how to fix my BMW 3 Series F30/F31 that won’t remote start

BMW 3 Series F30/F31 (2012-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

571 words

Problem Statement

The BMW 3 Series F30/F31 is experiencing an issue where the remote start function is not engaging.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shorts.
•Ensure the vehicle is in a well-ventilated area when testing remote start functionality.

Symptoms

•Remote start button does not respond when pressed
•Key fob battery is not low (confirmed)
•No dashboard lights or indications when attempting remote start
•Engine does not crank or start
•No error messages displayed on the dashboard

Diagnostic Steps

1
Check the key fob for proper functionality using a spare key if available.
2
Scan the vehicle's OBD-II system for error codes related to the remote start or engine management system.
3
Inspect the battery voltage and connections to ensure the vehicle battery is fully charged and connections are secure.
4
Verify that all doors, the trunk, and the hood are closed securely, as remote start may not activate if any are ajar.
5
Ensure that the engine immobilizer system is functioning properly and not preventing start conditions.
6
Check for any blown fuses in the fuse box related to the remote start feature.

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

•Sub-steps:**
•Test the spare key fob to see if it can initiate the remote start.
•If the spare key works, replace the battery in the original key fob.
•If both key fobs fail, proceed to the next steps.

Parts Required

•Key fob battery (if original is low)
•Replacement fuses (if any are blown)

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Diagnostic Steps

1
Check the key fob for proper functionality using a spare key if available.
2
Scan the vehicle's OBD-II system for error codes related to the remote start or engine management system.
3
Inspect the battery voltage and connections to ensure the vehicle battery is fully charged and connections are secure.
4
Verify that all doors, the trunk, and the hood are closed securely, as remote start may not activate if any are ajar.
5
Ensure that the engine immobilizer system is functioning properly and not preventing start conditions.
6
Check for any blown fuses in the fuse box related to the remote start feature.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked in a safe area and the engine is off.
Disconnect the negative terminal of the battery for safety.

2. Check Key Fob Functionality

Tools Required: None
Sub-steps:
- Test the spare key fob to see if it can initiate the remote start.
- If the spare key works, replace the battery in the original key fob.
- If both key fobs fail, proceed to the next steps.

3. Inspect Vehicle Battery

Tools Required: Multimeter
Sub-steps:
- Use a multimeter to measure the battery voltage; it should be around 12.6 volts or higher.
- Clean any corrosion from the battery terminals and ensure they are tightly secured.
- If the battery voltage is low, charge or replace the battery.

4. Verify Security Systems

Tools Required: None
Sub-steps:
- Check that all doors, the trunk, and the hood are securely closed.
- If any door is open, close it and attempt the remote start again.

5. Inspect Fuses

Tools Required: Fuse puller or needle-nose pliers
Sub-steps:
- Locate the fuse box and identify the fuses related to the remote start (refer to the owner's manual).
- Remove and inspect the fuses for any signs of being blown.
- Replace any blown fuses with the same amperage rating.

6. Reconnect Battery

Tools Required: None
Sub-steps:
- Reconnect the negative terminal of the battery.
- Test the remote start function again to see if the issue is resolved.