DESCRIPTION The main body ECU (multiplex network body ECU) detects a high beam headlight illumination request signal of the automatic high beam system from the forward recognition camera.
WIRING DIAGRAM 
PROCEDURE
(a) Check the forward recognition camera system. Click here
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Toyota Tundra Service Manual > Seat Heater System: System Description
SYSTEM DESCRIPTION 1. GENERAL (a) By operating the seat heater switch, which is located in the air conditioning control assembly, the temperature is controlled to 3 settings. LOWEST: 32.5°C (90.5°F) MID: 44.5°C (112.1°F) HIGH: 58.25°C (136.85°F) (b) Whether the seat heater is on or off can be ...
