Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Description

SYSTEM DESCRIPTION

GRILLE SHUTTER SYSTEM

(a) General description

The swing grille actuator assembly receives signals from the ECM, hybrid vehicle control ECU assembly and air conditioning amplifier assembly via CAN communication. Based on these signals, the swing grille actuator assembly operates the radiator shutter sub-assembly.

If a malfunction occurs in the grille shutter system, a warning will be displayed on the multi-information display and grille shutter system operation will be disabled.

(b) Control List

Control

Description

Closing Operation Control

The grille shutter closes when certain conditions related to the vehicle speed, engine coolant temperature, inverter coolant temperature, ambient temperature and refrigerant pressure are met.

Opening Operation Control

The grille shutter opens when certain conditions related to the vehicle speed, engine coolant temperature, inverter coolant temperature, ambient temperature and refrigerant pressure are met.

Power Switch Off-linked Opening Operation Control

Opens the grille shutter when the power switch is turned off in order to prevent the grille shutter from becoming stuck closed while the vehicle is stopped.

Winter Control Mode

Stops the grille shutter at a position other than the fully closed position and suspends grille shutter operation in order to prevent it from becoming stuck closed when the ambient temperature is 5°C (41°F) or lower. Winter control mode is canceled when the ambient temperature becomes 10°C (50°F) or higher.

    Problem Symptoms Table

    System Diagram

    See More:

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