Power tailgate control unit has the self-diagnosis function that can detect failure without HDS.

- If the power tailgate system has a failure, the system will initiate fail-safe mode, and ignition switch turned ON (II), the power tailgate indicator will start to blink.
- In case the ignition switch is turned ON (II) again, if the tailgate system detects the same reoccurring failure, the system will initiate fail-safe mode and the power tailgate indicator will come on (no blinking).