AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

DTC Code DTC Name
B14A3 Front Passenger Side Solar Sensor Short Circuit

DESCRIPTION

A001F03E45

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
B14A3 Short in passenger side automatic light control sensor circuit
  • Automatic light control sensor (solar sensor)

  • Harness or connector

  • Main body ECU

  • Air conditioning amplifier

WIRING DIAGRAM

A001FIME22

PROCEDURE


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


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

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

      Front passenger side automatic light control sensor /

      Min.: 0, Max.: 255

      Front passenger 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
    C
    A
  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A001FI9E03
      *1 Front view of wire harness connector: (to Automatic Light Control Sensor)

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


    1. Disconnect the M2 automatic light control sensor connector.

      A001EKSE02
    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
      L77-8 (TSP) - M2-2 (TSR) Always Below 1 Ω
      L77-8 (TSP) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      L77-8 (TSP) - M2-1 (TSL) Always Below 1 Ω
      L77-8 (TSP) - Body ground Always 10 kΩ or higher

    NG
    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.


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

    A001C2SE01
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Front view of wire harness connector: (to Automatic Light Control Sensor)

    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

    OK
    NG