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PremierSprinter · 05-24-2015, 01:48 AM

My train of thoughts after reading the PDF is that the rack would be functional by hooking up the 80A power and ground wires and then connecting terminal 15. The computer should go in to defaults. Unfortunately, it is unknown how it would react. The rack gives less and less assist the faster you go and it gives more assist the faster you are turning the wheel, which accounts for the needs for VSS input as well as steering angle. I would like to believe that the vehicle speed is the most important as it would scale down rack sensitivity at higher speeds, though the steering angle sensor would be much easier to add. By using the MK5 cluster, you should be able to wire just power to the column module and the sensor would work. Stalk functions would have to be spliced in to the MK4 wiring which may be a bit of a pain. The other option would be to fix just the steering angle sensor assembly somewhere else on the column and hide the MK5 steering column module somewhere inside of the dash, keeping all MK4 column components. This might be a better option if I decide to swap in the MK4 MK60 ESP system as it too has a steering angle sensor.

The more important sensor (in my opinion) would be the VSS. Unfortunately, it gets the signal from the ABS module over the CAN and the ABS module gets the signal from the wheels speed sensors on the hubs. I'm not sure if the MK4 and MK5 are using similar ring configurations. If they are, I could probably piggy-back one wheels speed sensor and again wire the module with just the minimum wires needed to turn on and generate CAN signals. Creating a small network between the ABS module, steering column module and steering rack would in theory give complete OEM function.

The EASIEST and possibly most efficient method would be to put the terminal 15 wire to the rack on a switch and only turn on power assist when you need it. It's so simple that it is almost stupid not to do it this way… though it would be really cool to make it all function like OEM. If I did this, it would also give me the ability to experiment with the rack in its default settings, missing CAN signals to see how safe it is at highway speeds and to see where in the range of sensitivity it defaults.

05-24-2015, 01:48 AM	#18 (permalink)
PremierSprinter EcoModding Lurker Join Date: May 2015 Location: Gaithersburg, MD Posts: 26 Thanks: 1 Thanked 7 Times in 6 Posts	My train of thoughts after reading the PDF is that the rack would be functional by hooking up the 80A power and ground wires and then connecting terminal 15. The computer should go in to defaults. Unfortunately, it is unknown how it would react. The rack gives less and less assist the faster you go and it gives more assist the faster you are turning the wheel, which accounts for the needs for VSS input as well as steering angle. I would like to believe that the vehicle speed is the most important as it would scale down rack sensitivity at higher speeds, though the steering angle sensor would be much easier to add. By using the MK5 cluster, you should be able to wire just power to the column module and the sensor would work. Stalk functions would have to be spliced in to the MK4 wiring which may be a bit of a pain. The other option would be to fix just the steering angle sensor assembly somewhere else on the column and hide the MK5 steering column module somewhere inside of the dash, keeping all MK4 column components. This might be a better option if I decide to swap in the MK4 MK60 ESP system as it too has a steering angle sensor. The more important sensor (in my opinion) would be the VSS. Unfortunately, it gets the signal from the ABS module over the CAN and the ABS module gets the signal from the wheels speed sensors on the hubs. I'm not sure if the MK4 and MK5 are using similar ring configurations. If they are, I could probably piggy-back one wheels speed sensor and again wire the module with just the minimum wires needed to turn on and generate CAN signals. Creating a small network between the ABS module, steering column module and steering rack would in theory give complete OEM function. The EASIEST and possibly most efficient method would be to put the terminal 15 wire to the rack on a switch and only turn on power assist when you need it. It's so simple that it is almost stupid not to do it this way… though it would be really cool to make it all function like OEM. If I did this, it would also give me the ability to experiment with the rack in its default settings, missing CAN signals to see how safe it is at highway speeds and to see where in the range of sensitivity it defaults.