Volkswagen Polo Service & Repair Manual: 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 |
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| 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.
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
re ...
Because towing places higher demands on the engine cooling
system, the cooling system is enhanced in vehicles that have
factory-installed trailer hitches, if necessar ...
Other materials:
Refrigerant Circuit with A/C Service Station, Filling
Caution
If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, do not connect the
A/C service station and do not extract the refrigerant.
...
Introduction
This chapter contains information on the following subjects:
→ Securing mounts, roof bars or load carrying system
→ Loading the load carrier system The roof of the vehicle has been designed
for optimum aerodynamic effect. Therefore, conventional mounts or other load carrier
sy ...
Underseal
First read and observe the introductory information
and safety warningsThe underside of the vehicle is coated to protect it from
corrosion and damage. The protective coating on the underside of the vehicle could
be damaged when driving. Volkswagen therefore recommends that the protective coati ...
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13-Pin« Trailer Socket
Engine Cooling