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 > Can Communication System: Fail-safe Chart
FAIL-SAFE CHART 1. FAIL-SAFE FUNCTION (a) When communication fails in any of the main wires (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning. (b) The table below shows the effe ...
