2008 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE

Repair Instruction: Initialization

Procedures necessary when battery terminal is disconnected / reconnected 

PROCEDURES NECESSARY WHEN BATTERY TERMINAL IS DISCONNECTED / RECONNECTED

Necessary Procedures Procedure Details Effects / Inoperative Functions When Necessary Procedures are not Performed Notes
Steering angle sensor initialization Drive the vehicle on a straight road at 35 km/h (22 mph) or more for 5 seconds or longer. VGRS system -
Alarm state cancel Press the key's UNLOCK switch Until UNLOCK switch is pressed, alarm will continue sounding (57 seconds total) Refer to theft deterrent article (see ON-VEHICLE INSPECTION )
Initialize intuitive parking assist system
  1. Fully turn the steering to the right
  2. Fully turn the steering to the left
 Steering sensing function of intuitive parking assist system Drive the vehicle at more than 20 km/h (12 mph) for more than 5 minutes on a straight road with as little traffic congestion as possible.

Procedures necessary when ECU or other parts are replaced 

PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED

Replacement Part Necessary Procedures Effects / Inoperative Functions When Necessary Procedures are not Performed Notes
Hybrid vehicle control ECU
  1. Perform clutch oil pressure value learning initialization
  2. Initialize radar cruise control system
  • Large shift shock
  • Radar cruise control system
  • Perform initialization with power switch ON (READY), shift lever on P and vehicle stopped
  • During learning operation, "T/M LEARNING" appears on meter's multi-information display
Hybrid vehicle transmission assembly Perform clutch oil pressure value learning initialization Large shift shock
  • Perform initialization with power switch ON (READY), shift lever on P and vehicle stopped
  • During learning operation, "T/M LEARNING" appears on meter's multi-information display
Tire pressure warning ECU and receiver
  1. Register transmitter IDs to "MAIN" setting of switch
  2. Register transmitter IDs to "2nd" setting of switch (if necessary)
  3. Initialize tire pressure warning system
  • Tire pressure warning light illumination
  • Tire pressure monitoring function (even if tire is punctured or pressure decreases, it is not detected)
 -
Tire pressure warning valve and transmitter
  1. Register transmitter IDs to "MAIN" setting of switch
  2. Register transmitter IDs to "2nd" setting of switch (if necessary)
  3. Initialize tire pressure warning system
  • Tire pressure warning light illumination
  • Tire pressure monitoring function of replaced wheel (even if tire is punctured or pressure decreases, it is not detected)
 -
Skid control ECU Initialize linear solenoid valve and perform calibration
  • Brake control warning light illumination
  • Brake warning light illumination
  • ABS warning light illumination
  • VSC warning display of multi-information display
  • Master warning light illumination
 -
  • Brake actuator
  • Brake pedal stroke sensor
  1. Bleed air
  2. Clear stored value of linear solenoid valve and calibration data
  3. Initialize linear solenoid valve and perform calibration
  • Brake control warning light illumination
  • Brake warning light illumination
  • ABS warning light illumination
  • Master warning light illumination
 -
Brake pedal
  1. Inspect and adjust brake pedal height
  2. Clear stored value of linear solenoid valve and calibration data
  3. Initialize linear solenoid valve and perform calibration
 Brake does not operate properly -
Yaw rate and acceleration sensor
  1. Clear zero point calibration data
  2. Perform yaw rate and acceleration sensor zero point calibration
  • Master warning light illumination
  • VSC warning display of multi-information display
  • Brake control warning light illumination
  • Brake warning light illumination
  • ABS warning light illumination
  • VSC control is prohibited or operation is incorrect
  • VGRS system
 -
Steering column (Multiplex tilt and telescopic ECU) (Steering lock actuator [Steering lock ECU])
  1. Code registration (immobilizer)
  2. VGRS initialization
  3. VGRS calibration
  • Wireless door lock control function
  • Smart access system with push-button start
  • Engine start
  • Steering wheel is off-center (even if steering wheel is in neutral position, tires are not straight ahead)
 Leads to VGRS actuator spiral cable open malfunction
  • Power steering ECU
  • Power steering link
 Perform rotation angle sensor initialization and torque sensor zero point calibration
  • EPS control
  • Steering effort is different between turning steering wheel to left and right
  • Steering effort varies
  • Rotation angle sensor or torque sensor malfunction DTC is stored
 -
Steering angle sensor
  1. Store steering angle neutral position and maximum steering angle
  2. Acquire steering sensor zero point
 VGRS system Drive the vehicle at more than 20 km/h (12 mph) for more than 5 minutes on a straight road with as little traffic congestion as possible.
Occupant classification ECU
  • Perform zero point calibration
  • Registration ECU data
  • Occupant classification system
  • Passenger airbag ON/OFF indicator
  • Airbag system (Front passenger side)
  • Seat belt warning system (Front passenger side)
 -
Distance control ECU Initialize radar cruise control system
  • Radar cruise control function
  • Pre-collision function
 -
Clearance warning ECU Initialize intuitive parking assist system Steering sensing function of intuitive parking assist system Drive the vehicle at more than 20 km/h (12 mph) for more than 5 minutes on a straight road with as little traffic congestion as possible.
Power window regulator motor assembly (Front RH, front LH, rear right RH, rear right LH) Initialize power window system
  • Door glass AUTO UP/DOWN function
  • Jam protection function
  • Key off (power switch OFF) operation function
  • Wireless transmitter-linked open function
  • Master switch remote control function
 Refer to windshield / window glass article (see INITIALIZATION )
  • ID code box
  • Certification ECU
  • Steering lock ECU
  • Door control receiver
  • Key
  1. Perform identification code registration (key code, ECU code)
  2. Refer to immobilizer article "REGISTRATION " procedures
  3. Perform seat "OPERATION CHECK"
  • Smart access system with push-button start
  • Wireless door lock control function
  • Engine start
  • Seat and mirror memory call operation
 When hybrid vehicle control ECU is replaced, registration of ECU communication ID is necessary
Steering column assembly (Steering lock ECU) Perform VGRS actuator neutral position calibration and initialization Steering wheel is off-center (even if steering wheel is in neutral position, tires are not straight ahead) Leads to VGRS actuator spiral cable open malfunction
  • Removal/installation, replacement or adjustment of anything between steering wheel and tires (not including the tires and wheels) (Example: steering wheel replacement; steering column assembly removal/installation; steering sliding yoke or steering actuator assembly replacement or removal/installation; tie rod replacement, removal/installation or adjustment)
  • Steering control ECU
 Perform VGRS actuator neutral position calibration and initialization Steering wheel is off-center (even if steering wheel is in neutral position, tires are not straight ahead) Leads to VGRS actuator spiral cable open malfunction
Mayday ECU and Mayday battery
  • Mayday ECU initialization
  • Mayday ECU registration / enrollment
 LEXUS link system -
Mayday battery
  • Mayday battery registration
  • Mayday battery confirmation
 DTC 6-1 remains output -
Key
(Only for vehicles with memory call settings present)		 Rerecord memory call function When using memory call, seat positions recorded in seat memory switches must also be rerecorded in key Refer to seat article (see ON-VEHICLE INSPECTION )
  • Sliding roof drive gear (Sliding roof ECU)
  • Sliding roof housing
  • Sliding roof drive cable
 Initialize sliding roof system
  • Auto operation
  • Sliding roof operation after power switch is turned OFF
  • Jam protection function
  • Wireless door lock control function
  • Key-linked operation function (Driver's door only)
  • Entry lock switch-linked operation
 -
  1. RESET MEMORY (FOR HYBRID TRANSMISSION SYSTEM) 
    NOTE:
    • If either the hybrid transmission assembly or hybrid vehicle control ECU is replaced, initialize the learned value of Reset Memory.
    • Wait 1 minute after disconnecting the negative battery terminal before reset memory.
    • The Reset Memory can be performed only with the Techstream.

    HINT:

    Disconnecting the negative battery terminal does not initialize (clear) the learned value.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY) and turn the Techstream on.
      NOTE: Check that the shift lever is in the P position and turn the power switch on (READY).
    3. Select the following menu items: Powertrain / Hybrid Control / Data List. Read the data list before performing Reset Memory.

      Check Item 

      CHECK ITEM

      Item Specified Condition
      +B 9 to 16 V
      WOUT Control Power 1 W or more
      T/M Oil Temperature 10 to 100°C (50 to 212°F)
      NOTE:
      • Do not depress the accelerator pedal during reset memory.
      • Do not move the shift lever from the P position.
      • If the specified conditions above are not satisfied, warm up the engine with the power switch on (READY) until each data meets the specified condition.
    4. Select the following menu items: Powertrain / Hybrid Control / Reset Memory.
    CAUTION: After performing the Reset Memory, be sure to perform the ROAD TEST (See ROAD TEST ) described earlier.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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