Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Window Fogging

DESCRIPTION

If the windshield frequently fogs up even though the air conditioning system is operating, the following factors may be the cause.

Symptom	Factor
Windshield frequently fogs up	Cooler compressor assembly malfunction Refrigerant volume (low) Cooler expansion valve (opened excessively) No. 1 air conditioning radiator damper servo sub-assembly malfunction Mechanical locking of damper and damper link

PROCEDURE

1.	PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

*: If the ambient temperature is not within the range shown, do not perform this check.

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

CHARGE SYSTEM WITH REFRIGERANT

2.	CHECK OPERATION

(a) Press the front defroster switch on the air conditioning control panel (radio and display receiver assembly).

OK:

The air outlet mode changes to DEF mode.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

GO TO DTC B1443

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Theft Deterrent System(for Hv Model): Security Horn Circuit
DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn assembly to sound at intervals of 0.4 seconds. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Before ...

Toyota Avalon (XX50) 2019-2022 Owners Manual