DTC    B14A2    Driver Side Solar Sensor Short Circuit

for Preparation Click here


DESCRIPTION

E107008E01
The solar sensor (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 solar sensor (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 solar sensor (automatic light control sensor).

DTC No.
DTC Detection Condition
Trouble Area
B14A2
Short in driver side solar sensor circuit
  1. Solar sensor (automatic light control sensor)
  2. Harness and connector between solar sensor (automatic light control sensor) and air conditioning amplifier
  3. Harness and connector between solar sensor (automatic light control sensor) and main body ECU
  4. Main body ECU
  5. Air conditioning amplifier

WIRING DIAGRAM


E147579E05


INSPECTION PROCEDURE

HINT:
If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first (Click here).

1.READ VALUE USING INTELLIGENT TESTER (SOLAR SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

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

  1. According to the display on the intelligent tester, read the Data List.

    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
    		Open in circuit: 0
    Short in circuit: 255

    OK:
    The display is as specified in the normal condition column.


    Result 
    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to the Problem Symptoms Table)
    		B
    OK (When troubleshooting according to the DTC output)
    		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)


    E107010E16

  1. Disconnect the T1 solar sensor (automatic light control sensor) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T1-3 (CLTB) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    T1-6 (CLTE) - T1-3 (CLTB)
    		Ignition switch off
    		Below 1 V
    T1-6 (CLTE) - T1-3 (CLTB)
    		Ignition switch ON
    		11 to 14 V

  1. Reconnect the solar sensor (automatic light control sensor) connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Solar Sensor (Automatic Light Control Sensor))



NG
Go to step 5
OK


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


    E176174E01

  1. Disconnect the T1 solar sensor (automatic light control sensor) connector.

  1. Disconnect the G33 air conditioning amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D15-33 (TS) - T1-1 (TSD)
    		Always
    		Below 1 Ω
    D15-33 (TS) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the solar sensor (automatic light control sensor) connector.

  1. Reconnect the air conditioning amplifier connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Solar Sensor (Automatic Light Control Sensor))
    *2
    		Front view of wire harness connector
    (to Air Conditioning Amplifier)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)


    E161710E21

  1. Remove the solar sensor (automatic light control sensor) with its connector still connected (Click here).

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    T1-1 (TSD) - T1-6 (CLTE)
    		Sensor is subjected to electric light
    		0.8 to 4.3 V
    T1-1 (TSD) - T1-6 (CLTE)
    		Sensor is covered with a cloth
    		Below 0.8 V

    NOTICE:
    1. 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.
    2. 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:
    1. Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor.
    2. As the inspection light is moved away from the sensor, the voltage decreases.

  1. Reinstall the solar sensor (automatic light control sensor).
    Text in Illustration 
    *1
    		Component with harness connected
    (Solar Sensor (Automatic Light Control Sensor))



NG
REPLACE AUTOMATIC LIGHT CONTROL SENSOR (Click here)
OK

REPLACE AIR CONDITIONING AMPLIFIER (Click here)  

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


    E174461E01

  1. Disconnect the D42 main body ECU connector.

  1. Disconnect the T1 solar sensor (automatic light control sensor) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D42-20 (CLTB) - T1-3 (CLTB)
    		Always
    		Below 1 Ω
    D42-22 (CLTE) - T1-6 (CLTE)
    		Always
    		Below 1 Ω
    D42-20 (CLTB) - Body ground
    		Always
    		10 kΩ or higher
    D42-22 (CLTE) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the main body ECU connector.

  1. Reconnect the solar sensor (automatic light control sensor) connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Main Body ECU)
    *2
    		Front view of wire harness connector
    (to Solar Sensor (Automatic Light Control Sensor))



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (Click here)