What does -45 means on the dash board of 2008 honda pilot

SOURCE: 2008 honda pilot cabin air filter

This solution pertains to a 2008 Honda Pilot...To replace the cabin air filter which is located on the passenger side of the vehicle behind the glove box: Open glove box and remove stored items...while sitting in the passenger seat, pull towards you on each of the two clips on the left and right side of the glove box...this will cause them to become loose and the glove box will tip out completely exposing the inside of the dashboard. (Alternately...carefully pull towards you on the top center of the glove box which will cause the left and right side stops to pull away from the edges and allow the glove box to tip out) Here it gets tricky...the box holding the cartridge for the cabin air filter is the large black box on the left side behind the glove box The filter fits in a removable tray vertically inside that box. A pressure clip at the top of the box allows the vertical cover to be removed exposing the tray with the Cabin air filter... BUT!!! There is a plastic bar an inch or so high which has been placed there by the manufacturer to prevent most from changing the filter without the service department being involved. This bar must be cut with a sharp sheetrock knife or hacksaw and discarded, (it will not be reinstalled). Then there is a flat metal bar behind the plastic bar that can be removed using an 8mm socket and a phillips screwdriver. There are 2 8mm screws and one phillips head screw on each side that must be removed in order to remove the metal bar. THEN you can remove the cover to the cabin air filter box, pull out the tray with the filter (note how the filter is in the box so the new one can be placed the same way) reinsert the tray with the new filter and replace the tray cover. All other steps to finish the job are obvious as everything is the reverse. Actually the whole process is a lot of trouble and unless you are determined to change the filter I would recommend not doing it.