Teardown: The BMW / Harman IDC23H Infotainment Unit (B423)

Summary

The IDC23H is one of the newest infotainment units from BMW, as of January 2026. The design is based on the previous-generation MGU22/MGU22H, and is used in a wide variety of BMW models - this unit in particular was found in one of BMW’s newest X1 U11 SUVs.While previous generations of BMW infotainment unit were primarily developed by Harman Becker themselves, this unit appears to be a joint venture between both Harman Becker and Garmin - similar to the MGU22 units.The design is sold under two different names:This naming scheme was the same in the prior MGU22 lineup, where the MGU22 was produced by Garmin, and the MGU22H was produced by Harman. Essentially, it seems that ‘H’ at the end of the model name = Harman.As for connectivity, this unit provides the following:APIX connectivity to the Driver Camera System (DCS)APIX connectivity to the Heads-Up Display (HUD)APIX connectivity to the Driver’s Display (DFE)2.4GHz/5GHz WiFi ConnectivityBluetooth EDR/BT 5.0 connectivityNavigation satellite connectivity (GNSS)100BASE-T1 Ethernet1GBASE-T1 EthernetAR-CAM ConnectivityAPIX connectivity to the Central Information Display (CID)1-3x USB ConnectivityThis system presents a few interesting new pieces of connectivity I haven’t seen on previous versions of BMW’s infotainment! Of particular interest to me are the DCS and DFE connections.According to the documentation I could find, the new Driver Camera System “detects the alignment of the driver’s head and their line of sight. This is required for the ‘Fatigue Alert’ function.”As for the DFE connection, it may seem boring at first sight: it just connects to the driver’s display, right? Well, that “driver’s display” is actually the vehicle’s instrument cluster. This means on the newest generation of vehicles, BMW appears to have fully removed the dedicated “KOMBI” instrument cluster module, instead relying on the head unit to drive both the instrument cluster and infotainment systems!Overall, some cool new changes to the latest sys...