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.

1999 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

Component Locations (LS400)

COMPONENT LOCATIONS (LS400)

Component	Location
Engine Control Module (ECM)	Under Right Side Of Instrument Panel, Near Glove Box
Park/Neutral Position (PNP) Switch	On Side Of Transmission
Starter Relay	Forward Of Left Front Strut Tower, In Fuse/Relay Block
Starter Solenoid	On Starter

Factory Service Tools

Use the Manual With the Right Hardware

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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.