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.
2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Certification ECU | Right side of trunk. See Figure. |
| Clearance Warning ECU | Left side of trunk. See Figure. |
| Cooling Fan ECU | Behind left radiator cooling fan motor. See Figure. |
| Cooling Fan ECU No. 2 | Behind right radiator cooling fan motor. See Figure. |
| Distance Control ECU | Behind left side of dash. See Figure. |
| ECM (Engine Control Module) | Left front of engine compartment. See Figure. |
| Front Position Control ECU & SW (LH) | Below left side of driver's seat. See Figure. |
| Front Position Control ECU & SW (RH) | Below right side of front passenger's seat. See Figure. |
| Headlight Swivel ECU | Left kick panel. See Figure. |
| Main Body ECU (LH) | In left cowl side junction block. See Figure. |
| Main Body ECU (RH) | In right cowl side junction block. See Figure. |
| Multiplex Tilt & Telescopic ECU | On steering column. See Figure. |
| Network Gateway ECU | At right end of dash. See Figure. |
| Occupant Detection ECU | Under front passenger's seat. See Figure. |
| Outer Mirror Control ECU (Left/Right) | In respective front doors. See Figure. |
| Overhead Module | Center front of roof. See Figure. |
| Power Source Control ECU | Behind right side of dash. See Figure. |
| Power Steering ECU | Right rear of engine compartment. See Figure. |
| Seat Belt Control ECU | Left side of trunk. See Figure. |
| Seat Heater Control Sub-Assembly (Left) (U3) | Under driver's seat. See Figure. |
| Seat Heater Control Sub-Assembly (Right) (T2) | Under right front seat. See Figure. |
| Shift Lock Control ECU | Under center console. See Figure. |
| Skid Control ECU | Behind right side of dash. See Figure. |
| Sliding Roof Control ECU | Center front of roof. See Figure. |
| Tire Pressure Warning ECU & Receiver | Behind center of dash. See Figure. |
| Transmission Control ECU | Left side of engine compartment. See Figure. |
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.