STEP 1. Check of short to ground and open circuit in signal line between stop light switch connector and OSS-ECU connector
STEP 2. Check of short to ground and open circuit in signal line between stop light switch connector and ETACS-ECU connector
STEP 3. Using scan tool MB991958, check other system data list.
STEP 4. Using scan tool MB991958, check data list.
STEP 5. Check whether the DTC is reset.