![]() ![]() Which wire goes to which speaker can be easily determined with a battery of 1.5 V. A7 and A4 must be connected to +12V to get radio power on.Ĭonnector B is used only for the speakers. *Wire colors are typical and may be changed without notice.Ī4 and a7 pins may be reversed (a4=acc switched, a7=batt fix) in some Head Units, i.e. +12 V with the ignition key is in the ACC or ON position. +12V Main Power (Switched via Ignition key). The wire from lighting a cigarette lighter can be used for the same purposes. If the dashboard of your car has a light control function, this pin should be connected in order to regulate the brightness. ![]() For some it actually illuminates the radio display - the others can dim the lights. +12 V input on the car when the lights are on. Output from the stereo +12 V (maximum 150 - 300mA) power supply for automatic or electronic antennas.ĭial-light illumination (car side light circuit). Connects the radio directly to the battery. +12 V input on the radio with the ignition switched on the ignition and the car is in gear to move backwards. Satellite navigation uses this signal, the GALA signal (pin 1) and an internal laser gyroscope to calculate position in the absence of satellite signals. Mute from Cell-Phone. This pin is used to silence the audio cd, earthed by some other external components such as a mobile phone that is connected to the radio. ![]() On some equipment this pin is used, instead, for the rear-view camera control input, which carries the 12v backup-light signal to the head unit to tell it to display video from the backup camera. Note: If the speedometer stops working when the radio is connected, then the pin is probably grounded because radio probably uses this pin for another function, except for GALA. It needs the output from the speed sensor. This pin is used in some radio equipment to automatically boost up the volume. ![]()
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