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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 918 (Audio, Visual, Navigation System (BOSE Audio) (With Navigation)) >> DTC/Circuit Diagnosis >> DTC U121F: Av Control Unit >> DTC Logic

DTC Logic

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
DTC Display contents of CONSULT DTC Detection Condition Action to take
U121F INTERNAL COMM [U121F] Internal malfunction of AV control unit (internal communication error) is detected. AV control unit power supply and ground circuit.
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