1. Check for continuity between the No. 13 and No. 26 terminals of power tailgate control unit connector A (26P) and body ground.

Is there continuity?

YES | - | Repair a short in the RED/BLU (CLM+) or the BLK/RED (CLM−) wire, or faulty tailgate closer motor; replace the tailgate closer unit.■
NO | - | Repair a short in the RED/BLU (CLM+) or the BLK/RED (CLM−) wire between the power tailgate control unit and the tailgate closer unit.■

1. Disconnect the power tailgate control unit connector C (4P).