my BMW 5 Series G30/G31 (2017-2024) remote start is not working, what can I do?

BMW 5 Series G30/G31 (2017-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

493 words

Problem Statement

The remote start feature on a BMW 5 Series G30/G31 (2017-2024) is not functioning properly.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is in park with the engine off before inspecting components.
•Test the remote start function again to ensure it operates correctly.
•Check for any new error codes using the OBD-II scanner.
•Monitor the vehicle's dashboard for any warnings or messages.
•Regularly check and replace key fob batteries as needed.
•Maintain the vehicle battery in good condition by checking voltage periodically.
•Follow the manufacturer's recommended maintenance schedule for the remote start system.

Symptoms

•Remote start button on the key fob does not respond
•Engine fails to start remotely
•No feedback from vehicle such as lights flashing or horn sounding
•Check control message displayed on the dashboard
•Battery warning light illuminated

Diagnostic Steps

1
Verify that the key fob battery is charged and functioning.
2
Check if the vehicle is in an environment that supports remote start (e.g., doors closed, hood closed).
3
Scan the vehicle’s onboard diagnostics (OBD-II) for any fault codes related to the remote start system.
4
Inspect the battery voltage; ensure it is above the threshold required for remote start functionality.
5
Test the remote start feature using a different key fob if available.
6
Review the vehicle manual for specific remote start conditions and limitations.

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

•Flathead screwdriver
•Multimeter
•BMW diagnostic tool (e.g., ISTA, INPA)

Parts Required

•CR2450 battery (for key fob)
•Vehicle battery (if replacement is needed)

Related Faults

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Diagnostic Steps

1
Verify that the key fob battery is charged and functioning.
2
Check if the vehicle is in an environment that supports remote start (e.g., doors closed, hood closed).
3
Scan the vehicle’s onboard diagnostics (OBD-II) for any fault codes related to the remote start system.
4
Inspect the battery voltage; ensure it is above the threshold required for remote start functionality.
5
Test the remote start feature using a different key fob if available.
6
Review the vehicle manual for specific remote start conditions and limitations.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked in a safe location.
Disconnect the battery if instructed during repairs.

2. Replace Key Fob Battery

Sub-steps:
1. Use a small flathead screwdriver to carefully pry open the key fob.
2. Remove the old battery and replace it with a new CR2450 battery, ensuring the polarity is correct.
3. Snap the key fob back together securely.

3. Check Vehicle Battery Voltage

Sub-steps:
1. Use a multimeter to measure the vehicle's battery voltage.
2. Ensure the voltage is at least 12.4 volts; if not, charge the battery or replace it if necessary.
3. Reconnect the battery if it was disconnected.

4. Inspect and Reset Remote Start Module

Sub-steps:
1. Locate the remote start module (usually found near the fuse box).
2. Disconnect the module and inspect for any visible damage or loose connections.
3. Reconnect the module and perform a system reset by following the manufacturer’s instructions.

5. Update Vehicle Software

Sub-steps:
1. Connect a BMW diagnostic tool to the OBD-II port.
2. Check for any software updates for the vehicle's control units.
3. Follow the diagnostic tool’s prompts to update the system if necessary.

Tools Required:

Flathead screwdriver
Multimeter
BMW diagnostic tool (e.g., ISTA, INPA)

Parts Required:

CR2450 battery (for key fob)
Vehicle battery (if replacement is needed)

Estimated Repair Time: 1-2 hours

Safety Warnings:

Disconnect the battery before working on electrical systems.
Ensure the vehicle is in park with the engine off before inspecting components.