AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

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

DESCRIPTION

A01H1ZOE01

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

A01H1QLE13

INSPECTION PROCEDURE

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.

    NG

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01GZJYE23

      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) Power switch ON (IG) 11 to 14 V
      M2-6 (CLTB) - M2-3 (CLTE) Power 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. A01H1LHE11

      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
      L77-8 (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

    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)

    A01GZIEE02

    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)