Radio (except Japan) – circuit operation

RADIO (EXCEPT JAPAN) – CIRCUIT OPERATION

CIRCUIT OPERATION

The audio system consists of a new head unit, and for mid/high-range, a subwoofer and subwoofer amplifier. For mid- and high-range, the system is also equipped with a radio waveband switch and a tune switch, a volume up and a volume down switch which are located on the fascia next to the instrument cluster. The control head is equipped with an anti-theft feature which makes the unit inoperative once battery power is removed. A security code must be entered to restore power to the unit. On every level the system is equipped with two rear and two front speakers. Optional front tweeters are available for high line radio. Battery voltage is provided to the control head at all times through the P wire. In addition to monitoring the anti-theft feature, this input keeps the preset station memory alive. Whenever battery power to the unit is lost, the anti-theft code must be entered and the preset stations must be reprogrammed. When the Radio (Z111) and the ignition are turned on, the voltage signal through the LGO wire and the control head  wakes up
the unit. The Radio (Z111) plays, the VF display comes on, and the control unit buttons illuminate. The VF display is dimmed when the headlights or park lights are turned on. When the lights are on, voltage from fuse F8 of the Fascia Fusebox (P126) is applied to the Radio (Z111) terminal 6, connector 230 signalling the Radio (Z111) to dim the display.