DTC B1244: Light Sensor Circuit Malfunction: Procedure
WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- READ VALUE USING TECHSTREAM
- Connect the Techstream to the DLC3.
- Turn the ignition switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Body Electrical / Body / Data List.
- Read the display on the Techstream.BODY (BODY ECU)
Tester Display Measurement Item/Range Normal Condition Diagnostic Note Illumination Rate Illumination rate information / 0 ms to 99.99 ms 0.8 ms to 22.0 ms (Value is output according to ambient light levels) - OK
Normal condition listed above is displayed.
NG → See step 2
OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- CHECK HARNESS AND CONNECTOR (BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)
- Disconnect the automatic light control sensor connector and D7 connector of the multiplex network body ECU.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition CLTE (F1-3) - CLTE (D7-4) Always Below 1 Ω CLTS (F1-5) - CLTS (D7-5) Always Below 1 Ω CLTB (F1-6) - CLTB (D7-6) Always Below 1 Ω CLTE (D7-4) - Body ground Always 10 kΩ or higher CLTS (D7-5) - Body ground Always 10 kΩ or higher CLTB (D7-6) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- INSPECT AUTOMATIC LIGHT CONTROL SENSOR
- Inspect automatic light control sensor. Refer to ON-VEHICLE INSPECTION
.
OK
Automatic light control sensor is normal.
NG → REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- Inspect automatic light control sensor. Refer to ON-VEHICLE INSPECTION
.