carefully remove the rear seat & rear decking. one helix shaped ducting of yellow color with a high voltage warning over the batter cooling fan must be missing. Function of the duct is to keep air flow in battery bank. If it is missing - means your car rear end is locally repaired & painted after arrival in Pakistan. The USTAD considered the shield fazol chez after repair & painting.
The people on rear seat must be feeling 'HEAT' on their rear 'END' in your Prius
another Prius user on forum can be of your help he is also from lahore