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Post by eventz on May 2, 2023 13:38:53 GMT
I recently picked up a 2019 S3 steering wheel with paddle shift and installed it on my A3. Everything seems to be connected properly and all the buttons work, the paddles light up but don’t actually seem to work(shift). What coding is required to activate the shift paddles?
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Post by dv52 (Australia) on May 3, 2023 0:34:38 GMT
eventz : Hi. Let's begin by talking about wiring (because lots of these questions have their answers in the wiring diagrams) -here's a very cut-down diagram of how the paddle-sifters are connected to the steering wheel components:
Notice that the separate UP and DOWN paddles are directly wired to different components. The DOWN paddle is terminated on the left-side buttons (E440) in my picture - E440 is eventually connected back to J453 (not shown in my diagram). The UP paddle wiring is much simpler - it's directly connected to J453!
So, despite the fact of the intervening termination of the DOWN paddle to E440 - both shifters are in reality peripherals of J453 - which is called the Multi Function Steering Wheel Control Module in VCDS, but it is abbreviated to MFL in OBD11. And, clearly because the MFL is physically remote from the auto-trans module - UP/DOWN driver requests from the paddles are communicated over the CAN bus from the initiating module (i.e. MFL) to the DSG module.
Hopefully, you are still following my words thus far!
Now, let's continue the inter-module messaging discussion and talk about how the MFL is connected to the CAN network - the MFL is not a fully registered CAN module in the sense that it has the normal CAN-high and CAN-low wires. Instead the MLF uses what's called "LIN" (Local Interconnect Network) protocol to communicate with a module that does have full CAN registration. LIN is a single wire comms set-up. The fully registered module the connects to the MFL is called the "Master LIN module" and on a MQB platform car (like your Audi), it's the Gateway module (J533) that lives @ address hex19 on the CAN network.
Hence you will find the MLF as a subsystem of the Gateway module on the SCAN report for this car
Finally, let's talk about datasets - which are the software versions (firmware-if you like) that operate the modules in the CAN network of your Audi. As you will understand (I hope) from the diatribe above, it's important for the correct datasets to be installed in both the Gateway module and in the MLF for the paddle-shifter facility. I'm not sure how the 2 x modules in this car are set-up for paddle-shifter operation, but here's a typical arrangement that has paddle-shifter functionality from my MQB database:
Address 19: Gateway (J533)
Part No SW: 3Q0 907 530 L HW: 3Q0 907 530 C Component: GW MQB High 436 4326 Multi Function Steering Wheel Control Module (J453) Part No SW: 8W0 951 523 F HW: 8W0 951 523 F Component: MFL H04 0002
How do these details compare with the same 2 x modules on your car?
Don
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