ECB (ELECTRONICALLY CONTROLLED BRAKE) SYSTEM General Basic construction and operation is same as LS460 Regenerative Brake Cooperative Control Function Basic construction and operation is same as LS460. The LS600h has as the GS450h a Regenerative Brake Cooperative Control Function: Regenerative brake consists of a resistance force that is generated at the rotational axle in the reverse direction of the rotation of the generator (MG2) that is generating electricity. The greater the generated amperage (battery charging amperage), the greater will be the resistance force. The drive axle and MG2 are joined mechanically. When the drive wheels rotate MG2 and cause it to operate as a generator, a regenerative brake force of MG2 is transmitted to the drive wheels. This force is controlled by the THS II, which controls the generation of electricity. The regenerative brake cooperative control does not rely solely on the braking force of the hydraulic brake system to supply the brake force required by the driver. Instead, by effecting cooperative control with the THS II, this control provides a joint braking force provided by the regenerative brake and the hydraulic brake. As a result, this control minimizes the loss of the kinetic energy associated with the normal hydraulic brake, and recovers this energy by converting it into electrical energy.

ACTIVE STABILIZER SUSPENSION SYSTEM Overall Enhanced cornering ability to decrease an amount of roll by controlling twist of the front / rear stabilizer bars for the vehicle posture control during cornering To decrease rolling angle during cornering To change steering characteristic by driving conditions Active stabilizer suspension system is equipped for all models except VIP??? Package model as STD. This system controls an amount of roll. AVS (Adoptive Variable Suspension System) controls a speed of roll : Stabilizer bar effect : Active stabilizer suspension system effect

ACTIVE STABILIZER SUSPENSION SYSTEM HV Battery Unit DC/DC Converter for EPS and Active stabilizer Main Components Air Suspension ECU Rear Active Stabilizer ECU Steering Control ECU Rear Active Stabilizer Actuator Skid Control ECU Front Active Stabilizer Actuator Front Active Stabilizer ECU Damping Mode Select Switch

ACTIVE STABILIZER SUSPENSION SYSTEM Major Difference from GS450h LS600hL/LS600h GS450h Power Supply HV Battery Excusive Battery Drive Voltage of Active Stabilizer Actuator AC 46 V (Step down HV battery nominal voltage) AC 14 V (Battery voltage) DTC  Some DTCs are newly added and discontinued Output CAN SIL (Fr ECU) Reset Memory No required Required Active Test Available Data List 3 items are newly added Test Mode (System Check) Reset memory Reset the current value and compensation value of the exclusive battery

ACTIVE STABILIZER SUSPENSION SYSTEM Steering Angle Sensor Yaw Rate Sensor Steering Control ECU Suspension Control ECU Deceleration Sensor System Diagram AC 46 V AC 46 V Front Active Stabilizer Actuator Front Active Stabilizer Control ECU Rear Active Stabilizer Control ECU Rear Active Stabilizer Actuator Motor Motor Motor Rotation Sensor Motor Rotation Sensor DC 46 V DC/DC Converter [EPS /Active Stabilizer Suspension] Function of Main Components Front and Rear Active Stabilizer Control ECU: - Calculates the target twist angle of the active stabilizer actuator and actuates the active stabilizer actuator in accordance with the signals received from the sensors. - Converts the direct current from the DC/DC converter for EPS and active stabilizer suspension into three-phase alternating current. - Communicates with the front and rear active stabilizer control ECUs to keep optimally balancing the twist angles of both the front and rear active stabilizer actuators. Front and Rear Active Stabilizer Actuator: Twist the stabilizer bar in accordance with the signals received from the active stabilizer control ECU, in order to control the roll angle of the vehicle. DC/DC Converter for EPS and Active Stabilizer Suspension: Steps down the nominal voltage of the HV battery from DC 288V into DC 46 V and supplies electrical power to the active stabilizer control ECUs. Steering Angle Sensor: Detects the steering angle of the steering wheel and transmits them to the active stabilizer control ECUs. Yaw Rate Sensor: Detects the yaw rate and the longitudinal and lateral acceleration and deceleration of the vehicle body and transmits them to the active stabilizer control ECUs. Steering Control ECU: Transmits VGRS actuator operating angle signals to the active stabilizer control ECUs. Suspension Control ECU: Transmits the damping force mode (NORMAL, COMFORT or SPORT) signals to the active stabilizer control ECUs. Damping Mode Select Switch DC 288 V Speed Sensors Center Console Switch Module HV Battery Skid Control ECU Driver Side Switch Module Main Body ECU Meter ECU Multi-information Display Master Warning Light Buzzer DLC3

ACTIVE STABILIZER SUSPENSION SYSTEM Vehicle Roll Angle Amount of twisting the stabilizer bar are controlled based on signals of actual turning angle of tire, vehicle speed, lateral acceleration, and AVS mode OPERATING CONDITIONS Shift position except “R” and “N” range Vehicle speed is satisfied following condition CHARACTERISTIC OF ROLL ANGLE Lateral Acceleration Vehicle Roll Angle ON Active stabilizer system stops operation, when the following conditions occur: Vehicle speed dropped to 5 km/h (3.2 mph) Shift lever in “R” or “N” range Malfunction occurred in this system or high-voltage circuit OFF 5 km/h (3.2 mph) 20 km/h (12.5 mph) Vehicle Speed : with System : without System

ACTIVE STABILIZER SUSPENSION SYSTEM Active Stabilizer Actuator Each stabilizer bar position is kept to the neutral position by the vehicle’s weight, when system is OFF Each stabilizer bar position is not fixed, however is not free Motor Short Relay is located in the active stabilizer actuator to fix each stabilizer bar position, when the malfunction occurs in this system Motor Characteristic: When the motor is driven from output side while having short circuit the motor terminal, the counter electromotive force is generated in the motor, and as result, it becomes difficult to rotate the motor. CONDITIONS ACTIVE STABILIZER ACTUATOR [STABILIZER BAR CONDITIONS] System OFF Not fixed, not free System ON Not satisfied operating conditions Fixed (Controlled by ECU) Satisfied operating conditions Active (Controlled by ECU) In fail-safe Fixed (Controlled by motor short relay)

ACTIVE STABILIZER SUSPENSION SYSTEM Warning Message System condition check by multi-information display SYSTEM CONDITION MULTI-INFORMATION DISPLAY MASTER WARNING LIGHT NOTES System Malfunction ON Malfunction detected in this system Diagnosis Mode No DTC OFF System normal Stored DTC DTC stored in ECU Diagnosis Mode: Using SST, connect terminals TC (13) and CG (4) of the DLC3.

SERVICE POINT (ACTIVE STABILIZER SUSPENSION SYSTEM) Active Test In active test mode, each active stabilizer control ECU operates each active stabilizer actuator automatically. SELECT: CHASSIS > FRONT STABILIZER OR REAR STABILIZER > ACTIVE TEST TESTER DISPLAY TEST PART CONTROL RANGE DIAGNOSTIC NOTE Stabilizer Check Front active stabilizer actuator The following operation is operated every one second automatically Front side of the vehicle leans to the right Keep above condition Return normal Front side of the vehicle leans to the left Return normal again If operation is prohibited through fail-safe control, Active Test cannot be performed Rear active stabilizer actuator Rear side of the vehicle leans to the right Rear side of the vehicle leans to the left

SERVICE POINT (ACTIVE STABILIZER SUSPENSION SYSTEM) Active Test If Active Test does not operate, test mode DTCs are output DTC FOR ACTIVE TEST DTC NO. DIAGNOSIS ITEMS INSPECTION ITEMS C194F Operation of Static Test Mode is Incomplete (Test Mode DTC) Test mode operation error Steering angle sensor C1950 Front Stabilizer Target Angle Not Attained (Test Mode DTC) Active stabilizer actuators Active stabilizer ECUs Wire harness C1951 Rear Stabilizer Target Angle Not Attained (Test Mode DTC) If this system malfunction DTCs are already stored, test mode DTCs re not stored

SERVICE POINT (ACTIVE STABILIZER SUSPENSION SYSTEM) Initialization and Calibration Items After disconnecting auxiliary battery PARTS PROCEDURE IF INITIALIZATION DOES NOT OPERATE, THE FOLLOWING FUNCTIONS ARE NOT WORKED Steering Angle Sensor Drive vehicle on a straight road at 35 km/h (22 mph) or more for 5 sec. or more Active stabilizer control functions are not working (Roll angle may not decrease during cornering)

STEERING Overall Vehicle speed sensing type EPS system and VGRS system are used for all models as STD MAJOR DIFFERENCE FROM LS460L / LS460, GS450h LS600hL / LS600h LS460L / LS460 (Model with VGRS/ 19-inch wheels) GS450h Steering Gear Type Rack and Pinion  Gear Ratio (Overall) 12.4 to 19.3 11.6 to 16.7 12.4 to 17.2 No. of Turns Lock to Lock 2.5 to 3.9 2.4 to 3.5 3.16 Drive Voltage of EPS Motor AC 46 V (Step down HV battery voltage) AC 46 V (Boost up Battery voltage) AC 14 V (auxiliary battery voltage) Power Supply Device DC/DC Converter for EPS and Active Stabilizer Boost Converter (for EPS)  Rack assist type EPS is used Mechanical construction of the steering gear unit and the VGRS actuator are the same as the LS460L / LS460 and GS450h. Power tilt and power telescopic mechanism with memory function is used.

STEERING System Diagram AC 33 – 46 V DC 33 – 46 V DC 12 V DC 288 V Steering Gear Unit Rotation Angle Sensor EPS Motor Torque Sensor Lock Solenoid System Diagram VGRS Actuator Motor AC 33 – 46 V Rotation Angle Sensor Steering Control ECU Power Steering ECU Parking Assist ECU DC 33 – 46 V DLC3 DC/DC Converter [EPS /Active Stabilizer Suspension] HV ECU EPS System Power steering ECU, steering control ECU, steering angle sensor, skid control ECU, speed sensors, parking assist ECU (model with intelligent parking assist system), HV ECU and combination meter (PS warning light, multi-information display, master warning light and buzzer) VGRS System Steering control ECU, power steering ECU, suspension control ECU, yaw rate and deceleration sensor, skid control ECU, speed sensors, steering angle sensor, driving support ECU (model with pore-collision system) and combination meter (multi-information display, master warning light and buzzer) Combination Meter DC 12 V DC 288 V Auxiliary Battery HV Battery Skid Control ECU Suspension Control ECU Speed Sensors Steering Angle Sensor Yaw Rate Sensor Driving Support ECU Deceleration Sensor

STEERING Layout of Main Components HV Battery Unit DC/DC Converter for EPS and Active stabilizer Parking Assist ECU Air Suspension ECU Auxiliary Battery Steering Control ECU Power Steering ECU Driving Support ECU Skid Control ECU HV ECU Steering Gear Unit Torque Sensor EPS Motor Rotation Angle Sensor VGRS Actuator Motor Rotation Angle Sensor Lock Solenoid

STEERING DC/DC Converter for EPS and Active Stabilizer Usually, DC/DC converter steps down the HV battery voltage from DC 288 V to DC 46 V and supplies electrical power to the power steering ECU. EPS Motor High-voltage use permission signal DC/DC CONVERTER [EPS /Active Stabilizer Suspension] AC 46 V HV ECU Power Steering ECU DC/DC converter supplies electrical power of DC 46 V to the Fr/Rr active stabilizer ECU in the same way. HV Battery DC 288 V Step Down Circuit Shut Down Circuit DC 12V Boost Converter Circuit Auxiliary Battery To Fr/Rr Active Stabilizer ECU Boost Circuit

STEERING DC/DC Converter for EPS and Active Stabilizer When there are any HV battery voltage problems, the DC/DC converter temporarily converts the auxiliary battery voltage from DC 12 V to approx. DC 33 V and supplies electrical power to the power steering ECU. EPS Motor High-voltage use permission signal DC/DC CONVERTER [EPS /Active Stabilizer Suspension] AC 46 V AC 33 V HV ECU Power Steering ECU However, during fail-safe operation, DC/DC converter does not supply electrical power to the Fr/Fr active stabilizer ECU. When the DC/DC converter changes to the fail-safe operation mode, power steering ECU will output the DTC C1546 or C1562 and PS warning light illuminates. - C1546: Malfunction in HV ECU - C1562: DC / DC Converter PIG Power Supply Voltage HV Battery DC 288 V Step Down Circuit Shut Down Circuit Auxiliary Battery DC 12V Boost Converter Circuit To Fr/Rr Active Stabilizer ECU Boost Circuit

SERVICE POINT (STEERING) Initialization and Calibration for Steering System *: Straight-ahead judgment conditions are required EPS VGRS Initialization Calibration Battery reconnection * -  Replacement Power Steering ECU  Steering Control ECU Removal/installation, replacement or adjustment of steering system parts Steering Gear Unit Initialization and Calibration for Steering System is the same as the LS460L / LS460. EPS System - Calibration: Means the rotation angle sensor value initialization and torque sensor zero point calibration VGRS System - Initialization: Means the steering angle sensor initialization - Calibration: Means the actuator angle initialization and actuator angle adjustment - Relation pats for initialization and calibration: VGRS: Steering column, steering intermediate shaft, steering wheel (off-center)

REFERENCE

ACTIVE STABILIZER SUSPENSION SYSTEM Active Stabilizer Actuator DC brushless motor and reduction gear twist stabilizer bar on both sides NOTE: Active stabilizer actuator is non-disassemble parts Stator Coil Rotor Gear Reduction Mechanism (Strain Wave Gearing Mechanism) Front Stabilizer Bar (LH) The motor is high power output, brushless type motor that is driven by a voltage of 46 V. Front Front Stabilizer Bar (RH) Brushless Motor Motor Rotation Sensor (3 Hall ICs)

ACTIVE STABILIZER SUSPENSION SYSTEM Active Stabilizer Actuator Reduction mechanism Both stabilizer bar shifts 2 teeth per wave generation 1 rotation Front Stabilizer Bar (RH) 402 teeth 400 teeth Front Stabilizer Bar (LH) Reduction mechanism is the same as the mechanism for VGRS on LS460L/LS460. Rotor Gear Wave Generator Flexible Gear Circular Gear Gear Ratio : 1/200

REFERENCE (ACTIVE STABILIZER SUSPENSION SYSTEM) Reduction Mechanism Construction Stator Gear Flexible Gear Wave Generator Ball Bearing is between flexible gear and wave generator Meshing Flexible gear is oval shaped by wave generator NOTE: Indicate this is the reduction mechanism as VGRS system for GS430 example View from stator gear side (Steering wheel side) Not meshing

REFERENCE (ACTIVE STABILIZER SUSPENSION SYSTEM) Reduction Mechanism Operation of strain wave gearing Motor Shaft Flexible Gear (100 teeth) Wave Generator Ball Bearing (Between flexible gear and wave generator) Stator Gear (102 teeth) View from stator gear side (Steering wheel side)

REFERENCE (ACTIVE STABILIZER SUSPENSION SYSTEM) Reduction Mechanism Operation of strain wave gearing [Operation of strain wave gearing] 1. Flexible gear is flexed into an oval shape by wave generator 2. Flexible gear teeth meshes with stator gear teeth and driven gear 3. During wave generator rotation, the meshed area of the flexible gear and stator gear / driven gear moves in sequence 4. After the wave generator makes one turn, the flexible gear is shifted by 2 teeth because the flexible gear has 2 fewer teeth than the stator gear 5. The driven gear and flexible gear have the same number of teeth, so their rotational movements are identical 6. The flexible gear is shifted by 2 teeth = The driven gear shifted by 2 teeth (= Actuator output) Stator gear fixed View from stator gear side (Steering wheel side)

STEERING VGRS Actuator VGRS actuator is relocated and spiral cable is discontinued Input Strain Wave Gearing Output Motor Lock Mechanism VGRS actuator is relocated at pinion shaft. (On the EPS torque sensor) By the relocation, spiral cable is discontinued. Torque Sensor (for EPS) Torsion Bar Pinion Shaft

STEERING VGRS Actuator Strain wave gearing LS460 GS430 [ ]: Number of teeth Stator Gear [102] Specification of the strain wave gearing is changed from GS430. - Driven gear is changed from “output” to “input” - Stator gear is changed from “input” to “output” - Reduction Ratio of strain wave gearing is 51 Driven Gear [100] LS460 GS430 Flexible Gear [100]