how to fix my BMW 3 Series E90/E91 (2005-2012) when the remote start is not working?

BMW 3 Series E90/E91 (2005-2012)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

582 words

Problem Statement

The remote start feature on a BMW 3 Series E90/E91 (2005-2012) is not functioning, preventing the vehicle from starting remotely.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shock.
•Ensure the vehicle is in a well-ventilated area when working with electrical components.
•Test the remote start feature after repairs to ensure it operates correctly.
•Scan for error codes again to confirm no new codes appear.
•Monitor the key fob's function to ensure locking and unlocking mechanisms work properly.
•Regularly check and replace the key fob battery every 1-2 years.
•Follow the manufacturer’s maintenance schedule for the vehicle's electrical system.
•Keep spare key fobs in good condition and periodically test their functionality.

Symptoms

•Remote key fob does not unlock or lock the doors
•No engine start when pressing the remote start button
•Dashboard indicators do not illuminate when attempting remote start
•Check engine light illuminated on the dashboard
•Battery in the key fob is dead or low
•Possible malfunction of the car's security system

Diagnostic Steps

1
Check the battery voltage of the key fob using a multimeter or replace the battery.
2
Scan the vehicle's onboard diagnostics system using an OBD-II scanner for any error codes.
3
Inspect the vehicle's fuses related to the remote start and central locking systems.
4
Verify that the vehicle is in park and that all doors are securely closed.
5
Test the remote start feature using a second key fob to rule out a faulty key fob.
6
Check the vehicle’s security system for any faults or malfunctions.

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
•Multimeter
•Small flathead screwdriver
•Fuse puller
•New key fob battery (CR2032)

Parts Required

•Replacement fuses (if necessary)
•New key fob battery (if applicable)

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Symptoms

•Remote key fob does not unlock or lock the doors

•No engine start when pressing the remote start button

•Dashboard indicators do not illuminate when attempting remote start

•Check engine light illuminated on the dashboard

•Battery in the key fob is dead or low

•Possible malfunction of the car's security system

Diagnostic Steps

1
Check the battery voltage of the key fob using a multimeter or replace the battery.
2
Scan the vehicle's onboard diagnostics system using an OBD-II scanner for any error codes.
3
Inspect the vehicle's fuses related to the remote start and central locking systems.
4
Verify that the vehicle is in park and that all doors are securely closed.
5
Test the remote start feature using a second key fob to rule out a faulty key fob.
6
Check the vehicle’s security system for any faults or malfunctions.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the car is parked in a safe, well-ventilated area.
Disconnect the battery to avoid electrical shock.

2. Key Fob Battery Replacement

Sub-steps:
1. Use a small flathead screwdriver to pry open the key fob casing.
2. Remove the old battery (typically a CR2032) and replace it with a new one, ensuring correct polarity.
3. Snap the key fob casing back together securely.

3. Fuse Inspection and Replacement

Sub-steps:
1. Locate the fuse box, which is typically found under the dashboard or in the engine compartment.
2. Refer to the vehicle’s manual to identify fuses related to remote start and central locking.
3. Remove the identified fuses using a fuse puller and inspect them visually for any signs of damage.
4. Replace any blown fuses with new ones of the same amperage rating.

4. Security System Check

Sub-steps:
1. Reconnect the battery and turn the ignition key to the "On" position without starting the engine.
2. Observe the dashboard for any security-related warning lights.
3. If the security light is illuminated, follow the vehicle's manual to reset the security system, which may involve turning the ignition on and off a specific number of times.

5. Testing Remote Start

Sub-steps:
1. Ensure all doors are closed and the vehicle is in park.
2. Press the remote start button on the key fob.
3. Observe if the engine starts; if not, repeat the diagnostic steps to identify if further repairs are necessary.

Tools Required:

OBD-II scanner
Multimeter
Small flathead screwdriver
Fuse puller
New key fob battery (CR2032)

Parts Required:

Replacement fuses (if necessary)
New key fob battery (if applicable)

Estimated Repair Time: 1-2 hours

Safety Warnings:

Disconnect battery before working on electrical systems to prevent shock.
Ensure the vehicle is in a well-ventilated area when working with electrical components.