DESCRIPTION The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headlights and taillights according to the signal.
WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE: Before replacing the main body ECU (multiplex network body ECU), refer to Registration. Click here PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body / Trouble Codes. (e) Clear the DTCs. Body Electrical > Main Body > Clear DTCs
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Wait 10 seconds or more. (d) Turn the Techstream on. (e) Enter the following menus: Body Electrical / Main Body / Trouble Codes. (f) Check for DTCs. Body Electrical > Main Body > Trouble CodesOK: DTC B1244 is not output.
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body / Data List. (e) According to the display on the Techstream, read the Data List and check that the value of Light Sensor Illuminance changes while performing the following: (1) Cover the automatic light control sensor with an opaque object. (2) Slowly move the opaque object to uncover and then cover the automatic light control sensor. Body Electrical > Main Body > Data List
OK: The value changes according to the amount the automatic light control sensor is covered.
(a) Disconnect the G23 automatic light control sensor connector. (b) Disconnect the G33 main body ECU (multiplex network body ECU) connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Connect the G33 main body ECU (multiplex network body ECU) connector. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Inspect the automatic light control sensor. Click here
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Lighting System(for Gasoline Model): Terminals Of Ecu
TERMINALS OF ECU CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors. (b) Measure the voltage and resistance according to the value(s) in th ...
