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 MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSTOOLS - CUSTOMIZE PROGRAM CARD - VER. 1.1 PRECAUTIONSOPERATION PROCEDURE
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Operation Procedure
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Operation Procedure
RX 300 with Slide Roof (Screen View)
If the "Customize Unsuccessful" Screen (Screen A) appears when attempting to customize an item of the Slide Roof function, perform the following steps:
1. Turn the Ignition Switch to the OFF position.
2. Remove the Dome Fuse, Picture B.
3. Reinstall the Dome Fuse, Picture B.
4. Turn the Ignition Switch to the ON position.
5. Exit back to the "Function Select" Menu (Screen C). Select the desired function to be customized and proceed with customization.
NOTE:
After selecting the item to be customized, the Diagnostic Tester Initializes Communication with the vehicle.
RX 300 without Slide Roof (Screen View)
If the "Customize Unsuccessful" (Screen A) appears when attempting to customize any available electrical functions, perform the following steps:
1. Exit back to the "Function Select" menu (Screen B).
2. Turn the Ignition Switch to the OFF position, Picture B.
3. Turn the Ignition Switch to the ON position, Picture C.
4. At the "Function Select" menu (Screen B), proceed by selecting the desired item to be customized.
NOTE:
After selecting the item to be customized, the Diagnostic Tester Initializes Communication with the vehicle.
If the "Customize Unsuccessful" Screen (Screen A) appears when attempting to customize an item of the Slide Roof function, perform the following steps:
1. Turn the Ignition Switch to the OFF position.
2. Remove the Dome Fuse, Picture B.
3. Reinstall the Dome Fuse, Picture B.
4. Turn the Ignition Switch to the ON position.
5. Exit back to the "Function Select" Menu (Screen C). Select the desired function to be customized and proceed with customization.
NOTE:
After selecting the item to be customized, the Diagnostic Tester Initializes Communication with the vehicle.
RX 300 without Slide Roof (Screen View)
If the "Customize Unsuccessful" (Screen A) appears when attempting to customize any available electrical functions, perform the following steps:
1. Exit back to the "Function Select" menu (Screen B).
2. Turn the Ignition Switch to the OFF position, Picture B.
3. Turn the Ignition Switch to the ON position, Picture C.
4. At the "Function Select" menu (Screen B), proceed by selecting the desired item to be customized.
NOTE:
After selecting the item to be customized, the Diagnostic Tester Initializes Communication with the vehicle.
RENDER: 1.0x
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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.