how to fix key fob not working for my BMW 5 Series G30/G31 (2017-2024)?

BMW 5 Series G30/G31 (2017-2024)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

473 words

Problem Statement

The key fob for a BMW 5 Series G30/G31 (2017-2024) is not functioning, resulting in the inability to lock/unlock the vehicle or start the ignition.

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in the "Off" position when working on the key fob to avoid accidental starting or locking.

Symptoms

•Key fob buttons are unresponsive
•Vehicle does not recognize key fob
•Unable to start the engine
•LED indicator on fob does not light up
•Key fob battery warning on dashboard (if applicable)

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Check the battery level of the key fob using a multimeter.
3
Replace the key fob battery if necessary.
4
Attempt to reprogram the key fob using the vehicle's onboard settings.
5
Scan the vehicle’s onboard computer for any fault codes related to the keyless entry system.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Small flathead screwdriver
•Multimeter
•CR2032 battery (or applicable battery type)

Parts Required

•CR2032 battery (or applicable battery type)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the key fob for physical damage or wear.
2
Check the battery level of the key fob using a multimeter.
3
Replace the key fob battery if necessary.
4
Attempt to reprogram the key fob using the vehicle's onboard settings.
5
Scan the vehicle’s onboard computer for any fault codes related to the keyless entry system.

Solution

1. Preparation

Gather tools: small flathead screwdriver, CR2032 battery (or applicable battery type), and a multimeter.
Ensure the vehicle is in a safe, stationary position.

2. Open Key Fob

Use the small flathead screwdriver to gently pry open the key fob casing.
Take care not to damage the casing or internal components.

3. Replace Battery

Remove the old battery from the key fob.
Clean the battery contacts gently with a cotton swab if corroded.
Insert the new CR2032 battery (or applicable) ensuring the correct polarity (+/-).

4. Reassemble Key Fob

Align the two halves of the key fob and press them together until they click securely.
Ensure no gaps are visible; the fob should feel solid.

5. Reprogram Key Fob (if necessary)

Sit in the driver’s seat with all doors closed and locked.
Insert the key fob into the ignition slot.
Turn the key to the "On" position without starting the engine and back to "Off" five times within ten seconds.
The vehicle will indicate successful programming with a chime or light flash.

6. Test Key Fob

After reprogramming, test all buttons to ensure proper functionality.
Attempt to lock/unlock the doors and start the engine.