AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A2

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A01GHM4E01

The automatic light control 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 automatic light control sensor varies in accordance with the amount of sunlight. When the 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 automatic light control sensor.

DTC Code DTC Detection Condition Trouble Area
B14A2 Short in driver side automatic light control sensor circuit

  • Automatic light control sensor (solar sensor)

  • Harness or connector

  • Main body ECU

  • Air conditioning amplifier

WIRING DIAGRAM

A01GN92E11

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS (SOLAR SENSOR [D SIDE])


    1. Use the Data List to check if the driver side solar sensor is functioning properly.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solar Sensor (D Side)

      Driver side automatic light control sensor /

      Min.: 0, Max.: 255

      		 Driver side automatic light control sensor value increases as brightness increases -
      OK
      The display is as specified in the normal condition.
      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 Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01GK2KE23

      Disconnect the M2 automatic light control sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      M2-3 (CLTE) - Body ground Always Below 1 Ω

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      M2-6 (CLTB) - M2-3 (CLTE) Engine switch on (IG) 11 to 14 V
      M2-6 (CLTB) - M2-3 (CLTE) Engine switch off Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR) Click here

    OK

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


    1. A01GL7QE10

      Disconnect the M2 automatic light control sensor connector.

    2. Disconnect the L77 air conditioning amplifier connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      L77-7 (TSD) - M2-1 (TSL) Always Below 1 Ω
      L77-7 (TSD) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      L77-7 (TSD) - M2-2 (TSR) Always Below 1 Ω
      L77-7 (TSD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)


    1. Remove the automatic light control sensor Click here.

    2. Inspect the automatic light control sensor Click here.


    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)

    A01GKH2E01

    1. Disconnect the L12 and DA main body ECU connectors.

    2. Disconnect the M2 automatic light control sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L12-20 (CLTB) - M2-6 (CLTB) Always Below 1 Ω
      L12-18 (CLTE) - M2-3 (CLTE) Always Below 1 Ω
      L12-20 (CLTB) - Body ground Always 10 kΩ or higher
      L12-18 (CLTE) - Body ground Always 10 kΩ or higher
      DA-40 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)