Volkswagen Touran Service Manual: Technical Requirements
| Factory-Installed Trailer Hitch. Refer to
→ Chapter "Factory-Installed Trailer Hitch". |
| Retrofitted Trailer Hitch. Refer to
→ Chapter "Retrofitted Trailer Hitch". |
| Ball head. Refer to
→ Chapter "Ball Head". |
| Trailer socket. Refer to
→ Chapter "Trailer Socket". |
| Towing Recognition Control Module -J345-. Refer to
→ Chapter "Towing Recognition Control Module -J345-". |
| Engine Cooling. Refer to
→ Chapter "Engine Cooling". |
| Exterior Mirrors. Refer to
→ Chapter "Exterior Rearview Mirror". |
| Reinforced Shock Absorbers and Coil Springs. Refer to
→ Chapter "Reinforced Shock Absorbers and Coil Springs". |
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Factory-Installed Trailer Hitch
| If the vehicle was already delivered from the factory with a
trailer hitch, all of the technical and legal requirements for
towing a trailer have already been taken into account. |
| Note that a "13-pin" trailer
socket has been installed in many models since the beginning of
1988 instead of the conventional "7-pin"
socket. This new socket allows additional electrical consumers
in the trailer to be connected, such as back-up lamps. This was
not possible with the previous 7-pin socket. |
| If the trailer that will be hitched has a
"7-pin" connector, an adapter cable
available from authorized Volkswagen dealers can be used. |
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Retrofitted Trailer Hitch
| Note the following if the vehicle will be retrofitted with a
trailer hitch: |
| The trailer hitch is a safety-related component. Only use
approved hitches that were designed to meet the vehicle
requirements. Trailer hitches from the Volkswagen Accessories
program are recommended because they are identical to the
hitches installed at the factory. The installation instructions
provided with these trailer hitches have also been approved by
Volkswagen. |
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Ball Head
| 350 to 420 mm, measured from the center of the ball to the
road surface, with the total weight within the permitted range |
| At least 65 mm, measured from the center of the ball to the
bumper |
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Trailer Socket
| Connect the trailer socket to the vehicle electrical system
of the vehicle pulling the trailer according to the manufacturer
instructions. |
| Refer to the applicable wiring diagrams or manufacturer
installation instructions when installing the trailer hitch. |
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7-Pin" Trailer Socket
| If more electrical consumers need to be connected than the
"7-pin" socket allows, a second
"7-pin" socket must be installed.
Pin assignment must conform to DIN ISO 1724: |
| 5 - Right headlamps, side marker lamps and license plate
lamp |
| 7 - Left headlamps, side marker lamps and license plate lamp |
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13-Pin" Trailer Socket
| The backup lamps, "continuous current"
and charging cable can be used on the trailer with the
"13-pin" trailer socket. A
"13-pin" trailer socket is
recommended if a bicycle rack will be installed or a camper will
be towed. |
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| Pin assignment must conform to DIN ISO 11446: |
| 3 - Ground for circuit 1 through 8 |
| 9 - Terminal 30 (permanent positive) |
| 10 - Terminal 15 (battery charging in trailer) |
| 13 - Terminal 15/30 ground |
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Towing Recognition Control Module -J345-
| The Towing Recognition Control Module -J345- recognizes
"trailer mode" when there is a power decrease of at least 5 W
→ Note and transmits this information to various control
modules via the CAN data bus. |
| The Vehicle Electrical System Control Module -J519- and the
Comfort System Central Control Module -J393- supply the Towing
Recognition Control Module -J519- with information via the CAN
data bus. |
| 1) |
At least turn signals or side marker lamps must
be switched on to detect "trailer mode". |
| For information on testing control modules, diagnosing
malfunctions, malfunction indicators and fault finding. Refer to
→ Electrical Equipment; Rep. Gr.97. |
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Towing Recognition Control Module -J345-, Retrofitting
| Retrofitting a Towing Recognition Control Module -J345-
approved by Volkswagen is possible, but it can pose problems due
to the connection with the vehicle CAN data bus. The control
module must then be coded in "Guided Fault Finding" using the
→ Vehicle diagnostic tester. |
 Note
| Installation of control module solutions that are available
from third parties and are not approved by Volkswagen is not
recommended. Installing such equipment voids the warranty.
Generally, these are connected to the tail lamps and not
integrated into the vehicle electrical system. This can result
in a misdiagnosis from the lamp monitoring function or to
malfunctions. Also, dimmed bulbs such as combined brake and tail
lamps cannot be activated. |
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Towing Recognition Control Module -J345-, Coding
| Refer to
→ Electrical Equipment; Rep. Gr.97 finformation on
coding. |
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Engine Cooling
| Because towing places higher demands on the engine cooling
system, the cooling system is enhanced in vehicles that have
factory-installed trailer hitches, if necessary. This is done by
installing a stronger or a second coolant fan and/or a larger
radiator. Vehicles designed for hot climates and/or with an A/C
system already have the enhanced engine cooling system. In the
Passat, a stronger coolant fan (PR number 0Y2) may also be
installed alone at the factory. This makes it easier to install
a trailer hitch later. |
| The cooling system should also be enhanced when a trailer
hitch is retrofitted, if the system was not already modified at
the factory. Otherwise the cooling system could overheat under
increased engine load, for example when driving in mountains, in
high temperatures or with high towing weight. When converting
the cooling system, use the engine cooling system components
designed for towing listed in the ETKA electronic parts catalog.
Refer to the procedures in the applicable repair manuals. |
| Enhancing the cooling system may only be avoided if the
engine will only be under moderate load, for example: |
| the combined weight is considerably less than the permitted
amount, |
| no high outside temperatures, |
| no driving at high altitude. |
| The coolant temperature gauge must always be monitored
closely. If the needle in the gauge moves high into the hot
zone, reduce speed immediately. It may be necessary to take a
break to allow the engine to cool. When doing this, let the
engine run at idle for approximately 2 minutes to prevent heat
buildup. |
Note
| In vehicles with an A/C system, switching the system off
will reduce the load on the engine cooling system. This also
improves vehicle acceleration and makes passing other vehicles
safer. |
| If the cooling system is not enhanced, the seller must
inform the buyer when selling the vehicle. |
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Exterior Rearview Mirror
| If the traffic behind the trailer cannot be seen in the
standard exterior rearview mirrors, additional exterior mirrors
must be installed. Both exterior mirrors must be installed on
folding mounts and adjusted to provide a sufficient range of
vision behind the vehicle. |
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Reinforced Shock Absorbers and Coil Springs
| Reinforced shock absorbers and coil springs on the vehicle
rear axle reduce pitching motions between the vehicle and the
trailer. If not already installed in the factory, these shock
absorbers and springs can often be retrofitted at authorized
Volkswagen dealers. Shock absorber and spring allocation. Refer
to the
→ Electronic Parts Catalog (ETKA). |
| Stabilization aids can also reduce pitching and rolling
motions. These aids are available from authorized Volkswagen
dealers in most European countries and can be installed there. |
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Operating and Driving Tips
Note
| Always read and follow the operating and driving tips in the
vehicle owner's manual. |
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The content of this guide has been divided into two section.
The first section contains information and important tips
about "towing a trailer". For ...
Trailer Hitch Type Label. Refer to
→ Chapter "Trailer Hitch Type Label".
Combined Weight. Refer to
→ Chapter "Combined We ...
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