These instructions apply to the DS 7 Crossback Mk1 (X74) 2017-Present.
For other models, please choose your vehicle here.
Disconnecting the 12 V battery on your DS 7 Crossback (2017–present) — for a new battery, winter storage, or work near the airbags — needs the “sleep” precaution before you touch the terminals. This is a car with a lot of onboard electronics, so a couple of minutes of patience up front saves a lot of head-scratching afterwards. Get the wait right, use the correct terminal order, and the DS 7 comes back cleanly. Here is the safe sequence, including the E-Tense plug-in hybrid.
Where the 12 V Battery Is
The 12 V battery is in the engine bay, generally under a cover or trim panel you unclip to reach the terminals. You will find two posts: the negative (−) is the black one marked with a minus, and the positive (+) is the red one, usually under a hinged cap, marked with a plus. Identify both before you start — the order matters. On the E-Tense plug-in hybrid, this 12 V battery is still the one you service; never touch the orange high-voltage cabling or the traction battery, which is strictly a workshop job.
Before You Disconnect
- Switch the ignition off and make sure the car is fully asleep, not just idle.
- Close the windows and the sunroof so you can re-initialise them cleanly later.
- Remove the key and step well away so keyless access can’t wake the car mid-job.
- Note your radio and clock settings, and have the right spanner, gloves and eye protection ready.
Disconnecting
- Switch the ignition off, close the windows, remove the key and step away so keyless access can’t wake the car.
- Wait about 4 minutes for the BSI control unit to power down before disconnecting.
- Disconnect the negative (−) terminal first, lift it clear, then the positive if you are removing the battery.
Working near airbags or pretensioners? Allow a couple of minutes after disconnecting before starting any work in that area.
Reconnecting and Re-initialising
- Reconnect positive first, then negative, and tighten both clamps firmly.
- Wait about 2 minutes, then start the car.
- Re-initialise the electric windows, and the sunroof if fitted — both lose their calibration.
- Re-enter the clock and any lost settings, and re-store your tyre pressures.
What You’ll Need to Reset Afterwards
Cutting the 12 V supply on the DS 7 clears several learned and stored settings. Expect to re-set the clock and radio presets, re-initialise the one-touch/anti-pinch windows and the panoramic sunroof so they auto-close again, and re-store your tyre-pressure reference. Seat and mirror memory positions may need re-doing, and one or two warning lights can appear briefly before clearing once the car has re-synchronised on a short drive.
If Something Isn’t Right Afterwards
- Windows or sunroof only move while held — run the relevant re-initialisation.
- Check both clamps are tight and fully seated — a loose terminal is a common cause of post-battery gremlins.
- Warning lights after reconnection often clear after a short drive; a persistent one stores a code (decode on autodtcs.com).
- If it cranks slowly or a light won’t clear, rule out a genuinely flat or tired battery rather than the disconnection.
- A new/different battery is best registered with PSA equipment for the smart-charging logic.
Frequently Asked Questions
Where is the battery on a DS 7 Crossback?
In the engine bay, under a cover you unclip — including on the E-Tense, where you service the 12 V battery, never the high-voltage system. It is a standard 12 V battery on all versions.
Why wait 4 minutes before disconnecting?
It lets the BSI body-control unit power down fully. Disconnecting while it is still awake can leave the electronics confused and throw up faults that are a nuisance to clear later.
Which terminal comes off first?
Negative (−) off first when disconnecting, and reconnect it last — positive goes on first. This order avoids shorting a live terminal against the bodywork while you work.
What needs resetting afterwards?
The electric windows and the sunroof (if fitted) re-initialise, plus the clock, radio presets and tyre-pressure reference. Seat and mirror memory can also drop, and a few warning lights may show briefly before clearing.
Do I need to code a new battery?
A new or different battery is best registered with PSA equipment so the smart-charging logic matches it. The car will run without that step, but registering helps the charging system look after the new battery.
Can I jump-start it instead of disconnecting?
Yes — if the battery is only flat, a jump-start or a mains charger keeps all your settings intact and avoids the re-initialisation. Disconnect only when renewing the battery or working near the airbags.
If a warning light stays on after reconnecting, look up the code on autodtcs.com.
Independent guide — not affiliated with DS. Always follow your official service manual and safety precautions. Read our full disclaimer.