Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Lexus CT 200h BaseFACTORY OEM SERVICE PROCEDURE
Repair Instruction: Initialization: Initialization
- PROCEDURES NECESSARY WHEN BATTERY TERMINAL IS DISCONNECTED/RECONNECTED
Necessary Procedures Effect / Inoperative Function When Necessary Procedures are not Performed See Test Correct the steering angle neutral point Parking assist monitor system Refer to INITIALIZATION Back door lock Power door lock control system Refer to INITIALIZATION NOTE:- After the power switch is turned off, the navigation computer sub-assembly (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) auxiliary battery terminal.
- When the auxiliary battery is replaced or the cable is disconnected from its negative (-) auxiliary battery terminal, the ISC learning value will be initialized and symptoms as a loud rattle from the hybrid vehicle transaxle assembly may occur until ISC learning is performed. Therefore, perform ISC learning when the auxiliary battery is replaced or the cable is disconnected from the negative (-) terminal of the auxiliary battery. Refer to Loud Rattle from Hybrid Vehicle Transmission .
- PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED
Replacement Part Necessary Procedure Effect / Inoperative Function when Necessary Procedures are not Performed See Test ECM Vehicle Identification Number (VIN) registration MIL comes on Refer to REGISTRATION Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly (Dynamic radar cruise control system) - Dynamic radar cruise control system
- Pre-collision system
Refer to ADJUSTMENT - Tire pressure warning ECU
- Tire pressure warning valve and transmitter
- Code registration (Tire pressure warning system)
- Initialization
- When DTC detection conditions of "transmitter ID not received" DTC are met, TPWS indicator blinks for 1 minute, and then illuminates.
- Tire pressure warning function
Refer to INITIALIZATION for initialization
Refer to REGISTRATION for registrationBrake booster with master cylinder (Skid control ECU, brake actuator or pressure sensor) - Initialization and calibration of the linear solenoid valve
- Yaw rate and acceleration sensor zero point calibration
- ABS warning light illumination
- Slip indicator light illumination
- Brake warning light / yellow (minor malfunction) illumination
- VSC disabled or malfunctioning
Refer to INITIALIZATION for initialization
Refer to CALIBRATION for calibration- Brake pedal stroke sensor
- Brake pedal
- Clearing stored linear solenoid valve calibration data
- Initialization and calibration of the linear solenoid valve
- ABS warning light illumination
- Slip indicator light illumination
- Brake warning light / yellow (minor malfunction) illumination
- VSC disabled or malfunctioning
Yaw rate and acceleration sensor - Clearing zero point calibration data
- Yaw rate and acceleration sensor zero point calibration
- ABS warning light illumination
- Slip indicator light illumination
- Brake warning light / yellow (minor malfunction) illumination
- VSC disabled or malfunctioning
Power steering ECU assembly Rotation angle sensor initialization and torque sensor zero point calibration - P/S warning light comes on
- EPS control
Refer to CALIBRATION Steering column assembly Rotation angle sensor initialization and torque sensor zero point calibration Steering effort is different between turning steering wheel to left and right Spiral with sensor cable sub-assembly - Correct steering angle neutral point
- Steering angle setting
Parking assist monitor system Refer to CALIBRATION Parking assist ECU Parking assist ECU initialization Parking assist monitor system - Suspension, tires, etc.
- Rear television camera assembly
Rear television camera optical axis adjustment (Back camera position setting) Parking assist monitor system - Map light assembly
- Garage door opener transmitter
Re-registration of codes in the garage door opener system - Register transmitter code
- Rolling code systems
Garage door opener system Refer to REGISTRATION DCM (Telematics Transceiver) DCM activation Safety connect system Refer to DCM ACTIVATION - Certification ECU (smart key ECU assembly)
- ID code box (immobiliser code ECU)
- Transmission control ECU assembly
- Key
Code registration (Engine immobiliser system) - Wireless door lock control system
- Smart access system with push-button start system
- Hybrid control system start
Refer to REGISTRATION - Occupant classification ECU
- Front passenger seat
- Zero point calibration (Occupant classification system)
- Sensitivity check (Occupant classification system)
- Occupant classification system
- Passenger airbag ON/OFF indicator
- Airbag system (Front passenger side)
- Seat belt warning system (Front passenger)
Refer to INITIALIZATION - Power window regulator motor assembly
- Door window regulator
- Door grass and/or door grass run etc
Initialize power window control system - Automatic door glass open/ close function
- Jam protection function
- Operation function after power switch is turned off
Refer to INITIALIZATION - Sliding roof ECU (sliding roof drive gear sub-assembly)
- Sliding roof housing
- Sliding roof glass
Initialize sliding roof ECU (pulse sensor initial position setting) - Automatic function of sliding roof
- Jam protection function
- Operation function after power switch is turned off
Refer to INITIALIZATION AFS ECU (headlight swivel ECU assembly) Perform AFS ECU (headlight swivel ECU assembly) initialization - Automatic level function
- AFS function
Refer to INITIALIZATION Rear height control sensor sub-assembly RH Perform AFS ECU (headlight swivel ECU assembly) initialization Automatic level function
Factory Service Tools
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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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