Details On DTCs

U0186-02: (CMU) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with audio amplifier
Detection condition	Determination conditions	The connectivity master unit (CMU) detects a communication error with the audio amplifier.
	Preconditions	Not applicable
	Malfunction determination period	Not applicable
Fail-safe	Not applicable
Vehicle status when DTCs are output	Not applicable
Possible cause	Malfunction in wiring harness (including connector/terminal) between audio amplifier and body ground Malfunction in wiring harness (including connector/terminal) between battery/lead-acid battery (with Mazda M Hybrid)/DC-DC converter (without Mazda M Hybrid) and audio amplifier DTCs are stored in the emergency call unit/telematics communication unit Malfunction in wiring harness (including connector/terminal) between audio amplifier and emergency call unit/telematics communication unit Malfunction in wiring harness (including connector/terminal) between emergency call unit/telematics communication unit and connectivity master unit (CMU) Malfunction in wiring harness (including connector/terminal) between audio amplifier and connectivity master unit (CMU) Audio amplifier malfunction Connectivity master unit (CMU) malfunction