Probable Causes
WARNING: This page is about a different variant/trim than selected.
- Wrong M.U.T.-III wiring harness
- The CAN bus line is defective.
- AWC-ECU power supply circuit malfunction
- Malfunction of AWC-ECU
- ECU malfunction of other system
- STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Check/repair the AWC-ECU power supply circuit.(Refer to INSPECTION PROCEDURE 3: AWC-ECU POWER SUPPLY CIRCUIT MALFUNCTION .)
NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING .)