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.
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If the swing grille actuator assembly has been replaced
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Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) The hybrid vehicle control ECU has a self-diagnosis system. If the computer, hybrid control system, or a component is not working properly, the ECU records the conditions that relate to the fault. The ECU also illuminates the master warning light in the combination m
Inspection
INSPECTION PROCEDURE 1. INSPECT VACUUM SWITCHING VALVE (for Active Control Engine Mount System) (a) Measure the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 1 - 2 20°C (68°
