If you upgrade the radio in your 2009 to 2013 Acura TL or TSX and want to keep the climate information available, you will need to replace the factory navigation display with a non navigation display. When you replace the display you lose the factory backup camera. If you want to retain the factory backup camera and view it on your aftermarket radio you will need this harness. This harness provides the factory camera with the correct amount of voltage (8v) and gives you the reverse signal trigger wire (12v+) when in reverse. It also provides video via RCA out. On the TL all of these wires are on the same harness on the TSX you will get two connectors. If your factory camera has multiple angles only one angle will work with the new aftermarket radio and you will not be able to switch it.