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Do you have the vehicle identification number so that I can check a few things? I thought there was a technical service bulletin or possibly recall on that rear window shade. Does the shade work in any direction if you give it a little assistance will it start to work?
Just to clarify you are saying that the grinding noise only occurs from the shade when it tries to go down automatically when you go into reverse? The grinding noise coming from the shade? Again just to clarify using the switch putting the shade up or down you hear no noise coming from the shade?
If the grinding noises coming from the motor area what you're going to find is the assembly will have to be replaced. Whenever you go into reverse a signal is sent back to the system and if the shade is in the up position it will try and retract it. If by giving it some assistance down it continues to the down without any for the noise or sticking then this will confirm that the shade retractor motor simply will have to be replaced. I have replaced several of them due to sticking and not retracking and for making noise. I checked the vehicle identification number there are no customer support programs or extended warranties or recalls on this particular vehicle.