Lexus ES: System Description
SYSTEM DESCRIPTION
GRILLE SHUTTER SYSTEM
(a) General description
The swing grille actuator assembly receives signals from the ECM, hybrid vehicle control ECU 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. |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the grille shutter system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Initialization
INITIALIZATION CHANGE GRILLE SHUTTER CONTROL MODE AND/OR PERFORM INITIALIZATION (a) In the following situations, it is necessary to change the grille shutter control mode and/or initialize the grille
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE:
Before performing troubleshooting, change the grille shutter control mode to maintenance mode.
Click here
If the swing grille actuator assembly has been replaced
SEE MORE:
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) When a malfunction occurs in the lane control system, a message will be displayed on the multi-information display and, depending on the malfunction, functions of the lane control system will be disabled. Warning Message Cause Fail-safe Operation Condi
Sound Signal Circuit between Radio Receiver and Stereo Component Amplifier
DESCRIPTION The radio receiver assembly sends a sound signal to the stereo component amplifier assembly via this circuit. The sound signal that has been sent is amplified by the stereo component amplifier assembly, and then is sent to the speakers. If there is an open or short in the circuit, sound
