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 
PROCEDURE
(a) Clear the DTCs. Click here (b) Turn the ignition switch to ON. (c) Turn on the headlights using the light control switch. (d) Check for DTCs. Click here OK: DTC B1244 is not output.
(a) Using the Techstream, read the Data List. Click here (b) 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) Turn the light control switch to the AUTO position. (2) Cover the automatic light control sensor with an opaque object. (3) Slowly move the opaque object to uncover and then cover the automatic light control sensor. Main Body
OK: The value changes according to the amount the automatic light control sensor is covered.
(a) Disconnect the J165 main body ECU (multiplex network body ECU) connector. (b) Disconnect the J176 automatic light control sensor connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(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 Tundra Service Manual > Vehicle Stability Control System: ABS Warning Light does not Come ON
DESCRIPTION The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication. CAUTION / NOTICE / HINT NOTICE: When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibrati ...
