Tweet
Originally posted by jboogie
View Post
The short answer to your question is YES - the heated seats on a 2019 Arteon is part of the CAN network (but the same is NOT true for the 2013 Jetta)
The 2019 Arteon is built on a MQB platform and the 2013 Jetta has a PQ25/35 platform - so very different cars!
The basic set-up for seat-heating on MQB platform cars is as shown in my very cut-down wiring diagram below:
Please note that my diagram is meant as a rough wiring guide only - it is intended to show the high-level arrangement for seat-heating on MQB platform cars.
So, to explain: The central smarts for the seat-heating function is the module that the official wiring diagram calls "Onboard supply control unit". This module lives @ address 09 on the CAN network and it is more generally known as the Body Control Module (BCM), or the central electrics module. For ease of writing, I'll use "BCM" in the rest of this reply
For the purpose of seat-heating, you should think about the BCM as receiving input signals and separately providing output power based on the way that the cabin occupants select the seat-heating switches.
In more detail, seat-heating works like this: the BCM receives input variables from the Air conditioning module (this is where the seat-heating switches reside) and based on these signals, the BCM provides an output - which is power to the actual heating elements that are physically bonded to the driver/passenger seat cushions. As shown in my diagram, the BCM also manages the overall battery-rail power-supply for seat-heating which is via fuse position 26 on the C fuse block.
As you can see from my picture, the seat-heater elements are directly connected to the BCM - but the input variables are sent to the BCM from the air conditioning module as CAN based messages. Both the BCM and the air conditioning module live on the Convenience CAN bus on MQB platform cars
The wiring set-up for the Jetta is very different - it is controlled by a stand alone module, which not surprisingly is called Heated front seats control unit (J774). This module is NOT part of the CAN network.
I assume that you intend to simply plug-in the Arteon seat heating elements into the jetta's wiring loom (does the Jetta already have J774?). If so, there are a few different wiring arrangements on MQB platform cars that result in various pin-outs. I'm not sure how many pins are on the Arteon seats but you may need to re-allocate the individual heating elements on the new seats to suit the Jetta factory plug.
For completeness, my picture also shows the "Data bus diagnostic interface". This is normally called the Gateway module, or CAN Gateway module. It's included in my picture purely for reference - because of the Gateway module's central role in orchestrating all CAN messages
Don
PS: here is an example of different circuit versions of seat heating for the Golf mk7/mk7.5:
Comment