Hazard and Horn Reminder: Notes
WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
BCM output to IPDM E/R for horn reminder signal as DATA LINE (CAN H line and CAN L line). The hazard and horn reminder has C mode (horn chirp mode) and S mode (non-horn chirp mode).