These instructions apply to the Honda Jazz Mk4 (GR) 2020-Present. For other models, please choose your vehicle here.
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The Honda Jazz Mk4 (GR, 2020–present) is an e:HEV hybrid, so it has a high-voltage traction battery (never touch it) and a small 12 V battery that runs the electronics. This guide covers safely disconnecting the 12 V battery — the one you change or isolate for electrical work.
Important: Which Battery This Is
You only ever work on the 12 V battery. Never touch the orange high-voltage cables or the traction battery — that system is for trained technicians. The 12 V job below is owner-safe.
Where the 12V Battery Is
On the Jazz e:HEV the 12 V battery is in the engine compartment, under a cover.
Disconnecting
- Switch the car fully off (not “ready”) and keep the smart key away from the car.
- Wait 3 minutes after switching off before disconnecting.
- Disconnect the negative (−, black) terminal first and lift the lead clear.
- If removing the battery, disconnect the positive (+, red) next, then the hold-down.
Airbag/pretensioner safety: if you’ll be near airbags or seat-belt pretensioners, allow the system to discharge for the 3 minutes.
Reconnecting
- Reconnect positive (+) first, then negative (−) last; tighten and refit the cover.
- Reset the clock and re-enter radio presets.
- Recalibrate the tyre-pressure (deflation) monitor — see our Jazz Mk4 TPMS guide.
The Jazz doesn’t need the new 12 V battery coded.
Frequently Asked Questions
Is it safe to disconnect the 12V battery on the hybrid?
Yes — the 12 V system is isolated from the high-voltage side. Just leave the orange cables and traction battery alone.
Which terminal first?
Disconnect negative (−) first and reconnect it last.
Where is the 12V battery on the Jazz hybrid?
In the engine bay under a cover.
Does it need the battery registered?
No — just reset the clock and recalibrate the deflation monitor.
For any warning light that stays on, look up the code on autodtcs.com. To clear the service reminder, see our Jazz Mk4 service reset guide.
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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