Back door reserve lock lets an equipped 2025 NX lock the side doors immediately and reserve the liftgate lock while the power back door is closing.
Check that your vehicle has it.
Verified in the 2025 U.S. Lexus NX 250/NX 350 owner's manual for vehicles with the power back door.
- Required equipment / service
- NX 250 equipped with power back door, NX 350 equipped with power back door, Power back door and electronic key, NX 250 or NX 350 equipped with power back door
Does the documented scope match your car?
This check combines the verified year, any source-supported powertrain scope, source-named trim/package and required equipment. It does not read a VIN or factory build record.
Published availability and qualifications
Verified in the 2025 U.S. Lexus NX 250/NX 350 owner's manual for vehicles with the power back door.
Know what kind of control to look for.
This original category diagram is an orientation aid, not a picture of your exact trim. Use the written labels and your vehicle manual to identify the real control.
Step by step.
- 01
Remove every electronic key from the cabin and cargo area, and close all doors except the power back door.
- 02
Start an automatic closing operation of the power back door.
- 03
While the back door is closing, press Lock on the wireless remote or use the smart-access lock sensor.
- 04
Wait for the operation signals confirming that the side doors locked.
- 05
After the back door fully closes, confirm the final lock indication and physically verify that the vehicle is locked.
Important limits
- An electronic key placed inside after the closing operation starts may become locked in the vehicle.
- If jam protection prevents the back door from fully closing, reserve lock is canceled and all doors unlock.
- Always verify the final lock indication before walking away.
Quick checks.
- ✓If the vehicle unlocks again, inspect the liftgate path and repeat only after the obstruction or incomplete closure is corrected.
- ✓Confirm that all side doors are fully closed before starting the liftgate close-and-lock sequence.
What happened on your vehicle?
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2025 Lexus NX 350/NX 250 Owner's Manual — Back door reserve lock function
Relevant section or page: Pages 83–84. We use the written official source to determine the steps and applicability shown above.
Reviewed with a visible trail.
Scope and steps were checked by Car Cheat Codes Editorial Review. A guide is narrowed or corrected when the source does not support a broader claim.
- Published
- Last modified
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Guide change history
- Initial verified publication.