Disconnect and Reconnect the Battery

Reviewed by the Service Reset editor · Updated August 9, 2026 · How we verify
Quick referenceTools10 mm spannerTime~15 minMethodDisconnect negative terminal first

These instructions apply to the Jeep Compass Mk2 (MP) 2017-Present.
For other models, please choose your vehicle here.

Disconnecting the 12 V battery on your Jeep Compass (MP, 2017–present) — to fit a new one, store the car, or work safely near the airbags — takes a couple of precautions, and afterwards several convenience systems need re-initialising. Here’s the safe sequence.

Jeep Compass Mk2 — the vehicle covered in this guide.
Jeep Compass Mk2. Photo by User 3204 via Wikimedia Commons, licensed CC BY-SA 4.0.

Before You Disconnect

The Compass’s 12 V battery is in the engine bay. On the 4xe plug-in hybrid this 12 V battery is still the one you service — never touch the orange high-voltage cabling or the traction battery.

  1. Switch the ignition off and note your radio presets and personal settings.
  2. Ensure all electrical consumers are switched off.
  3. Wait 1 minute after switching off before disconnecting.
  4. Disconnect the negative (−) terminal first, then the positive.

Working near airbags or seat-belt pretensioners? Wait 2 minutes after disconnecting before starting work.

Reconnecting and Re-initialising

Reconnect positive first, then negative. With the ignition off and the driver’s door closed, re-initialise the systems the Compass has lost:

  • Power windows (one-touch).
  • Electric sunroof, if fitted.
  • Power tailgate, if fitted.

The clock, radio presets and some settings will also need re-entering.

If Something Isn’t Right Afterwards

  • Windows or sunroof only move while held — that’s the lost calibration; run the re-initialisation.
  • Warning lights after reconnection often clear after a short drive; a persistent one stores a code (decode on autodtcs.com).
  • Fit a like-for-like battery (type and capacity) so the stop/start charging logic works.

Frequently Asked Questions

Where is the battery on a Jeep Compass?

In the engine bay — including on the 4xe, where you still service the 12 V battery, never the high-voltage system.

Which terminal comes off first?

The negative (−) first, and reconnect it last.

What needs resetting after reconnecting?

Windows, sunroof and power tailgate re-initialise, plus the clock and presets.

How long should I wait before disconnecting?

One minute after switch-off; two minutes if working on airbags or pretensioners.

If a warning light stays on after reconnecting, look up the code on autodtcs.com.

Independent guide — not affiliated with Jeep. Always follow your official service manual and safety precautions. Read our full disclaimer.

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