19
Getting Started
One-touch Private Call is set by the Service Provider.
1. If it is set to Simplex, then outgoing Private Call is Simplex 
too.
2. If it is set to Duplex, then outgoing Private Call can be 
duplex in TMO, Simplex in DMO with the last Group Call 
Originator number.
3. If it is set to Duplex, then outgoing Private Call can be 
duplex in TMO and cannot be initiated in DMO when the 
phone book index is required.
Function Keys 
External Alarm Key
To turn the External Alarm (Horn & Lights Alarm) on or off, 
press   (default function - if not programmed with another 
function by your Service Provide).
Use the Horn & Lights Alarm when you leave your car and 
want to be alerted if an important message arrives (Private 
Call, for example).
If the External Alarm function is pre-programmed, the car 
lights turn on and an alarm sounds to inform you of the 
incoming call.
Speaker Control Key 
Press  to activate or deactivate the loudspeaker (default 
function - if not programmed with another function by your 
Service Provider.
Backlight Key
If the backlight is set to Manual, there are five profiles of 
backlight intensity combinations (see “Setting the Backlight” 
on page 122). To change the backlight intensity, press   
In order to operate the Horn & Lights Alarm, you must install the 
GKN6272 accessory in your vehicle.
The ignition must be off for the Horn & Lights Alarm to work.