These instructions apply to the Lexus NX Mk2 (Z2) 2022-Present. For other models, please choose your vehicle here.
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Disconnecting the 12 V battery on your Lexus NX (2022–present) — for a new battery, winter storage, or work near the airbags — is simple once you know the 12 V isn’t under the bonnet. On the NX 350h hybrid and NX 450h+ plug-in it’s in the boot.
Find the 12 V Battery First
The 12 V battery is in the luggage area (under the boot floor) — the under-bonnet terminals are for jump-starting only. This 12 V battery is the one you service; never touch the orange high-voltage cabling or the traction battery.
Disconnecting Safely
- Switch off and make sure all electrical consumers are off.
- Wait about 1 minute after switching off before disconnecting.
- Lift the boot floor, then disconnect the negative (−) terminal first, then the positive.
- Working near airbags or pretensioners? Wait 90 seconds after disconnecting before such work.
Reconnecting and Re-initialising
Reconnect positive first, then negative. The NX then re-initialises a few items, mostly by driving:
- Steering angle / driver-assist relearn as you drive straight and turn fully each way.
- Power tailgate: if it won’t operate automatically, simply unlock the tailgate with the key/remote to re-sync it.
- Re-enter the clock, presets and settings.
If Something Isn’t Right Afterwards
- Steering or assist warning lights usually clear once the relearns complete after a short drive.
- A persistent light stores a code — look it up on autodtcs.com.
- Fit a like-for-like aux battery (the NX uses a specific type).
Frequently Asked Questions
Where is the 12 V battery on a Lexus NX (2022 on)?
In the luggage area under the boot floor — the under-bonnet terminals are only for jump-starting.
Is it safe to disconnect the 12 V on the hybrid or PHEV?
Yes — the 12 V is separate from the high-voltage system; never touch the orange HV cabling.
Which terminal first?
Negative (−) off first, reconnect it last.
What needs resetting afterwards?
Steering-angle and driver-assist relearn by driving; the power tailgate re-syncs when you unlock it with the key; plus the clock and presets.
If a warning light stays on after reconnecting, look up the code on autodtcs.com.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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