How to Repair BMW FEM/BDC Module with AUTEL IM508S?

 Here comes the user’s working experience on how repair BMW FEM/BDC module after programming failed with AUTEL IM508S.

“I worked on BMW X1 2017 BDC01. I pull FEM/BDC module out of car, connected it with godiag and started process as usual. After EEPROM successfully preprocessing, Autel started to program module to get SK but it wrote “Failed to program” and restored original EEPROM data back. After this, I put ECU back to car but it didnt start and ignition didnt wake up. So I tried to backup coding file but it didnt help. After little survey I tried to check software version (which I did also before I started programming) but Autel showed me “Software mismatch”. So I used ECU recovery process, choose original FEM/BDC data (backup done by reading ECU info) and it helped. So even I didnt program new key, I was able to repair ECU.”

 

For the future always read the EEPROM twice and compare it by seen first page and last page just simple tip if you keep using autel for BMW.

You can compare the two readings and see if they are exactly the same, Just to make sure that you get the same data.

How to Solve Autel IM508 BMW BDC Error Mismatch Versions Error?

 Problem:

Autel IM508S failed to add key BMW X2 with Godiag BDC/FEM test platform module.
usually does not have a problem before.
but now failed and can not program.
failed -> restore eeprom automatically -> shows mismatch versions.
can not read BCD with power, but first time read without power.
how can I repair BDC and add key again?

Solution:

When you chose Smart selection, Autel will automatically back up coding and original eeprom file. You can either put everything back in the car and restore or find the original eeprom file and restore. It can be very difficult to find the file though.
Also very important BDC has a different Eeprom chip. So make sure you read the right one.
Don’t panic just go manually. Go by system into fem key learning. Exit Smart mode, go by system- fem- key learning.

 

Updated:

We got it fixed manually through IMMO- BMW- By System- IMMO- FEM- Key operation- Key learning- preprocess learning.

Autel IM508S Program VW Golf NEC23C32 All Keys Lost with Godiag GT110

 This guide walks through bench key learning, a method where you program a key using just the instrument cluster and an Autel IM508S/IM608.

 

Step-by-Step Bench Key Programming

1. Set Up the GoDiag GT110 Simulator

• Connect the GoDiag GT110 to the instrument cluster (from a VW Polo 2009-2014).
• Plug in the 12V power supply to simulate the car’s electrical system.
• Use the DB15 cable to link the GoDiag to your IM508 tablet/PC.

2. Power On the Instrument Cluster

• Press the red ignition button on the GoDiag—this will light up the dashboard (simulating “key on”).
• The cluster should now be in diagnostic mode, ready for programming.

3. Connect the Autel IM508S

• Launch the Autel tool and select:
  • Manual Selection → Europe → VW Polo (2010-2014).
  • Choose Control Unit → Immobilizer.
  • Select NEC24C32 (the immobilizer type).

4. Enter PIN & CS Code

• If you have the PIN and CS code (extracted from the cluster’s EEPROM), enter them now.
• If not, you may need to read the EEPROM first.

5. Insert & Program the Transponder Chip

• Place the blank transponder chip into the GoDiag’s key slot.
• Select “Key Learning” in the Autel IM508S.
• The system will program the chip within 30 seconds.

6. Verify the Key

• Once programmed, the Autel will confirm “Key Learning Completed.”
• The new key should now start the car (once the cluster is reinstalled).

Autel IM508S VW Golf 2014 NEC24C32 All Keys Lost Service Mode

 Losing all keys to a Volkswagen Golf or Polo (2010-2014) can be a major inconvenience, but with the right tools and procedure, a dealer key can be created

 

Tools Required

• Autel IM508S or equivalent diagnostic tool (for immobilizer access)
• Blank VW key (transponder chip included)

 

Step-by-Step Procedure

1. Remove the Instrument Cluster

• The immobilizer data is stored in the instrument cluster, so it must be removed from the dashboard.
• Disconnect the wiring harness carefully to avoid damage.

2. Read the EEPROM Data

Extract the PIN code and CS code from eeprom data, which are essential for key programming.

Menu Path (in IM508S)

1. Manual Selection → Europe → VW Polo (2010-2014)
2. Select Control Unit-Immobilizer- Continental CAN Ins NEC+ 24C32 Immobilizer
3. Select Enter Service Mode with All Keys Lost (G-box) (this powers up the cluster for communication)
4. Follow the wiring diagram to connect Gbox with cluster. Connect the DB16 cable to the instrument cluster.
   Connect the IM508S with the OBDII femail connector of the G-box and connect a 12V power supply yo the DC12V terminal of the G-box
5. The tool will display the cluster type (e.g., Four Motors Speaker – Version 1).
6. Confirm and proceed to read the EEPROM data.

3. Extract PIN and CS Code

• Once the EEPROM is read, the tool will display:
  • PIN code (required for key programming)
  • CS code (security authentication)
  • Used/free key slots (e.g., Slot 1 & 2 used, others empty)

4. Generate a Dealer Key

• Select Make dealer key function.
• Insert a blank key into the programmer.
• Enter the CS code (extracted from the EEPROM dump) in the following format:

• The tool will confirm “Dealer key generated successfully.”

5. Reinstall the Instrument Cluster & Learn the Key

• Reconnect the instrument cluster to the vehicle.
• Turn the ignition ON with the new key.
• The immobilizer should recognize the key automatically (if not, use the IM508 to manually “learn” the key).

 http://www.key-programmer.org/2025/04/08/autel-im508s-program-vw-golf-polo-2014-nec24c32-all-keys-lost/

Autel XP400 Pro Not Connect to Programmer Solution

 If your Autel IM608 II/IM508S XP400 Pro is displaying a “Not Connected” warning, the problem might be simpler—and cheaper—to fix than you think. A common issue involves loose or broken internal contacts due to a flawed design. Here’s a step-by-step guide to diagnosing and repairing the problem yourself, potentially saving you hundreds of dollars.

 

The Problem: Loose or Broken Contacts

Many users have reported that the XP400’s connection port has a weak locking mechanism, causing the internal contacts to break or become loose over time. Symptoms include:

• Intermittent disconnections
• “XP400 Not Connected” errors
• Visible movement of the cable when plugged in

In some cases, the contacts on both sides of the connector may be damaged, requiring a simple but careful repair.

The Fix: DIY Solder Repair

Instead of spending $400+ on a replacement, you can attempt a solder repair:

What You’ll Need:

• Small Phillips screwdriver (to open the device)
• Soldering iron & solder
• Steady hands and patience

Steps:

1. Power Off & Disassemble
   • Turn off the XP400 and remove any connected cables.
   • Carefully open the device’s casing to access the internal components.
2. Inspect the Connection Port
   • Check for broken or loose solder joints near the port.
   • If the contacts are detached, they may need re-soldering.
3. Re-Solder the Contacts
   • Apply a small amount of solder to reattach any broken connections.
   • Ensure the joints are secure but avoid excessive heat to prevent damage.
4. Reassemble & Test
   • Put the device back together (you may choose to leave some non-essential parts off if they contribute to the issue).
   • Plug in the cable and check if the connection is stable.

After this quick fix, many users report their device functions normally again. While the design flaw may cause future issues, this repair can extend the life of your XP400 without the need for an expensive replacement.

Final Tips:

• Reinforce the port with epoxy or tape to prevent future movement.
• Handle the cable gently to avoid stressing the connection.
• Consider a protective case to minimize wear and tear.

By taking matters into your own hands, you can save $400+ and keep your Autel XP400 running smoothly.

 

Disclaimer: This repair involves opening your device, which may void the warranty. Proceed at your own risk. If unsure, consult a professional technician.