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Power Cable PCU-4
The power cable connects the wireless handsfree unit HFW-1
to the vehicle's power supply (DC socket).
The red wire must be connected to the + voltage on the vehi-
cle's power supply via the supplied fused connector. The black
wire must be attached to a good negative GND connection.
The blue ignition sense (IGNS) wire is connected to +12 V volt-
age con trolled by the vehicle's ignition key via the supplied
fused connector.
See section "Ignition Sense".
The yellow wire is used for car radio muting (CRM). The line
goes down to 0 volts during a call. See section "Car Radio Mut-
ing".
BLUE
YELLOW
RED
BLACK
Cables
Ensure cables are routed as far away as possible from the
vehicle's electronic systems (refer to WARNINGS)*. Also,
ensure that cables are not subjected to undue mechanical
stress e.g. under seats or against sharp edges.
* To prevent disturbance, cables should be routed as far away
from the interference source as possible.
Ignition Sense IGNS
The blue wire of the power cable PCU-4 is used for the ignition
sense feature. The use of ignition sense is recommended to
prevent accidental draining of the car's battery and making the
automatic connection to the phone. The wire is connected via a
1 A fuse to a 12 volt potential that is controlled by the ignition
8
IGNS
CRM
12V
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