Terminal and Reference Value for Audio Unit (Base System)

Terminal (Wire color)		Item	Signal input/output	Condition		Reference value (Approx.)
+	-			Ignition switch	Operation
2 (L)	3 (W)	Audio signal front LH	Output	ON	Receive audio signal
4 (G)	5 (V)	Audio signal rear LH	Output	ON	Receive audio signal
7 (GR)	Ground	ACC power supply	Input	ACC	-	Battery voltage
11 (P)	12 (R)	Audio signal front RH	Output	ON	Receive audio signal
13 (L)	14 (Y)	Audio signal rear RH	Output	ON	Receive audio signal
19 (Y)	Ground	Battery power supply	Input	OFF	-	Battery voltage
20 (B)	Ground	Ground	-	ON	-	-