Credit: Jungmin Lee
I installed a MOMO PROTOTIPO aftermarket steering wheel using a newer Nissan hub (for the Z/V chassis) because it’s designed to work with the clock spring. I had to make some small modifications to fit it on my SM525V, and you’d need similar changes for 4th gen models.
Steps I Took:
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Aligning and Drilling:
I matched the hub cutout to the clock spring nub. I drilled three holes for the cancel cam (for the blinker auto-cancel). You can skip this if you don’t mind losing auto-cancel in certain positions—you can just rotate the cancel cam to line up with existing holes. -
Shaving the Hub:
The hub didn’t seat all the way because a wall around the clock spring harness was in the way. I used a Dremel to carefully shave down the hub until it fit. -
Keeping Audio Controls:
I wanted to keep the steering wheel audio controls (SM5s have these instead of cruise). I used a Fanatec paddle shifter adapter bracket, PCB support bolts, and figure 8 fasteners to attach the controls. I also extended the harness to run through the hub’s skirt, and trimmed part of the skirt so the SWC connector would fit. -
Wiring the Horn:
I added a horn harness while extending the SWC harness. The hub is anodized and not conductive, so I gently sanded the shaft contact edge to make the horn button work. -
SRS (Airbag) Light:
To cancel the SRS warning, I plugged a 2-ohm resistor into the SRS connector.
Final Result:
Only the SRS (airbag) was deleted. Everything else stayed in its original factory location.
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