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 > Audio And Visual System: Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION Audio function: This circuit is necessary for the automatic sound levelizer (ASL) built into the radio and display receiver assembly. ASL function: Speed signals are received from the combination meter assembly and used for the ASL. The ASL function automatically adjusts the sound volume ...

Toyota Tundra Owners Manual