First read and observe the introductory
information and safety warnings
You will need an external aerial to use a two-way radio in the vehicle.
Any retrofit installation of electrical or electronic equipment in the vehicle will affect its vehicle type approval. Under certain circumstances, this could mean that you might lose the type approval for the vehicle.
Volkswagen has approved the vehicle for use with two-way radios providing the following conditions are observed:
An external aerial is needed to give the equipment its optimal range.
Check first with a qualified workshop if you wish to use a two-way radio with a transmitting power of over 10 watts. A qualified workshop is familiar with the technical options for retrofitting. Volkswagen recommends using a Volkswagen dealership for this purpose.
Please observe legislation as well as the instructions and information given in the operating manuals for radio equipment.

WARNING

CAUTION
Repairs and faults in the airbag system
Information stored in the control unitsVolkswagen Touran Owners Manual. Checklist
Always carry out the following actions for changing a bulb in the
given order :
Park the vehicle on a flat and solid surface
at a safe distance from the flow of traffic.
Apply the handbrake Braking, stopping and
parking Brakes Parking .
Turn the light switch to position 0 ...
Volkswagen Touran Service Manual. Cigarette Lighter Illumination Bulb -L28-, Removing and Installing
Note
On some vehicle equipment levels, socket illumination is via
Light Emitting Diode (LED) instead of a bulb. These LEDs are
integrated with the illumination housing and cannot be serviced
or replaced separately.
...