Lexus SC 430 2006 Owner's Manual page 242

If the wireless remote control key battery is discharged
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The following symptoms may occur:
The wireless remote control does not function properly.
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The operation distance becomes shorter.
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The brightness of the LED on the remote control decreases or does not light up.
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Use specified lithium battery
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Batteries can be purchased at your Lexus dealer, jeweler, or camera store.
Checking remote control operation after replacing the battery
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Push any of the buttons on the remote control and check that the LED lights up.
CAUTION
Removed battery and other parts
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Keep away from children.
These parts are small and if swallowed by a child they can cause choking.
NOTICE
For normal operation after replacing the battery
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Observe the following precautions when replacing the wireless remote control' s
battery.
Always replace the battery with clean hands.
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Moisture may cause the battery to rust.
Do not touch or move any other components inside the remote control.
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Do not bend either of the battery terminals.
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Do not let foreign objects, oils, etc. enter the module.
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Do not to lose the screws or O-ring.
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Do not to bend or damage the O-ring when replacing the module cover.
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4-3. Do-it-yourself maintenance
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