DTC    B1424/24    Solar Sensor Circuit (Driver Side)

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DESCRIPTION

E107008E02
The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output voltage from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage also decreases. The A/C amplifier detects output voltage from the solar sensor.

DTC No.
DTC Detection Condition
Trouble Area
B1424/24
Open or short in driver side solar sensor circuit
  1. Solar sensor
  2. Harness and connector between solar sensor and A/C amplifier
  3. A/C amplifier

HINT:
If DTC B1244 is output at the same time, troubleshoot DTC B1244 first.


WIRING DIAGRAM


E109490E01


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and push the intelligent tester main switch on.

  1. Select the item below in the Data List, and read the display on the intelligent tester.


A/C amplifier: 
Item
Measure Item / Display
(Range)
Normal Condition
Diagnostic Note
Solar Sensor (D side)
(Solar Sens - D)
Driver side solar sensor /
Min.: 0, Max.: 255
Driver side solar sensor voltage increases as brightness increases
-

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


NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.INSPECT MULTIPLEX NETWORK BODY ECU
E103348E04

  1. Remove the cowl side junction block RH with its connectors still connected.

  1. Measure the resistance of the connector.

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

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    6 (CLTB) - 4 (CLTE)
    		Engine switch on (IG)
    		10 to 14 V
    Engine switch off
    		Below 1 V



NG
REPLACE MULTIPLEX NETWORK BODY ECU
OK


3.CHECK WIRE HARNESS (SOLAR SENSOR - MULTIPLEX NETWORK BODY ECU)
E107010E04

  1. Disconnect the M1 solar sensor connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    M1-3 (CLTE) - Body ground
    		Always
    		Below 1 Ω

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    M1-6 (CLTB) - M1-3 (CLTE)
    		Engine switch on (IG)
    		10 to 14 V
    Engine switch off
    		Below 1 V



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER)
E107012E06

  1. Disconnect the M1 solar sensor connector.

  1. Disconnect the L52 A/C amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L52-35 (TSD) - M1-1 (TSL) *1
    		Always
    		Below 1 Ω
    L52-35 (TSD) - M1-2 (TSR) *2
    		Always
    		Below 1 Ω

    HINT:
    1. *1: LHD
    2. *2: RHD



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK SOLAR SENSOR
E107011E06

  1. Remove the solar sensor with its connector still connected.

  1. Apply battery voltage between terminals 6 (CLTB) and 3 (CLTE) of the solar sensor.

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    2 (TSR) *2 - 3 (CLTE)
    		Sensor is subjected to electric light
    		0.8 to 4.3 V
    1 (TSL) *1 - 3 (CLTE)
    		Sensor is subjected to electric light
    		0.8 to 4.3 V
    2 (TSR) *2 - 3 (CLTE)
    		Sensor is covered with a cloth
    		Below 0.8 V
    1 (TSL) *1 - 3 (CLTE)
    		Sensor is covered with a cloth
    		Below 0.8 V

    NOTICE:
    The connection procedure for using a digital tester such as a TOYOTA electrical tester is shown above. When using an analog tester, connect the positive (+) lead to terminal 2 and negative (-) lead to terminal 1 of the solar sensor.

    HINT:
    1. As the inspection light is moved away from the sensor, the voltage increases.
    2. Use an incandescent light for inspection. Bring it about 30 cm (11.8 in.) from the solar sensor.
    3. *1: LHD
    4. *2: RHD



NG
REPLACE SOLAR SENSOR
OK

REPLACE AIR CONDITIONING AMPLIFIER