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

BMW 5 Series G30/G31 (2017-2024)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

474 words

Problem Statement

The key fob for the BMW 5 Series G30/G31 (2017-2024) is not functioning, preventing the operation of the vehicle's locking, unlocking, and starting features.

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a safe location before attempting repairs.

Symptoms

•Key fob buttons unresponsive
•Vehicle does not recognize the key fob
•"Key not detected" warning displayed on the dashboard
•Inability to start the engine using the key fob
•Battery in the key fob appears to be new but still non-functional

Diagnostic Steps

1
Inspect the key fob for physical damage or signs of wear.
2
Check the battery in the key fob for proper installation and voltage.
3
Test the key fob with a multimeter to ensure it is transmitting a signal.
4
Attempt to reset the key fob by following the vehicle owner's manual instructions.
5
Verify the car's receiver is functioning by using a second key fob if available.

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

•Ensure that the vehicle is turned off and parked in a safe location.

Parts Required

•CR2450 key fob battery

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Diagnostic Steps

1
Inspect the key fob for physical damage or signs of wear.
2
Check the battery in the key fob for proper installation and voltage.
3
Test the key fob with a multimeter to ensure it is transmitting a signal.
4
Attempt to reset the key fob by following the vehicle owner's manual instructions.
5
Verify the car's receiver is functioning by using a second key fob if available.

Solution

1. Preparation

Tools Required: Small flathead screwdriver, new key fob battery (CR2450), multimeter
Ensure that the vehicle is turned off and parked in a safe location.

2. Replace Key Fob Battery

Open the Key Fob:
- Use a small flathead screwdriver to gently pry open the key fob casing.
- Be careful not to damage the casing or internal components.
Remove the Old Battery:
- Take note of the battery orientation (positive and negative sides).
- Carefully lift out the old battery using the screwdriver.
Install the New Battery:
- Insert the new CR2450 battery into the key fob, ensuring correct orientation.
- Press down until the battery is securely in place.
Reassemble the Key Fob:
- Align the casing halves and press them together until they snap back into place.

3. Reprogram the Key Fob (if necessary)

Enter the Vehicle:
- Sit in the driver’s seat with the new battery installed key fob.
Turn on the Ignition:
- Insert the key fob into the ignition slot (if applicable) or press the start button without pressing the brake pedal.
Reprogram the Key:
- Follow the specific reprogramming steps in the owner's manual, usually involving pressing the lock button and following prompts.