These instructions apply to the Lexus LC Mk1 (Z1) 2018-Present. For other models, please choose your vehicle here.
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Disconnecting the 12 V battery on your Lexus LC (2018–present) — for a new battery, winter storage, or work near the airbags — catches owners out, because on this GT coupe the 12 V battery isn’t under the bonnet, it’s in the boot.
Find the 12 V Battery First
On both the LC 500 (V8) and the LC 500h hybrid the 12 V battery is in the luggage compartment (boot), under the floor/trim — placed there for weight balance on this front-mid-engined coupe. The under-bonnet terminals are for jump-starting only. On the LC 500h, never touch the orange high-voltage cabling or the hybrid battery; the 12 V is the one you service.
Disconnecting Safely
- Switch off and make sure all electrical consumers are off.
- Lift the boot floor/trim to reach the battery, 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 LC then relearns a few items as you drive:
- Steering angle / stability and parking-assist systems relearn as you drive straight and turn fully each way.
- Power windows — if one-touch is lost, pull-up-and-hold at the top to relearn.
- Re-enter the clock, presets and settings.
If Something Isn’t Right Afterwards
- Warning lights (e.g. VSC/stability) 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 battery (use the correct spec for your LC).
Frequently Asked Questions
Where is the 12 V battery on a Lexus LC?
In the boot (luggage compartment) under the floor/trim, on both the LC 500 and LC 500h — the under-bonnet terminals are only for jump-starting.
Is it safe to disconnect the 12 V on the LC 500h hybrid?
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/stability and parking-assist relearn by driving, windows may need a one-touch relearn, 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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