Nissan Skyline GT-R Steering Wheel Boss Guide: R32, R33, and R34 Fitment

Changing the steering wheel on a Nissan Skyline sounds simple. Remove the factory wheel, install a steering wheel boss, bolt on the aftermarket wheel, connect the horn, and go drive. On many cars, it really is almost that easy.

On the R32, R33, and R34 Skyline, especially the GT-R models, there are a few important details that can make the difference between a clean installation and a car with a HICAS light, an airbag warning light, or a steering wheel that never feels quite centered.

The steering wheel is connected to the steering shaft, steering rack, and eventually the front wheels. On HICAS equipped Skylines, the steering wheel position is also part of the information the car uses for the rear steering system. That is why the correct steering wheel boss matters.

Why the Correct Steering Wheel Boss Matters on a Skyline

Most early R32 Skylines did not have airbags, including the R32 GT-R. Some cars did have more equipment depending on model, market, and year, but the bigger issue for most R32 GT-R owners is HICAS.

Most R32 GT-Rs came with HICAS, Nissan’s four wheel steering system. The tricky part is that Nissan changed the steering angle sensor and zero position setup during production. Because of that, an early R32 and a late R32 may require different steering wheel bosses even if they look similar at first glance.

If the wrong boss is installed, or if the steering wheel is installed off by one spline, the HICAS system may think the car is constantly turning. A common symptom is a HICAS warning light that comes on after a few minutes of driving. This is especially common on R32 GT-Rs after an aftermarket steering wheel has been installed.

We covered that issue in more detail here: Does your HICAS light turn on after five minutes of driving?

More HICAS information is also available here: GTRUSABlog HICAS articles

R33 and R34 Skyline Airbag Notes

The R33 GT-R was a different story from the R32. All R33 GT-R steering wheels had a driver side airbag. Later cars, generally 1996 and newer, had both driver and passenger airbags.

The R34 GT-R also used an airbag steering wheel. Because of that, fitting an aftermarket steering wheel to an R33 or R34 GT-R is not just a matter of choosing the correct spline and bolt pattern. You also need to consider the airbag system, horn wiring, turn signal cancel function, and any warning lights that may appear after installation.

Important note: Removing or modifying an airbag system can affect safety and may not be legal for street use in some areas. Always check your local laws and consider whether the car is being used for street, track, show, or off road purposes before removing factory safety equipment.

HKB Steering Wheel Boss Reference Table

HKB is one of the most common Japanese steering wheel boss manufacturers for Nissan Skyline applications. These kits are commonly used when fitting aftermarket steering wheels from brands such as Nardi, Personal, Momo, Sparco, OMP, and similar wheel patterns. Depending on the exact kit and application, HKB boss kits may support horn function, turn signal cancel, airbag warning light provisions, HICAS compatibility, or cruise control compatibility.

Use the table below as a starting point, but always verify fitment against your specific chassis, year, trim, airbag equipment, HICAS equipment, and cruise control equipment before ordering.

Model	Airbag	Cruise Control	Notes	HKB Boss
R32 Skyline Normal	No	No	No HICAS	ON-07
R32 Skyline	No	Yes	Cruise control	ON-102
R32 Skyline Early	No	Yes	Early steering sensor setup	ON-111
R32 Skyline Late	No	Yes	Late steering sensor setup	ON-112
R32 Skyline GT-R Early	No	No	HICAS	ON-110
R32 Skyline GT-R Late	No	No	HICAS	ON-115
R33 Skyline	No	No	No HICAS	ON-175
R33 Skyline	No	No	HICAS	ON-177
R33 Skyline	No	Yes	Cruise control	ON-208
R33 Skyline GT-R Early	Yes	No	Driver airbag	ON-203
R33 Skyline GT-R Middle and Late	Yes	No	Dual airbag models	ON-204
R34 Skyline	Varies	Varies	Automatic and non GT-R applications vary by trim	ON-229
R34 Skyline GT-R	Yes	No	Dual airbag	ON-228

Early Versus Late R32 GT-R Steering Boss Fitment

The R32 GT-R is the car where people most often run into trouble. Many owners assume that all R32 GT-R steering bosses are the same. They are not.

Early and late R32 GT-Rs can require different bosses because of the HICAS steering angle sensor arrangement. If the boss does not match the car, the wheel can physically bolt on, but the HICAS system may not read the steering position correctly.

Before ordering a boss for an R32 GT-R, confirm whether the car is early or late production and check the existing steering wheel, clock spring, horn contact, and HICAS related parts. If the car has been modified before, do not assume the parts on the car are original.

Common Symptoms of the Wrong Boss Kit

Here are some signs that the steering wheel boss or steering wheel position may be wrong:

• HICAS light comes on after a few minutes of driving
• Steering wheel is not centered when the car drives straight
• Turn signals do not cancel correctly
• Horn does not work
• Airbag warning light stays on after installation
• Steering angle sensor appears offset
• Aftermarket wheel sits too close or too far from the driver

Some of these problems can be caused by other issues, but the boss kit and steering wheel position are good places to start, especially if the problem appeared right after a steering wheel change.

Can You Make the Wrong Boss Work?

With enough modification, almost anything can be made to fit almost anything. That does not mean it is the right way to do it.

Using the wrong steering boss can create compromises with horn function, turn signal cancel, steering wheel position, airbag warning lights, HICAS operation, and safety equipment. For a clean installation, start with the correct boss for the exact car.

Buying a Legal Nissan Skyline GT-R in the United States

At Toprank Importers, we deal with R32, R33, and R34 Skyline GT-Rs every day. These cars are old enough now that many have been modified, restored, repaired, or changed several times over their lives in Japan and the United States. Small details like the correct steering wheel boss, HICAS compatibility, airbag equipment, and interior parts matter when you are trying to buy the right car or keep one sorted.

If you are looking for a US legal Nissan Skyline GT-R, we may already have what you are looking for in stock, in the United States.

View current inventory here: Toprank Importers Inventory