User Guide

RH-12/RH-28
Car Installation Kit CCS Technical Documentation
Page 20 Nokia Corporation Issue 1 02/04
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 key. Do not connect it directly to the high voltage
sections of
the ignition circuit.
Car Radio Muting CRM
The car kit offers a feature that can mute the car radio automatically during a conversa-
tion. The car radio muting feature is based on a grounded line, so it means that in
standby, the yellow wire (CRM) is not grounded and car radio works normally, but during
a call, line is grounded and car radio is muted.
Some radios have separate supplies for amplifiers and motors, and another for memory
backup purposes. Very often these radios also have a secret code system, which activates
itself if a break in the memory supply is detected. Be careful when installing the relay not
to break the memory supply (usually marked ACC or +MEM).
BLUE
YELLOW
RED
BLACK
IGNS
CRM
12V