Hi Mark,
as I started the e-Up OVMS project years ago my first
approach was the T26 cable. The reason for that more complicated
cable was that with the direct connection to CAN3, I was able to
get write access for i.e. climate control.
My way to do so was replacing the VW TCU under the passenger
seat and connect to the VW T26 connector there (hence the name
T26).
As the project developed the direct ODB access was added by
other very capable developers to gain more data from the car. So
we ended up with 4 cables. T26 alone, ODB alone, ODB + T26 under
the passenger seat, ODB + T26 at the passenger footwell panel.
T26 alone and ODB alone have only historical value, so there
needs to be a decission, if you want to make the hybrid cable
for under the passenger seat or at the passenger footwell panel.
The advantage of the "under the seat" cable is, that you can
use the GPS and GSM antenna of the car. Disavantage is, the you
have to struggle with the seat. The "footwell" cable is much
easier to install, but OVMS will need extra antennas for GPS and
GSM.
I would suggest, that the decission about what cable to make
should be discussed here briefly first.
Then someone will probably be able to provide the length of
the cable.
Information on the connector, wire type and pinouts are in
the documentation. The connector is a workaround as we were not
able to find the original female T26 plug. But perhaps things
has changed and somebody has more information on that now.
Hope this is of some help.
Regards
Chris
Am Mittwoch, dem 26.11.2025 um 10:49 +0800 schrieb Mark
Webb-Johnson via OvmsDev:
We’ve had some enquiries regarding making a standard OVMS
cable T26 for VW eUP, Skoda E IV, and Seat MII electric.
From my understanding, the cable is variant 1 described
here:
If there anybody here knowledgeable about this, that could
help specify the cable exactly? Things like:
- Exact T26 connector
- Length of each cable segment
- Cable wire type
- Pinouts
Preferable somebody who has already done it and can
document exactly what they have.
Also presumably this requires unplugging the existing OCU,
and what is the impact of that?
Regards, Mark.
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