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.
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HOMESERVICE MANUALSLEXUS1993LS 400REPAIR AND DIAGNOSISGENERAL INFORMATIONRESTRAINTSAIR BAG DEACTIVATION PROCEDURESLEXUSSERVICE PRECAUTIONS
1993 Lexus LS 400
Service Precautions
1993 Lexus LS 400SECTION Service Precautions
Observe the following precautions when servicing SRS:
- Disable SRS before servicing any SRS or steering column component. Failure to do this could result in accidental air bag deployment and possible personal injury. See DISABLING & ACTIVATING AIR BAG SYSTEM .
- When trouble shooting SRS, always check for diagnostic codes before disconnecting battery.
- After turning ignition switch to LOCK; position and disconnecting negative battery cable, wait at least 90 seconds before working on SRS. SRS is equipped with a back-up power source that may allow air bag to deploy within 90 seconds after disconnecting negative battery cable.
- In a minor collision in which air bags did not deploy, inspect front air bag sensors and steering wheel pad.
- NEVER use air bag parts from another vehicle. Replace air bag parts with new parts.
- Remove air bag sensors if shocks are likely to be applied to sensors during repair.
- Center air bag sensor contains mercury. After replacement, DO NOT destroy old part. When scrapping vehicle or replacing center air bag sensor, remove center air bag sensor and dispose of it as toxic waste.
- Never disassemble or repair system components. Replace cracked, dented or otherwise damaged system component.
- DO NOT expose front air bag sensors, center air bag sensor assembly, steering wheel pad, passenger-side air bag or seat belt pretensioner to heat or flame.
- When trouble shooting electrical circuits, use a Digital Volt/Ohmmeter (DVOM) with high impedance (10-k/ohm minimum).
- Information labels are attached to air bag components. Follow all notices on labels.
- After servicing SRS, check air bag warning light to ensure system is functioning properly. See SYSTEM OPERATION CHECK .
- Always wear safety glasses when servicing or handling an air bag.
- When placing a live air bag on a bench or other surface, always face air bag and trim cover upward, away from surface. This will reduce motion of module if it is accidentally deployed.
- After deployment, air bag surface may contain deposits of sodium hydroxide, which irritates skin. Always wear safety glasses, rubber gloves and long-sleeved shirt during clean-up. After clean-up, wash hands using mild soap and water.
- When carrying a live air bag module, trim cover must be pointed away from your body to minimize injury in case of accidental deployment.
- If SRS is not fully functional for any reason, vehicle should not be driven until system is repaired and again becomes operational. DO NOT remove bulbs, modules, sensors or other components or in any way disable system from operating normally. If SRS is not functional, park vehicle until it is repaired and functions properly.
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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.