Check your LVB when some CSPs that take longer to upgrade are run the 12v battery gets drained... yes the should be putting a charger on it when doing the CSP but if your battery can't hold it SOC then weired things start happening.. everything sort of goes into "limp" mode... I could see that "half" the horn would play...lol my auto door locks would work for the driver but not for any other door, my internal chimes didn't go through the sound system, mistress wouldn't acknowledge me when I walked up to her (she really developed an attitude)... I have found that almost everything that ends up not working from OTA updates to the smallest thing often revolves around the LVB or resetting the system by same...Has anyone else had the sound of their horn change after having the CSP service for the front sensors done?