6
NG Radios
Reset and Voltage Monitoring
A radio reset is triggered by under voltage or the internal processor monitor. The reset
function restarts the radio, similar to turning it off and back on again. Operating voltage is
measured at the KL 30 input. The radio is switched off if the system voltage exceeds 17V
to protect the radio, it will switch on when the voltage falls below 16V.
GAL (Speed Dependent Volume)
The speed signal from the IKE/KOMBI is available to the radio over the K/I Bus. GAL is not
a feature on vehicles equipped with DSP.
Bus Communication
The radio communicates with other modules via the K bus or I Bus dependent on the
model. The information shared over the bus line includes:
IKE/KOMBI - Terminal status (KL 15, KL R)
LCM/LSZ- Lights on
IKE/KOMBI link to TXD- Diagnosis
MID or BMBT- button or rotary knob status.
GM- Key used to lock or unlock vehicle
MFL- audio controls status
NG radios do not use anti-theft codes. Operation of the radio is only possible if
connected to a bus line and the detection of at least one other component.
Multi Information Radio (MIR)
The Multi-Information Radio (MIR) is used in the E52 Z8 and is the first of the NG series of
radios. The MIR contains the radio receiver, display screen, and control panel all in one unit.
A cassette player is not included.
The MIR is used to control and display the:
GPS-Navigation System
Audio system including CD Changer
Telephone
Outside temperature
7
NG Radios
Station Search Button
Every time the MIR is switched on it looks to see if a navigation computer is installed and
displays the correct menu options. Text and symbols on the display are generated by the
navigation computer and transmitted to the MIR via the “Navigation” Bus. If the MIR does
not detect that a navigation computer is connected, the MIR itself will generate it’s own dis-
play signals. The screen display is monochrome only.
The navigation elements of the MIR will be discussed in the MK3 module.
Audio Mixing
Audio mixing allows the vehicle passengers to listen to navigation instructions without
muting the radio or CD player.
On-Board Computer Functions
Outside temperature is the only on-board computer display possible for the Z8.
AM FM
MODE
TONESEL
MENU
123456
AUDIO
NAVIGATION
TELEFON
A-TEMP
Photocell Sensor-used to control display backlight
Telephone Send/End-used to begin or end a call Menu Button-recalls main menu for display
Left Knob-radio volume control
Mode Button-switches between radio and CD operation
Station Keys-radio/CDControl Knob-used to control
operation of systems in display
