Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost to diagnose the B156D Toyota code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The Diagnostic Trouble Code (DTC) is set when the stereo component tuner assembly is not connected while the ignition switch is ON or ACC, or the communication between the radio and display receiver assembly and the stereo component tuner assembly is not possible when the engine is started.
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