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 > Headlight Assembly(for Halogen Headlight): Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. REMOVE RADIATOR GRILLE SUB-ASSEMBLY 2. REMOVE FRONT END PANEL LH 3. REMOVE HEADLIGHT ASSEMBLY LH (a) Put protective tape around the headlight assembly LH. ...