Repairing BMW CAS3+ Corrupted Data Using Autel IM508 / IM608

Repairing BMW CAS3+ Corrupted Data Using Autel IM508 / IM608

Requirements

• Autel IM508 or IM608 diagnostic tool
• XP400 Pro programmer (for IM508) or built-in XP400 (in IM608)
• Stable internet connection for server communication
• Compatible OBD and CAS module cables

Step-by-Step Repair Process

Step 1: Backup Existing Data

1. Connect the Autel IM508 / IM608 to the OBD-II port on your vehicle.
2. Power on the Autel device and select "Diagnostics" from the main menu.
3. Go to BMW > Control Unit > Body > CAS3+.
4. Backup Data:
   • In the CAS3+ menu, select “Read Backup Data” to store the current data.
   • Follow on-screen instructions to save this data.

Step 2: Remove and Access CAS Module (if required)

1. Disconnect the battery before accessing the CAS module.
2. Remove the CAS module from the vehicle.
3. Connect the CAS module to the Autel XP400 via the appropriate CAS cable.

Step 3: Upload Data to Autel Server

1. On the Autel main menu, go to “IMMO” (Immobilizer).
2. Select BMW from the brand menu and choose “CAS3+” under the vehicle options.
3. Choose “Data Processing” and then “Repair CAS”.
4. Upload the Backup Data:
   • Select “Upload to Server”. The tool will prompt you to confirm the backup file upload.
   • After uploading, wait for Autel’s server to process the data and send back a repair file.

Step 4: Download and Reinstall the Repaired File

1. When the repair file is ready, select “Download Repaired Data” in the same menu.
2. Write the Repaired Data:
   • Follow prompts to write the repaired data back to the CAS module.
   • The Autel device will guide you through the reinstallation.

Step 5: Verify and Finalize

1. Reinstall the CAS module in your vehicle, ensuring all connections are secure.
2. Reconnect the battery and turn the ignition to the ON position.
3. On the Autel device, select "Diagnostics" > "BMW" > "Control Unit" > "CAS3+".
4. Run a diagnostic scan to ensure the CAS module is functioning correctly and that there are no error codes.

Additional Notes

• If you encounter an error or the module fails to communicate, you may need to repeat the steps.
• In cases of total key loss, retrieve the ECU ISN and perform CAS synchronization.

http://blog.obdii365.com/2021/08/19/repair-bmw-cas3-istap-with-autel-im508-im608/