DESCRIPTION The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera.
WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE: First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom Click here HINT: If the forward recognition camera stores a DTC for a malfunction of any of the following, this DTC will be stored simultaneously.
PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: System Select / Health Check. (e) Check for DTCs.
(a) Check if a dynamic radar cruise control system, lane departure alert system and pre-collision system warning message are displayed on the combination meter assembly. Click here OK: No dynamic radar cruise control system, lane departure alert system and pre-collision system warning messages are displayed.
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Toyota Tundra Service Manual > Sfi System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas ...
