High Line System Radio Cassette

High line system radio cassette
The high line radio cassette is located in the center of the fascia and contains the radio and tape player. Two clips (accessible through slots in the front of the unit) secure the unit. To remove the radio cassette unit the two clips must be released with a special tool. The high line system can be controlled from the fascia mounted radio cassette, or from remote radio control switches on the left hand side of the steering wheel. In vehicles fitted with radio headphone amplifiers, the rear seat passengers can control their individual audio output using a headphone amplifier control panel. The audio signal can be from the radio, cassette player or a CD-autochanger. A logic control circuit in the radio cassette player controls the operation in the various control modes.

The radio cassette has a display screen, information shown includes current status, station (Radio mode), CD-autochanger track/disc status or status of headphone amplifier. Power for illumination on the radio cassette is supplied from the passenger compartment fusebox. A main fuse is also located in the connector socket area on the back of the radio cassette. When the radio cassette switch is on, power is made available via internal circuits to the radio headphone amplifiers.

Security code function
A combination of buttons on the radio cassette are used to input and change security codes. Security codes make the unit unusable if the unit is disconnected from the vehicle without deactivating the security code. The radio cassette has an internal memory chip that stores the information, if the power is removed from the unit the chip will activate the security code feature. For this reason the security code feature must be deactivated before the unit is removed or the vehicles battery is disconnected.

Audio functions
A rotary knob allows changes of levels or selections during the various modes of operation, this includes volume, bass, treble, fader and spatial on/off.

Cassette functions
The radio cassette has buttons for the following cassette functions; eject, fast forward, rewind and dolby. The dolby symbol is shown on the dot matrix display screen if dolby mode is selected.

Radio functions
The radio cassette has buttons for the selection of AM or FM reception. Selection of the radio station is controlled by the use of the multi-function buttons on the radio cassette player, the radio headphone amplifiers or the remote radio controls on the steering wheel.

CD-autochanger functions
The CD button on the radio cassette player allows selection of the CD-autochanger. CD disc and track selection is controlled by the use of the multi-function buttons on the radio cassette player, the radio headphone amplifiers or the remote radio controls on the steering wheel.

Traffic Information function
A traffic/news information button (1) allows traffic or news information to be selected on the FM waveband only, in this mode the radio will mute when traffic or news messages are received. After the traffic or news message the radio, cassette tape or CD will resume play, the traffic and news information varies with the country of use and radio band selected.

Multi function buttons
The music symbol button is used for mode selection for adjustment of bass, treble etc. depending on current mode selected. Operation of presets 1-6 depends on current mode of operation and allows selection of radio band (Radio mode on) or CD-autochanger disc (in the CD mode). Search/Seek (Mode dependent) manual or automatic selection of band or track. MAN (mode dependent) when pressed the button allows manual operation or alternate mode selections such as manual tuning, compact disk cue/review, tape forward/rewind modes. The mode dependent SCAN button allows automatic searching of radio bands, tape or compact disk tracks.

Internal memory
An internal memory chip stores the station presets and security code, power is supplied internally to the chip via a permanent power feed, supplied from the passenger compartment fuse box.

Radio cassette player connector pin details.

Radio Cassette Player Connector Pin Details - Part 1:

Radio Cassette Player Connector Pin Details - Part 2:

Inputs and outputs
The radio cassette player receives a mute signal from the telephone system if a call is received, when the call finishes the mute is removed and the system resumes play. Inputs are also received from the steering wheel control system (mid line and high line systems). When the system is turned on, the high line systems radio cassette player:

^ sends a 'power on enable' to the power amplifier
^ sends an 'enable' signal to the radio headphone amplifiers.

On the high line system the radio cassette player also sends and receives signals from the CD-autochanger and rear headphone amplifiers (if fitted). On high line systems the radio cassette player sends audio signals to the power amplifier.