Partial brake assist and auto emergency braking failure to engage contributed to a rear end collision on February 12, 2022. Toyota contracted with an outside engineering firm to inspect brake system and their report did not address the lack of engagement of the auto emergency braking system part of Toyota Safety Sense 2.5 which the enabling switch does not activate. The Toyota Legal Claims department issued an incomplete report that they claim absolves the vehicle but after multiple attempts to reach the issuing department noone has addressed my questions or concerns. Therefore I consider this an incomplete and unresolved safety issue .