DESCRIPTION When the battery saving control operates, the main body ECU (multiplex network body ECU) controls the operation of the DOME CUT relay that is built into the driver side junction block assembly to turn off the interior lights. WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Perform the Active Test according to the display on the Techstream. Click here
OK: All of the interior lights turn off when ON is selected.
(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 > Power Tilt And Power Telescopic Steering Column System: Tilt Position Sensor or Tilt Motor Circuit Malfunction (B2610)
DESCRIPTION The tilt motor (steering column assembly) is operated by the power source voltage supplied from the multiplex tilt and telescopic ECU and tilts the steering column up and down. The tilt position sensor (Hall IC) in the tilt motor (steering column assembly) detects the tilt angle of the s ...
