DTC U3003-16, 09-ER20: VOLTAGE DECREASE INPUT FROM BATTERY Mazda CX-5 I

DETECTION CONDITIONS & POSSIBLE CAUSES Description Voltage decrease input from battery Detection condition With the ignition switched to ACC or ON, the audio unit detects voltage from the battery of 10 V or less for 30 s or more. Fail-safe function - Possible cause Battery malfunction Generator malfunction Audio unit connector or terminal malfunction Audio unit power supply circuit malfunction Short to ground in the wiring harness between audio unit terminal 1B and battery (+) terminal. Short to ground in wiring harness between audio unit terminal 1R and ACC RELAY AUDIO1 15 A fuse malfunction AUDIO2 15 A fuse malfunction CABIN. +B 50 A fuse malfunction MAIN 200 A fuse malfunction Open circuit in wiring harness between audio unit terminal 1B and battery (+) terminal Open circuit in wiring harness between audio unit and terminal 1R Audio unit malfunction