✅️ BMW E61 Remote Control Not working FIX Wiring Problem Diversity Module

If your BMW E61's remote control isn't working, and you suspect a wiring problem related to the diversity antenna module, you're narrowing in on a common issue for these vehicles. The diversity antenna module services the car's remote central locking system, and failures can lead to the remote key fob not working properly.

Understanding the Problem
The diversity antenna module in BMW models like the E61 is typically located in the rear of the vehicle, often integrated into the rear window or situated near it. This module is responsible for receiving signals from your remote key fob. When there's a fault in the wiring or the module itself malfunctions, it can prevent the key fob from unlocking or locking the doors, affecting the comfort access system and potentially other remote functions.

Common Symptoms
Key fob fails to lock/unlock the vehicle.
Reduced range of key fob.
Comfort access system becomes inconsistent or non-functional.

Diagnostic Steps

1. *Check the Key Fob Battery:* Before heading into more complex diagnostics, ensure the key fob battery isn't the issue. Replace the battery if necessary and test the remote again.

2. *Visual Inspection:* Inspect the wiring leading to and from the diversity antenna module for any signs of wear, damage, or corrosion. Pay particular attention to any spots where the wire could be pinched or has rubbed against sharp edges, leading to insulation damage and potential shorts or breaks in the wire.

3. *Check the Diversity Antenna Module:* Locate the diversity antenna module (often in the rear of the vehicle, sometimes integrated into the spoiler or upper part of the rear hatch). Look for any signs of water intrusion, corrosion, or physical damage to the module itself. Water damage is a common issue, especially in models where the module is located near areas prone to moisture accumulation.

4. *Electrical Connections and Continuity Test:* Check the electrical connections to the diversity module for cleanliness and security. Use a multimeter to test the continuity of the wiring between the module and the vehicle's electrical system. Ensure there are no open circuits or shorts.

5. *Signal Test:* If you have access to diagnostic tools that can read the signal strength from the key fob at the diversity module, conduct this test to verify that the module is receiving the signal from the remote. Weak or no signal reception could point to a module fault.

6. *Software/Firmware Update:* In some cases, software issues can lead to malfunction. Check if there are any recommended updates for the vehicle’s electrical system that address known issues with the diversity module.

7. *Professional Diagnosis:* If the above steps do not resolve the issue, consider getting a professional diagnosis. A BMW specialist or a dealer will have the specialized tools and software to more accurately diagnose the problem, including the ability to check for software issues and internal module failures.

Repair and Replacement
If a fault is found with the diversity antenna module or the wiring, repair or replacement will be necessary. Given the complex nature of modern automotive electronics, and especially in vehicles like BMWs, professional service is often recommended. Water damage or corrosion to the module will typically require replacing the module, while wiring issues may be repairable.

Keep in mind, after the replacement of significant components like the diversity module, programming or coding to the vehicle may be required, further emphasizing the need for professional assistance.