Dtc B1244 Light Sensor Circuit Malfunction

Body Electrical. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Lighting. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WIRE HARNESS (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)

CHECK OPERATION OF AUTOMATIC LIGHT CONTROL SENSOR

DTC B1244 Light Sensor Circuit Malfunction


DESCRIPTION

This DTC is output when a failure in the automatic light control sensor circuit is detected.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Lighting.Lighting System. Dtc B1244 Light Sensor Circuit Malfunction

  1. Disconnect the E19 main body ECU connector.

  1. Disconnect the F2 automatic light control sensor connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E19-14 (CLTE) - F2-3 (CLTE)
    		Below 1 Ω
    E19-14 (CLTE) or F2-3 (CLTE) - Body ground
    		10 kΩ or higher
    E19-15 (CLTS) - F2-4 (CLTS)
    		Below 1 Ω
    E19-15 (CLTS) or F2-4 (CLTS) - Body ground
    		10 kΩ or higher
    E19-16 (CLTB) - F2-1 (CLTB)
    		Below 1 Ω
    E19-16 (CLTB) or F2-1 (CLTB) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


2.CHECK OPERATION OF AUTOMATIC LIGHT CONTROL SENSOR

  1. Replace the automatic light control sensor with a normally functioning one or a new one.

  1. Check for DTC.

    OK:
    DTC is not output.


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)
OK

REPLACE AUTOMATIC LIGHT CONTROL SENSOR