Self-diagnostic Function (On-board diagnosis)
WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
By connecting the HDS to the data link connector (DLC), the HDS can retrieve the diagnostic information from the driver's MICU via a diagnostic line called the K-LINE The K-LINE is separate communication line from the CAN lines, but it is connected to most of the CAN related ECUs The driver's MICU is a gateway between the HDS and B-CAN related ECUs, and sends B-CAN diagnostic information to the HDS When doing a function test with the HDS, the HDS sends an output signal through the K-LINE to the driver's MICU The driver's MICU either relays the request to another ECU, or commands the function its self