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8. Electric Connection
The electric connection should be made by a specialist.
To avoid short circuits and resulting damage to the SD tuner, the negative pole (earth) of the
vehicle battery must be disconnected during connection.
Only connect the negative pole of the battery when you have completely connected the system
and checked the connections.
You should only use a voltmeter or a diode test lamp for checking the voltage on the on-board
cables as normal test lamps consume excessive currents and can thus damage the electronic
system of the car.
When laying the cables, make sure that they are not squeezed or scoured on sharp edges. Use
rubber grommets for the feed-though points.
Connection to the speakers must be two-wire each. Insulate any open connection points. Make
sure that the cables are not damaged by sharp edges.
Only use speakers with sufficient load capacity (see “Technical Data”).
Observe that all speakers have the correct polarity - that is, that plus and minus marks match.
The connecting cables of the loudspeakers are usually coded: Some speaker manufacturers
indicate the (+) wire by means of an additional colour stripe, others use a corrugated cable for
the (+) terminal and a smooth one for the (-) terminal.
The system was designed for the operation at speaker impedances of at least 4 Ohm. Never
connect speakers with a lower impedance.
In most vehicles the cables for the electric connection and the connection of the speakers have
been laid directly to the slot.
If this is not the case, please make sure that any cables placed later are secured by the respec-
tive on-board fuses (see vehicle operation manual).
a) Connecting the Aerial
• Connect the aerial plug of your vehicle with the aerial socket at the back of the radio (socket next to the
cinch terminals).
• If your vehicle has a different aerial plug, please use a suitable adapter, available in specialist shops.
