Toyota Tundra Service Manual: Driver Side Power Window Auto Down Function does not Operate

DESCRIPTION

If the AUTO DOWN function does not operate, the cause may be one or more of the following:

The master switch has a malfunction.
The driver side motor has a malfunction.
The wiring between the master switch and the driver side motor is open or shorted.

WIRING DIAGRAM

PROCEDURE

1.	CHECK MANUAL UP / DOWN FUNCTION

(a) Check that the manual UP/DOWN function of the master switch can operate the driver door power window.

OK:

Manual UP/DOWN function operates normally.

REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

Toyota Tundra Service Manual > Power Tilt And Power Telescopic Steering Column System: Tilt and Telescopic Manual Switch Circuit Malfunction (B2603)
DESCRIPTION Different voltage values are sent to the multiplex tilt and telescopic ECU by operating the tilt and telescopic switch (headlight dimmer switch assembly). The multiplex tilt and telescopic ECU then judges which motor and in which direction that motor should operate based on the voltage v ...

Toyota Tundra Owners Manual