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

BMW 3 Series E90/E91 (2005-2012)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

509 words

Problem Statement

The remote start feature is not functioning on a BMW 3 Series E90/E91 (2005-2012).

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before handling electrical components.
•Ensure the vehicle is in a safe location while testing remote start functionality.

Symptoms

•Remote start does not activate when button is pressed.
•Key fob battery may be weak or dead.
•No response from the vehicle when attempting remote start.
•Possible dashboard warning lights illuminated.
•Engine does not crank or start.

Diagnostic Steps

1
Check the key fob battery level and replace if necessary.
2
Inspect the vehicle's battery for proper charge and connections.
3
Confirm the remote start feature is enabled in the vehicle's settings.
4
Use an OBD-II scanner to check for any stored error codes related to the starting system.
5
Verify that all doors are closed and locked, as many remote start systems require this for activation.
6
Test the key fob for proper signal transmission by observing LED response when buttons are pressed.

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

•Use the flathead screwdriver to gently pry open the key fob casing.
•Remove the old battery and insert the new CR2032 battery, ensuring correct polarity.
•Snap the key fob back together securely.

Parts Required

•Key fob battery (CR2032)
•Vehicle battery (if necessary)

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Diagnostic Steps

1
Check the key fob battery level and replace if necessary.
2
Inspect the vehicle's battery for proper charge and connections.
3
Confirm the remote start feature is enabled in the vehicle's settings.
4
Use an OBD-II scanner to check for any stored error codes related to the starting system.
5
Verify that all doors are closed and locked, as many remote start systems require this for activation.
6
Test the key fob for proper signal transmission by observing LED response when buttons are pressed.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the vehicle battery to ensure safety while working on electrical components.
Ensure the vehicle is in a well-ventilated area.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, new battery (CR2032).
Use the flathead screwdriver to gently pry open the key fob casing.
Remove the old battery and insert the new CR2032 battery, ensuring correct polarity.
Snap the key fob back together securely.

3. Inspect Vehicle Battery

Tools Required: Multimeter.
Connect the multimeter to the vehicle battery terminals to check the voltage; it should read around 12.6 volts or more.
If the voltage is low, charge or replace the vehicle battery as needed.

4. Check Remote Start Settings

Reconnect the vehicle battery.
Start the vehicle normally and access the settings via the dashboard.
Navigate to the remote start feature and ensure it is enabled.

5. Reset the System

Tools Required: OBD-II scanner.
Connect the OBD-II scanner to the vehicle's diagnostic port.
Clear any error codes and reset the vehicle’s computer if necessary.

6. Test Remote Start Functionality

With the vehicle prepared, press the remote start button on the key fob.
Ensure that all doors are locked and the vehicle is in a secure position to test functionality.