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 > Transfer Assembly: Reassembly
REASSEMBLY CAUTION / NOTICE / HINT HINT: Coat all of the sliding and rotating surfaces with Toyota Genuine Transfer gear oil LF 75W or equivalent before reassembly. PROCEDURE 1. INSTALL TRANSFER CASE OIL SEAL (a) Using SST and a hammer, tap in a new transfer case oil seal as shown in the illustratio ...