@mmi I am sure your earlier reply regards firmware update for the coolant heater is the way forward.
I have however got a few questions you or others may be able to answer.
Do you also have a factory air heater installed, and if so can you operate either or both via the roof
control unit and remote?
If so do you have an extra option in the roof control?
My van only has Aux heater, Ventilation, or Back.
I beleive you may have a T6, built before Nov 2019, I'm not sure. It would seem your roof control is an earlier version of mine.
I would think to operate both heaters it would need have an extra option available? ( Aux heater 1, Aux heater 2, Ventilation, Back. Etc).
I have checked wiring diagrams relevant to my van for both coolant and air heater see below
I will need to remove left front seat to confirm that the connectors are populated as shown but it appears
that both heaters are connected to the LIN bus.
If this is the case then the remote signal is received by both heaters, but perhaps the roof unit decides which one to start?
I wonder if the key to this might be in the roof control unit (previous models had controller 6E \\ J702).
My van does not have a 6E controller.
Strangely, EX21 shown in coolant diagram is shown as dash instruments in the Fitting Locations Middle file on Erwin.
Maybe there is coding options there?
I have however got a few questions you or others may be able to answer.
Do you also have a factory air heater installed, and if so can you operate either or both via the roof
control unit and remote?
If so do you have an extra option in the roof control?
My van only has Aux heater, Ventilation, or Back.
I beleive you may have a T6, built before Nov 2019, I'm not sure. It would seem your roof control is an earlier version of mine.
I would think to operate both heaters it would need have an extra option available? ( Aux heater 1, Aux heater 2, Ventilation, Back. Etc).
I have checked wiring diagrams relevant to my van for both coolant and air heater see below
I will need to remove left front seat to confirm that the connectors are populated as shown but it appears
that both heaters are connected to the LIN bus.
If this is the case then the remote signal is received by both heaters, but perhaps the roof unit decides which one to start?
I wonder if the key to this might be in the roof control unit (previous models had controller 6E \\ J702).
My van does not have a 6E controller.
Strangely, EX21 shown in coolant diagram is shown as dash instruments in the Fitting Locations Middle file on Erwin.
Maybe there is coding options there?
Attachments
Last edited: