Lexus IS250 IS220d GSE20 ALE20 - AIR CONDITIONING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

CHECK WIRE HARNESS (SOLAR SENSOR)

CHECK WIRE HARNESS (SOLAR SENSOR - MAIN BODY ECU RH)

CHECK SOLAR SENSOR

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

DTC B1424/24 Solar Sensor Circuit (Driver Side)

DESCRIPTION

Dtc B1424/24 Solar Sensor Circuit (Driver Side). AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

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 decreases. The A/C amplifier detects output voltage from the solar sensor.

DTC No.DTC Detection ConditionTrouble Area
B1424/24 Open or short in driver side solar sensor circuit
Solar sensor
Harness and connector between solar sensor and A/C amplifier
Harness and connector between solar sensor and main body ECU (cowl side junction block ECU RH)
A/C amplifier

WIRING DIAGRAM

Dtc B1424/24 Solar Sensor Circuit (Driver Side). AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • HINT:
If DTC B1244 is output at the same time, troubleshoot DTC B1244 first.
If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output.
1.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

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

Expose the sensing portion of the solar sensor to light.

  • HINT:
  • Use an incandescence light for inspection.

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

Data List / Air Conditioner:
ItemMeasure Item / Display (Range)Normal ConditionDiagnostic Note
Solar Sensor (D side)
(Solar Sens-D)		Driver side solar sensor / Min.: 0, Max.: 255Driver side solar sensor value increases as brightness increases-
  • OK:
  • The display is as specified in the normal condition column.
  • Result:
  • ResultProceed to
    NGA
    OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)B
    OK (When troubleshooting according to the DTC)C
B
Go to step 4
NG
3.CHECK WIRE HARNESS (SOLAR SENSOR - MAIN BODY ECU RH)
Dtc B1424/24 Solar Sensor Circuit (Driver Side). AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the main body ECU RH connector.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    J74-6 (CLTB) - K1-6 (CLTB)AlwaysBelow 1 Ω
    J74-4 (CLTE) - K1-3 (CLTE)AlwaysBelow 1 Ω
    J74-6 (CLTB) - Body groundAlways10 kΩ or higher
    J74-4 (CLTE) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE MAIN BODY ECU RH
4.CHECK SOLAR SENSOR
Dtc B1424/24 Solar Sensor Circuit (Driver Side). AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

Remove the solar sensor with its connector still connected.

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

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

  • Standard voltage:
  • LHD:
  • Tester ConnectionConditionSpecified Condition
    K1-1 (TSL) - K1-3 (CLTE)Sensor is subjected to electric light0.8 to 4.3 V
    K1-1 (TSL) - K1-3 (CLTE)Sensor is covered with a clothBelow 0.8 V
  • Standard voltage:
  • RHD:
  • Tester ConnectionConditionSpecified Condition
    K1-2 (TSR) - K1-3 (CLTE)Sensor is subjected to electric light0.8 to 4.3 V
    K1-2 (TSR) - K1-3 (CLTE)Sensor is covered with a clothBelow 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 negative (-) lead to terminal 2 and positive (+) lead to terminal 1 of the solar sensor.
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:
Use an incandescent light for inspection. Bring it about 30 cm (11.8 in.) from the solar sensor.
As the inspection light is moved away from the sensor, the voltage increases.
NG
REPLACE SOLAR SENSOR
OK
5.CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER)
Dtc B1424/24 Solar Sensor Circuit (Driver Side). AIR CONDITIONING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the solar sensor connector.

Disconnect the A/C amplifier connector.

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

  • Standard resistance:
  • LHD:
  • Tester ConnectionConditionSpecified Condition
    J58-35 (TSD) - K1-1 (TSL)AlwaysBelow 1 Ω
    J58-35 (TSD) - Body groundAlways10 kΩ or higher
  • Standard resistance:
  • RHD:
  • Tester ConnectionConditionSpecified Condition
    J58-35 (TSD) - K1-2 (TSR)AlwaysBelow 1 Ω
    J58-35 (TSD) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE AIR CONDITIONING AMPLIFIER
LEXUS IS250, IS220d / GSE20 ALE20
AIR CONDITIONING
Lexus IS250 IS220d GSE20 ALE20
AIR CONDITIONING SYSTEM