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AUDIO AV-31 C D E F G H I J L M A B AV 3. CHECK VEHICLE SPEED SIGNAL 1. Connect audio unit connector and combination meter connector. 2. Start engine and drive vehicle at more than 40 km/h (25 MPH). 3. Check the signal between audio unit harness connector M39 OK or NG OK >> Replace audio unit. NG >> Check combination meter system. Refer to in “COMBINATION METERS”. 18 – Ground Reference Value for Audio Unit or minals and Reference Value for PKIB3844E |