It depends on the terms of the settlement. If the settlment agreement states that you are settling all claims arising out of the accident, then that would preclude you from pursuing a claim for injuries later. If the settlement agreement only states that you are settling property damage claims, but reserve the right to bring claims for personal injuries if such are later discovered, you would be able to do this. In the absence of a clear reservation of right to bring other claims later, most courts would likely conclude that in accepting payment, you did settle all claims.