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
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 AreaB1424/24 Open or short in driver side solar sensor circuit Solar sensorHarness 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
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 NoteSolar 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 toNGAOK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)BOK (When troubleshooting according to the DTC)CB Go to step 4NG3.CHECK WIRE HARNESS (SOLAR SENSOR - MAIN BODY ECU RH)
Disconnect the main body ECU RH connector.
Measure the resistance according to the value(s) in the table below.
Standard resistance:Tester ConnectionConditionSpecified ConditionJ74-6 (CLTB) - K1-6 (CLTB)AlwaysBelow 1 ΩJ74-4 (CLTE) - K1-3 (CLTE)AlwaysBelow 1 ΩJ74-6 (CLTB) - Body groundAlways10 kΩ or higherJ74-4 (CLTE) - Body groundAlways10 kΩ or higherNG REPAIR OR REPLACE HARNESS OR CONNECTOROKREPLACE MAIN BODY ECU RH4.CHECK SOLAR SENSORRemove 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 ConditionK1-1 (TSL) - K1-3 (CLTE)Sensor is subjected to electric light0.8 to 4.3 VK1-1 (TSL) - K1-3 (CLTE)Sensor is covered with a clothBelow 0.8 VStandard voltage:RHD: Tester ConnectionConditionSpecified ConditionK1-2 (TSR) - K1-3 (CLTE)Sensor is subjected to electric light0.8 to 4.3 VK1-2 (TSR) - K1-3 (CLTE)Sensor is covered with a clothBelow 0.8 VNOTICE: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 SENSOROK5.CHECK WIRE HARNESS (SOLAR SENSOR - A/C AMPLIFIER)
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 ConditionJ58-35 (TSD) - K1-1 (TSL)AlwaysBelow 1 ΩJ58-35 (TSD) - Body groundAlways10 kΩ or higherStandard resistance:RHD: Tester ConnectionConditionSpecified ConditionJ58-35 (TSD) - K1-2 (TSR)AlwaysBelow 1 ΩJ58-35 (TSD) - Body groundAlways10 kΩ or higherNG REPAIR OR REPLACE HARNESS OR CONNECTOROKREPLACE AIR CONDITIONING AMPLIFIER