DESCRIPTION The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly. Blower motor speed signals are transmitted in accordance with changes in the duty ratio. If the airflow volume is low or the blower speed cannot be changed, the following factors may be the cause.
WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / Active Test. (e) Perform the Active Test according to the display on the Techstream. Body Electrical > Air Conditioner > Active Test
(a) Disconnect the A16 blower motor with fan sub-assembly connector. (b) Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage:
Standard Resistance:
(a) Disconnect the G35 air conditioning amplifier assembly connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Connect the A16 blower motor with fan sub-assembly connector. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Connect the G35 air conditioning amplifier assembly connector. (b) Turn the engine switch on (IG). (c) Set the blower speed to LO. (d) Using an oscilloscope, check the waveform.
OK: Waveform is similar to that shown in the illustration. HINT: The waveform varies with the blower speed.
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Occupant Classification System(for Gasoline Model): Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected: System See Procedure Lane Departure Alert System (w/ Steering Control) Intelligen ...
