Installation
29
Power cable PCU-4
The power cable has the following wires and fuses:
• +12 V, car battery +, red (1)
• Ground, car battery -, black (2)
• Car radio mute, yellow (3)
• Car ignition sense, blue (4)
•2 A fuse (5)
•1 A fuse (6)
To connect the power cable, do as follows:
1. Connect the black wire to the vehicle ground.
2. Plug the yellow wire into the mute connector of the car radio.
When a call is answered, the car kit switches the yellow wire to 
ground, muting the car radio. When the call is ended, the yellow wire 
is separated from ground, and the car radio is unmuted.
If the car radio does not have a mute connector, this wire can be left 
unconnected. In this case, the car radio is not muted automatically 
when you answer a call.
Alternatively, an additional relay can be used to mute the car radio 
and to connect the car kit directly to the car speakers. The mute 
signal is used to switch the relay.
3. Connect the blue wire to the ignition sense line of the car using the 
supplied 1 A fuse.
Some vehicles do not support the ignition sense connection. In this 
case the blue wire can be left unconnected but the car kit does not 
switch off automatically when the car ignition is turned off.
9200326_en1.fm  Page 29  Thursday, January 25, 2007  11:09 AM