Performing repairs, notes
Before beginning repairs on the electrical system:
- Switch off all electrical consumers.
- Switch ignition off and remove ignition key.
- Disconnect negative ( - ) battery terminal.
- When disconnecting and reconnecting battery terminals, observe all applicable Notes and torque specifications, as well as instructions on performing OBD program and electrical system function checks as specified. Refer to 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
Use valid current flow diagram. Refer to Wiring Diagrams & Component Locations.
Removing and installing interior trim. Refer to 70 - INTERIOR TRIM .
Observe manufacturer's operating and installation instructions for mobile telephones, two-way radios and antennas.
Secure wiring harnesses to cable ties. Wrap connectors with foam to avoid rattling noises.
Transmitted output and possible installation locations
Volkswagen permits the installation and operation of radio units if the transmitted power on point of the antenna base, listed in table, is not exceeded. For prescribed antenna locations see table.
The limiting values according to VDE 0848 part 2 (max. permissible radiation strength for personal protection) must be adhered to by reducing the transmitted output.
Voltage supply
When retrofitting a transmitter/receiver unit in the vehicle, the battery is used to connect the positive and negative wire.
The wiring harness must be manufactured additionally:
- Voltage supply positive via red wire, 2.5 mm cross section.
- Voltage supply negative via brown wire, 2.5 mm cross-section.
The positive wire must have a fuse which must be located very close to the battery. Therefore a fuse holder must be secured next to the battery. Both wires must be encased in an insulating hose.
Make suitable connections at battery end.
On unit end proceed as per owner's manual.
The additional wiring harness must be routed separately from vehicle wiring, the distance apart must be at least 10 cm.
- For some telephone systems and radio communication units an additional terminal 15 (ignition) is necessary. Then a black connection (1.5 mm cross-section) must be connected from transmitter/receiver unit to terminal 15a. Refer to Current flow diagrams, Electrical fault finding and Fitting locations.
- Ensure wiring connections are not routed parallel to the standard wiring.
Antenna and antenna wire
A shielded wire must be used between transmitter/receiver unit and the antenna. The shielding must be grounded to unit and antenna.
At the same time ensure correct and continuous Ground (GND) connection of antenna base wire to vehicle body.
The transmitting system must only be used when shielded to prevent interference in the antenna wiring. To ensure the system it is tuned and operating correctly it is recommended that an output/performance check is carried out.
Further additional installations
The installation of further electronic equipment like business equipment (e.g. TV, FAX) or household equipment (e.g. electrical cool box) is only permitted, if these appliances are marked with a CE or e-sign (Europe only).
Voltage supply is performed via a separate wiring harness and secured by a fuse.