These instructions apply to the DS 7 Crossback Mk1 (X74) 2017-Present. For other models, please choose your vehicle here.
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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 PSA “sleep” precaution before you touch the terminals. Here’s the safe sequence, including the E-Tense plug-in hybrid.
Before You Disconnect
The 12 V battery is in the engine bay. 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.
- 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, then the positive.
Working near airbags or pretensioners? Allow a couple of minutes after disconnecting before starting.
Reconnecting and Re-initialising
- Reconnect positive first, then negative.
- 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 lost settings.
If Something Isn’t Right Afterwards
- Windows or sunroof only move while held — run the relevant re-initialisation.
- Warning lights after reconnection often clear after a short drive; a persistent one stores a code (decode on autodtcs.com).
- 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 — including on the E-Tense, where you service the 12 V battery, never the high-voltage system.
Why wait 4 minutes before disconnecting?
It lets the BSI power down; disconnecting too soon can cause electronic faults.
Which terminal first?
Negative (−) off first, reconnect it last.
What needs resetting afterwards?
The electric windows and the sunroof (if fitted) re-initialise, plus the clock and settings.
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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