Warning Chimes And Chime Characteristics

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

The IPC uses multiple network messages to control the overall warning chime arbitrator. The IPC arbitrates and controls all chimes regardless if they are sounded through the audio system or the IPC. The warning chimes all sound through the audio system except for the turn signal tick-tock chime, which is sounded through the IPC. In the event of an audio system fault, the IPC sounds all chimes. The audio system has the ability to sound up to 2 chimes at a time while the IPC can only sound a single chime at a time.

The warning chimes use volume, chime frequency, length of time the chime sounds, length of off time between chime tones, decay of the chime tone and the number of chime tones to identify which chime is sounding. Most warning chimes have unique characteristics, however, there are chimes that do sound the same. The chime characteristics are defined by the different chime types:

Information
Soft-warning
Hard-warning
Tick-tock (on-off)

The IPC receives the engine rpm data from the PCM and all door, hood and liftgate ajar status, accessory delay and ignition status messages from the BCM over the HS-CAN1. The IPC receives the audio chime status message from the ACM over the HS-CAN3.

The IPC sends the IPC chime request, chime source, chime power up and chime controls messages to the DSP module to control the chimes.