[Voice + Bluetooth]

Fig 1: Audio Remote Control Connector Terminals (Voice + Bluetooth)

Courtesy of KIA MOTORS AMERICA, INC.

Switch	Connector terminal	Resistance (±5%)	Output voltage
Voice	2-4	10.71 kΩ	3.5 V ± 0.22
Call off	2-4	18.91 kΩ	4.0 V ± 0.22
Call	2-4	40.91 kΩ	4.5 V ± 0.22