STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
STEP 2. Using scan tool MB991958, check the DTC
STEP 3. Actuator test of combination meter
STEP 4. Check the ASC-ECU power supply circuit system.
STEP 5. Using scan tool MB991958, check the other system DTC
STEP 6. Using scan tool MB991958, check the other system DTC
STEP 7. Retest the system.
STEP 8. Retest the system.