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 HS 250hFACTORY OEM SERVICE PROCEDURE
OEM System Circuits
- Power Source
- Engine Immobiliser System, Luggage Compartment Door Opener, Smart Access System with Push-Button Start, Starting, Steering Lock and Wireless Door Lock Control
- Ignition
- Hybrid System
- Cruise Control or Dynamic Radar Cruise Control
- Lane Keeping Assist
- Data Link Connector 3
- Multiplex Communication System (AVC-LAN)
- Multiplex Communication System (CAN)
- Headlight
- Front Fog Light
- Turn Signal and Hazard Warning Light
- Illumination and Taillight
- Interior Light
- Stop Light
- Back-Up Light
- Door Lock Control
- Power Window
- Sliding Roof
- Theft Deterrent
- ABS, Hill-Start Assist System, TRAC and VSC
- EPS
- Tire Pressure Warning
- SRS
- Pre-Collision System
- Seat Belt Warning
- Electric Tension Reducer
- Rear Sunshade
- Automatic Light Control and Light Auto Turn Off System
- Headlight Cleaner
- Adaptive Front-Lighting System or Headlight Beam Level Control
- Front Wiper and Washer (w/Auto Wiper System)
- Front Wiper and Washer (w/o Auto Wiper System)
- Power Tilt and Power Telescopic
- Power Seat (Driver's Seat w/Seat Position Memory)
- Power Seat (Driver's Seat w/o Seat Position Memory)
- Power Seat (Front Passenger's Seat)
- Remote Control Mirror (w/Seat Position Memory)
- Remote Control Mirror (w/o Seat Position Memory)
- Automatic Glare-Resistant EC Mirror and Compass
- Garage Door Opener
- Front Wiper Deicer
- Mirror Heater and Rear Window Defogger
- Climate Control Seat and Seat Heater
- Power Outlet
- Clock
- Horn
- Fuel Lid Opener
- Parking Assist (Rear View Monitor and Wide-View Front Monitor)
- Parking Assist (Intuitive Parking Assist)
- Audio System (w/LEXUS Navigation System), LEXUS ENFORM, LEXUS Navigation System and Parking Assist (Rear View Monitor) (w/o Wide-View Front Monitor)
- Audio System (w/o LEXUS Navigation System) and Safety Connect
- Combination Meter and Headup Display
- Cooling Fan
- Air Conditioning
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.