1 Ω
      L7-20 (CLTB) - Body ground Always 10 kΩ or higher
      L7-22 (CLTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here