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Key Fob Not Detected - 2017 Mini Cooper Hardtop

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Mike T. · rep 0 · May 25, 4:58 AM · 1 replies · solved · Question

Vehicle: 2017 Mini Cooper Hardtop

Hello everyone,

I'm having a really frustrating issue with my 2017 Mini Cooper Hardtop. For the past few days, I keep getting a 'Key Fob Not Detected' message when I try to start the car. Sometimes it works after a few tries, but other times I'm just stuck.

I've already replaced the battery in the key fob with a brand new one, thinking that was the obvious fix, but the problem persists. The car won't even try to crank. Is there some kind of antenna or sensor in the car that reads the fob that might be failing? This is making me nervous about getting stranded.

Any ideas on what else could be causing this electrical headache?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:58 AM

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ClearTheCode admin answer:

Experiencing a 'Key Fob Not Detected' message in your 2017 Mini Cooper Hardtop, especially after replacing the fob battery, points to a potential issue with the vehicle's immobilizer system or the key's communication with the car. This is a critical electrical system for starting your Mini.

Here’s a breakdown of common causes and diagnostic steps:

  1. Key Fob Itself: Even with a new battery, the fob itself could be faulty. Try using a spare key fob if you have one. If the spare works consistently, your primary fob likely needs replacement or repair.
  2. Immobilizer Antenna Ring: Mini Coopers have an antenna ring, often located around the ignition switch or steering column, that reads the signal from the key fob. If this antenna or its wiring is damaged or malfunctioning, the car won't detect the key. This is a common failure point for 'key not detected' issues.
  3. CAS (Car Access System) Module: The CAS module is the central control unit for the immobilizer, key recognition, and starting functions. A fault within this module, or its communication with other modules, can prevent the car from recognizing the key. This could be due to internal electronic failure or even a software glitch.
  4. Wiring Issues: Check for any signs of damaged wiring leading to the antenna ring or the CAS module. Rodent damage or corrosion in connectors can interrupt the signal.
  5. Interference: While less common, strong electromagnetic interference from external sources (e.g., power lines, other electronic devices) can sometimes temporarily block the key fob signal.

When to See a Shop: If trying a spare key fob doesn't resolve the issue, you should take your Mini to a dealership or a specialized independent shop. They have diagnostic tools (like ISTA/D) that can read specific fault codes from the CAS module, identify if the antenna ring is faulty, or if the key fob needs to be reprogrammed or replaced. This system is complex, and DIY repairs beyond battery replacement are generally not recommended due to the security implications.

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