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Group 28 Design and Function
VECU Overview
The Vehicle Electronic Control Unit (VECU) receives
inputs and generates output signals for functions associ-
ated with cab devices. It also converts information into
digital data to be broadcast over the J1587/1708 Infor-
mation Link and the J1939 Control Link.
Note: The VECU may also be referred to as the “Cab
Controller” on the graphics display of the VN series dash
and in some Volvo publications.
VECU Programming
Each VECU is programmed with specific vehicle
performance characteristics corresponding to customer-
ordered options for that particular vehicle. This dataset is
stored in the VECU memory, making the VECU unique
to each vehicle.
For this reason, it is not possible to “swap” a suspected
faulty VECU with one from another vehicle without repro-
gramming the replacement VECU.
Replacement VECUs are programmed using the VCADS
Pro tool. Programming is based on the particular dataset
that matches the vehicle; datasets are stored in the
Volvo Data Administration (VDA) database. Authorized
technicians can update and/or alter software datasets,
change customer parameters, and perform campaigns.
For more information about the proper operation of the
VCADS Pro tool and VECU programming, please refer
to Information on VCADS Pro in Group O. This manual
is also available as a pdf file within VCADS Pro tool lo-
cated under Help.
Note: Customer parameter changes are not stored in
the VDA database. Therefore, after a replacement VECU
is programmed for the vehicle, it will have to be cus-
tomized to include those customer alterations.
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