DESCRIPTION The main body ECU (multiplex network body ECU) receives headlight dimmer switch information signals and illuminates the taillights, license plate lights and front side marker lights. WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE: Inspect the bulbs and fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Using the Techstream, perform the Active Test. Click here
OK: Taillight relay (TAIL) operates (taillights turn on).
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Remove the driver side junction block assembly. Click here 
(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly. Click here (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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Toyota Tundra Service Manual > Front Power Seat Control System(w/ Memory): Wireless-linked Return Function does not Operate
DESCRIPTION When a door is unlocked by the wireless unlock function, the main body ECU (multiplex network body ECU) receives the door unlock signal and it stores the key ID. When the driver door is opened, the memory call and memory command information of the stored key ID is sent to each driving po ...
