Lost or need a spare key fob for your 1999 Lexus RX300? Replacing a key fob can often seem like a daunting and expensive task, often leading car owners straight to the dealership. However, for your 1999 Lexus RX300, programming a new key fob might be something you can tackle yourself right at home. This guide provides you with a step-by-step procedure to program a new key fob for your 1999 Lexus RX300, potentially saving you time and money.
What You’ll Need
Before you begin, ensure you have the following items ready:
- Your 1999 Lexus RX300: Naturally, you’ll need your vehicle present to perform the programming.
- A New Key Fob for 1999 Lexus RX300: Purchase a compatible key fob. Ensure it’s the correct type for your 1999 Lexus RX300 model. You can often find these online, mentioning compatibility with your specific year and model.
- Your Original Master Key (If Available): While not strictly necessary for remote programming in all cases, having your original master key can sometimes be helpful, particularly for immobilizer programming.
Step-by-Step Programming Instructions
The programming process involves two main parts: programming the immobilizer (key recognition) and programming the remote functions (lock/unlock). Follow these steps carefully:
Part 1: Immobilizer Programming (Key Programming)
This section focuses on getting your 1999 Lexus RX300 to recognize the new key so you can start the engine.
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Initiate Programming Mode:
- Insert your original master key into the ignition.
- Fully depress the gas pedal five times.
- Fully depress the brake pedal six times.
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Key Insertion:
- Remove the master key from the ignition.
- Immediately insert the new, unprogrammed key into the ignition. Note that the security light on your dashboard may still be blinking.
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Program the Immobilizer Chip:
- Depress the gas pedal just one time.
- Observe the security light. It should start blinking for approximately 60 seconds. Do not touch any pedals or turn the ignition during this time.
- Wait for the security light to stop blinking. This indicates that the immobilizer chip in your new key is now programmed to your 1999 Lexus RX300.
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Test the Key:
- Insert the newly programmed key into the ignition and attempt to start your 1999 Lexus RX300. If the programming was successful, the engine should start.
Part 2: Remote Programming
Once the immobilizer is programmed, you can proceed to program the remote lock and unlock functions of your new 1999 Lexus Rx300 Key Fob.
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Open Driver’s Door: Ensure the driver’s side door is open throughout the following steps.
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Prepare for Remote Programming:
- Press and hold both the Lock and Unlock buttons simultaneously on your new remote key fob for one second. Release the buttons. Note: You may not see any immediate reaction from your vehicle at this stage.
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Key Cycling:
- Insert the new key into the ignition, and then immediately remove it. Do this one time.
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Door Lock Cycling (First Set):
- With the driver’s door open, use the power lock switch on the door panel to press the Lock button.
- Cycle the Lock/Unlock button on the door panel five times.
- Close the driver’s door control panel area (you can just swing the door partially closed if easier).
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Door Lock Cycling (Second Set):
- Re-open the driver’s door.
- Cycle the Lock/Unlock button on the door panel five times again, just as in the previous step.
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Ignition Cycle:
- Insert the new key into the ignition once more.
- Turn the ignition to the “ON” position, and then immediately turn it back to the “OFF” position. Do this just one time.
- Remove the new key from the ignition.
At this point, you should observe the door locks automatically cycle, locking and then unlocking. This confirms that your 1999 Lexus RX300 has entered remote programming mode and accepted the new remote.
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Final Remote Test:
- Go back to your new remote key fob.
- Press and hold both the Lock and Unlock buttons for one second, then release.
- Press the Lock button once. You should see your 1999 Lexus RX300 doors lock.
- Press the Unlock button once. You should see your driver’s door unlock, signaling successful remote programming.
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Exit Programming Mode: Simply close the driver’s door. This action should exit the programming mode.
Congratulations! You have now programmed a new key fob for your 1999 Lexus RX300. Test both the key and remote functions to ensure everything is working correctly.
[Imagine of a Lexus RX300 key fob. The key fob is black with two buttons, ‘lock’ and ‘unlock’. The Lexus logo is visible on the fob.]
Troubleshooting
If you encounter issues during the programming process, double-check each step and ensure you are following the instructions precisely. Common issues can include:
- Incorrect Key Fob: Ensure the key fob you purchased is specifically compatible with a 1999 Lexus RX300.
- Timing Issues: The timing of pedal presses and key insertions can be crucial. Try repeating the steps with careful attention to timing.
- Immobilizer System Issues: If you consistently fail to program the immobilizer, there might be an underlying issue with your vehicle’s immobilizer system. In this case, professional diagnostics may be required.
If you are still unable to program your key fob after several attempts, it is recommended to consult a qualified locksmith or your local Lexus dealership for assistance. They have specialized tools and expertise to handle key and remote programming for your 1999 Lexus RX300.
Remember to always test your newly programmed key fob thoroughly after completion to guarantee it functions correctly for both starting your vehicle and remote operations.
