Problem: When reading BMW CAS data with the Autel MaxiIM IM608 II, one user encounters this error: “Communication error of the programmer. Please check the programmer connection.”
Engineer’s Answer: Check the communication between IM608 II and XP400 Pro, update both firmware versions, and inspect the APA109 wiring harness connections and CAS power supply.
Solution
Check XP400 Pro Communication
- Confirm that the XP400 Pro communicates normally with the IM608 II.
- Check whether the green indicator stays on and whether the programmer can read the key normally.
- Update the IM608 II and XP400 Pro firmware to the latest versions.
Check CAS Wiring and Power Supply
- Check the APA109 wiring harness connections to the CAS module and verify the power supply.
- In the reported case, the XP400 Pro + APA109 setup showed 0V when reading CAS data, indicating that the programmer was not detecting the CAS module’s power supply.
- Prioritize checking the APA109 wiring harness connections and power supply.
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