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.
1990 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Circuit Protection Devices
CIRCUIT PROTECTION DEVICES LOCATION
| Component | Location | |
|---|---|---|
| Circuit Breakers | ||
| A/C System | Behind left side kick panel. | |
| Defogger | Behind left kick panel | |
| Power Door Locks & Windows | Behind right kick panel. | |
| Sun Roof | Behind left kick panel. | |
| EFI Fuse (20A) | In engine compartment fuse/relay block. | |
| Fuse/Relay Block | ||
| Engine Compartment (2) | On left front of engine compartment, near battery. | |
| Passenger Compartment | Under left side of dash. | |
| Fusible Link (Main) | On battery positive terminal. | |
| Ignition Fuse (7.5A) | In passenger compartment fuse/relay block. | |
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.
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