my BMW 3 Series F30/F31 (2012-2019) remote start won’t work, what should I check

BMW 3 Series F30/F31 (2012-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

558 words

Problem Statement

The remote start feature on a BMW 3 Series F30/F31 (2012-2019) is not functioning as expected, preventing the vehicle from starting remotely.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in park and the engine is off before performing any checks.

Symptoms

•Remote start button does not respond when pressed
•No engine crank or start attempt when using the remote
•Vehicle security lights flashing or illuminated
•Key fob battery low warning
•Check engine light illuminated on the dashboard
•Interior lights and accessories not activating with remote start

Diagnostic Steps

1
Check key fob battery**: Replace the battery in the key fob to ensure it has enough power.
2
Scan for error codes**: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the engine or immobilizer system.
3
Inspect remote start settings**: Verify that the remote start feature is enabled in the vehicle's settings or through the BMW app.
4
Test the key fob signal**: Ensure the key fob is sending a signal by checking if it unlocks the doors and operates other functions.
5
Examine the vehicle's security system**: Ensure the vehicle's security system is not preventing remote start due to a fault or tampering.
6
Check for aftermarket modifications**: Inspect for any aftermarket remote start systems that may interfere with factory functions.

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

•OBD-II scanner
•Small flathead screwdriver
•Multimeter
•Replacement key fob battery

Parts Required

•Key fob battery (CR2032 or as specified)

Related Faults

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Symptoms

•Remote start button does not respond when pressed

•No engine crank or start attempt when using the remote

•Vehicle security lights flashing or illuminated

•Key fob battery low warning

•Check engine light illuminated on the dashboard

•Interior lights and accessories not activating with remote start

Diagnostic Steps

1
Check key fob battery**: Replace the battery in the key fob to ensure it has enough power.
2
Scan for error codes**: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the engine or immobilizer system.
3
Inspect remote start settings**: Verify that the remote start feature is enabled in the vehicle's settings or through the BMW app.
4
Test the key fob signal**: Ensure the key fob is sending a signal by checking if it unlocks the doors and operates other functions.
5
Examine the vehicle's security system**: Ensure the vehicle's security system is not preventing remote start due to a fault or tampering.
6
Check for aftermarket modifications**: Inspect for any aftermarket remote start systems that may interfere with factory functions.

Solution

1. Preparation

Tools Required: OBD-II scanner, small flathead screwdriver, multimeter, replacement key fob battery.
Safety Warnings: Ensure the vehicle is in park and the engine is off before performing any checks.

2. Replace Key Fob Battery

Sub-steps:
1. Open the key fob using the small flathead screwdriver.
2. Remove the old battery and insert a new one, ensuring correct polarity.
3. Reassemble the key fob and test the remote start function.

3. Clear Error Codes

Sub-steps:
1. Connect the OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition to the "on" position without starting the engine.
3. Scan for DTCs and take note of any related to the remote start or immobilizer.
4. Clear any relevant codes and attempt to use the remote start again.

4. Verify Remote Start Settings

Sub-steps:
1. Access the vehicle’s settings through the iDrive system or BMW app.
2. Navigate to the remote start settings and ensure it is enabled.
3. Save any changes and attempt to use the remote start again.

5. Inspect Security System

Sub-steps:
1. Ensure all doors, trunk, and hood are properly closed.
2. Check for any fault indicators in the dashboard related to the security system.
3. If there are issues, consult the owner’s manual for troubleshooting security system issues.