DIAGNOSTIC FUNCTION
If the necessary data cannot be received from KOS-ECU via CAN during the certification communication with KOS-ECU, OSS-ECU sets the DTC B1139, and displays the immobilizer certification system inspection warning screen to the multi information display of the combination meter.
DIAGNOSIS
1. Using scan tool MB991958, diagnose the CAN bus line. (after turning the forced power supply output to "IG-ON" using the scan tool MB991958)
2. KOS diagnostic trouble code check (after turning the forced power supply output to "IG-ON" using the scan tool MB991958)
3. OSS-ECU DYC recheck