how to fix the remote start not working on 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

4 min read

623 words

Problem Statement

The remote start feature on a BMW 3 Series E90/E91 (2005-2012) is not functioning, which may be due to various electrical or programming issues.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to prevent shock or damage.
•Ensure vehicle is in park or neutral when performing remote start functions.

Symptoms

•Remote start button does not respond when pressed
•Engine does not crank or start
•Key fob battery may be weak or dead
•No indicator lights or sounds when attempting to start remotely
•Check engine light illuminated (if related to remote start system)
•Other electronic features (e.g., locks, trunk) may not respond

Diagnostic Steps

1
Check the battery condition of the key fob using a multimeter or replace it if necessary.
2
Scan the vehicle’s onboard diagnostics (OBD-II) for any error codes related to the starting system.
3
Inspect the remote start module and wiring for visible damage or loose connections.
4
Verify that the vehicle is in 'Park' or 'Neutral' and that all doors are closed before attempting to start.
5
Test the remote start function with a spare key fob (if available) to rule out key fob issues.
6
Check the vehicle's fuses related to the remote start and related electrical systems.

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

•Disconnect the negative battery terminal to ensure safety while working on electrical systems.

Parts Required

•Key fob battery (CR2032 or equivalent)
•Fuses (if blown)

Related Faults

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Symptoms

•Remote start button does not respond when pressed

•Engine does not crank or start

•Key fob battery may be weak or dead

•No indicator lights or sounds when attempting to start remotely

•Check engine light illuminated (if related to remote start system)

•Other electronic features (e.g., locks, trunk) may not respond

Diagnostic Steps

1
Check the battery condition of the key fob using a multimeter or replace it if necessary.
2
Scan the vehicle’s onboard diagnostics (OBD-II) for any error codes related to the starting system.
3
Inspect the remote start module and wiring for visible damage or loose connections.
4
Verify that the vehicle is in 'Park' or 'Neutral' and that all doors are closed before attempting to start.
5
Test the remote start function with a spare key fob (if available) to rule out key fob issues.
6
Check the vehicle's fuses related to the remote start and related electrical systems.

Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, flathead screwdriver, Phillips screwdriver, wire strippers, electrical tape.
Disconnect the negative battery terminal to ensure safety while working on electrical systems.

2. Replace Key Fob Battery

Open the key fob using a flathead screwdriver, taking care not to damage the casing.
Remove the old battery and replace it with a new battery (CR2032 or equivalent).
Reassemble the key fob and test the remote start function.

3. Inspect Remote Start Module

Using a socket set, remove any panels covering the remote start module (location may vary based on installation).
Visually inspect the module for any signs of damage or corrosion.
Ensure all wiring is securely connected and not frayed. Repair any damaged wires with electrical tape or replace them as needed.

4. Check and Replace Fuses

Locate the fuse box (typically under the dashboard or in the engine bay).
Identify the fuses related to the remote start system using the fuse diagram.
Remove and inspect each fuse for continuity using a multimeter. Replace any blown fuses with the correct amperage rating.

5. Reprogram Remote Start (if applicable)

Follow the manufacturer's instructions for reprogramming the remote start system. This may involve using the key in the ignition and pressing specific buttons on the fob.
Consult the vehicle’s manual or a service guide for precise reprogramming steps.

6. Reconnect Battery and Test

Reconnect the negative battery terminal.
Test the remote start function to verify it is now operational.