how to troubleshoot the remote start not working on my BMW 3 Series G20/G21 (2019-2024)

BMW 3 Series G20/G21 (2019-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

564 words

Problem Statement

The remote start feature on a BMW 3 Series G20/G21 (2019-2024) is not functioning, preventing the engine from starting remotely.

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent short circuits.

Symptoms

•Remote start button does not respond when pressed
•No engine start or ignition sounds
•Dashboard lights do not illuminate with remote start attempt
•"Remote start unavailable" message displayed on the infotainment screen
•Key fob battery low or dead warning

Diagnostic Steps

1
Check the key fob battery level and replace it if low or dead.
2
Ensure that the vehicle is within the range of the remote start signal.
3
Verify that all doors, hood, and trunk are securely closed.
4
Scan for error codes using an OBD-II scanner to check for any related diagnostic trouble codes (DTCs).
5
Confirm that the vehicle is not in a restricted state (e.g., parked in gear, not in "Run" mode).
6
Check the remote start settings in the vehicle’s infotainment system to ensure the feature is enabled.

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

•Inspect the key fob for physical damage or wear.
•Ensure the vehicle is parked on flat ground and is in "Park" mode.

Parts Required

•Key fob battery (CR2032 or as specified)

Related Faults

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Diagnostic Steps

1
Check the key fob battery level and replace it if low or dead.
2
Ensure that the vehicle is within the range of the remote start signal.
3
Verify that all doors, hood, and trunk are securely closed.
4
Scan for error codes using an OBD-II scanner to check for any related diagnostic trouble codes (DTCs).
5
Confirm that the vehicle is not in a restricted state (e.g., parked in gear, not in "Run" mode).
6
Check the remote start settings in the vehicle’s infotainment system to ensure the feature is enabled.

Solution

1. Preparation

Tools Required: OBD-II scanner, flathead screwdriver, Phillips screwdriver, multimeter
Inspect the key fob for physical damage or wear.
Ensure the vehicle is parked on flat ground and is in "Park" mode.

2. Replace Key Fob Battery

Sub-steps:
1. Use a flathead screwdriver to gently pry open the key fob casing.
2. Remove the old battery and note the battery type (usually CR2032).
3. Insert a new battery in the correct orientation (check for + and - symbols).
4. Reassemble the key fob casing and test the remote start function.

3. Reset Remote Start Feature

Sub-steps:
1. Turn the ignition to the "On" position without starting the engine.
2. Navigate to the "Settings" menu on the infotainment screen.
3. Select "Vehicle Settings" and then "Remote Start."
4. Toggle the remote start feature off and then back on.
5. Turn off the ignition and attempt to use the remote start again.

4. Inspect and Repair Wiring Connections

Sub-steps:
1. Open the hood and visually inspect the wiring harnesses related to the remote start system for damage or disconnection.
2. Use a multimeter to check for continuity in the wiring.
3. Repair any broken wires or connections as needed.

5. Clear Error Codes

Sub-steps:
1. Connect the OBD-II scanner to the vehicle's diagnostic port.
2. Scan for error codes and note any related to the remote start system.
3. Clear the error codes and attempt to use the remote start again to see if the issue persists.