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.
1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Transmitter Battery Test
NOTE:
If it is difficult or impossible to operate the system, use this procedure to indirectly test for a weak transmitter battery.
- Remove screw, cover, "O" ring and battery from ignition key. Connect 2 new 1.5-volt dry-cell batteries in series. See Fig 1. Connect positive lead to side terminal and negative lead to bottom terminal.
- Push transmitter button. If door locks operate, replace transmitter battery. If door locks do not operate, replace transmitter and ROM (ROM is inside of remote door lock ECU). To prevent reuse, destroy old transmitter and ROM.
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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