***WARNING: LOTS OF PICS***
Hey all,
I've used BFc for many "how-to's" and DIY's...but there isn't a single decent post on installing an aftermarket wheel into a Z3 that has the 2-stage airbags. Soooooo, here it is!!!
First, Here is a look at what I had:
Sparco Ring Wheel 330mm w/horn button
Momo Steering Hub #2008 w/ adaptor ring (you will not need the adaptor ring)
2 x 3 Ohm 1/2 Watt splice-in resistors (can return everything to stock in not time)
2 x splice connectors and 12" of 18 gauge wire (to get the horn working with the MOMO Hub)
Carbon Pin for the horn - Part #: 32311158475 (not pictured yet)
And the tools I used (plus an exacto knife that is not pictured).
Phillips Head Screwdriver
Flat Head Screwdriver
3/8 inch ratchet
6 inch extension
16mm bit
TORX 30 bit
Flex Joint
Allen Key supplied with MOMO Adaptor
Exacto Knife
Now, let's get started. Begin by disconnecting your battery's negative terminal. You can disconnect it at the post, or at the vehicle ground. I disconnected mine at the vehicle ground (see pic), and kept it away from everything with a small piece of wood. Make sure you keep it away from anything. We will not be reconnecting the battery until we're done with the entire install.
Let the car sit for a few minutes, so that the electronics can fully discharge. BMW says this only takes about 10-20 seconds, but I let my car sit for a good 10 minutes.
Lock the steering wheel with the wheels as straight as possible, and the steering wheel straight.
After the car has had sufficient time to decharge, use a phillips head screwdriver to remove the screw that holds the lower part of the steering column cover on. The screw is located under the steering column cover.
Remove the cover by pulling downwards, and pushing in on the sides to release the locking pins. It should just pop right off.
Look under the steering wheel, and locate where the steering wheel connections meet the wiring harness on the column. Unclip the steering wheel connections by pressing the tab (see pictures below) and pulling it free. The wiring you see here is the airbag and the horn wiring.
The junction clip where the steering wheel connections and the steering column wiring meet is removable. Simply rotate the clip 45 degrees and pull down. Now you'll have easy access to the airbag wiring later.
In the pics below, you can see the wiring for the airbag and horn that was clipped onto the underside of the steering column. On the back side of the clip, you'll see numbers corresponding to each wire. The wires are as follows:
1. Yellow w/black stripe: Stage 1 Airbag
2. Yellow w/brown stripe: Stage 1 Airbag
3. Grey w/black stripe: Stage 2 Airbag
4. Grey w/brown stripe: Stage 2 Airbag
5. Brown w/red stripe: Horn
6. Brown: Horn
We're going to be bridging the two yellow wires with each other, and the two grey wires with each other. We'll bridge them using the 3 Ohm .5 Watt resitors. The brown wires do not need a resistor...one of them will be connected to the Carbon Horn Pin later.
Separate the two yellow wires and install the splice-in clips. I used the Exacto knife here to remove a little of the wiring insulation, in order to guarantee good contact. Don't worry about the black stuff on the wires in the pics...it's just adhesive from the fabric tape, not burnt wires.
Now bridge the splice-in clips with the resistor.
Next, separate the Grey wires and repeat the same process as above. Install the splice-in clips, bridge the clips with the second resistor.
Now fit the resistors up into the steering column along with the rest of the wiring. Make sure it's nice and tucked away.
Next we're going to remove the airbag and steering wheel.
Start by locating the two Torx screws on the backside of the steering wheel. Remove them using the Torx 30 bit.
Once you've released the Torx screws holding the airbag in, gently pull it out of the steering wheel. You will have to disconnect it at the junction found inside the steering wheel.
Once you have the airbag removed, place it somewhere face up and do NOT put anything on top of it.
Now locate the 16mm bolt that holds the steering wheel to the steering shaft. Remove the bolt using the 16mm bit and an extension. It will require quite a bit of force, but it should come off no problem. You may need a breaker bar for extra leverage.
Now that the steering shaft is exposed, mark the Top Dead Center (TDC) point on the face of the steering shaft. This should be the point that represents the top center of the steering wheel.
Remove the OEM steering wheel and place it aside.
At this point, we're going to install the Carbon Horn Pin. Simply insert it into the cradle hole located just below the steering shaft (see pic below).
Route the wiring back and towards the yellow, gray, and brown wires that we worked on before. Using a splice clip, splice the Brown w/red wire and the wire from the Carbon Horn Pin together. If the wire from the Carbon Horn Pin isn't long enough, this is where the extra 18 gauge wire and second splice clip will come in. Basically, we're splicing the Carbon Horn Pin wire to the Brown w/red wire on the car's wiring harness.
PICS TO FOLLOW
Now take your MOMO Steering Hub, and install it. Make sure that the orientation of the Hub is correct. There is a marking on the Hub to help with the orientation, and the hole next to it represents the top center of the steering wheel.
Replace the 16mm bolt to secure the Hub to the steering shaft, tighten only until it seats.
Now affix the Sparco steering wheel to the Hub using the 6 allen screws that came with the hub. Torque them down properly (torque values should be provided with the Hub).
Then torque down the 16mm bolt to firmly connect the Hub to the steering shaft. Torque values may vary slightly between Hub and OEM specs.
Next, connect the wires coming from the Hub to the horn button.
Replace the lower steering column cover, and insert the horn button into the steering wheel.
For the final step, reconnect your battery.
Voila! You have now completed the install of your new aftermarket steering wheel! If you did everything correctly, you're car won't have any airbag (SRS) lights or fault codes, and your horn will work when you press the button. If you have SRS lights, check the splices and/or resistors on the airbag wiring. If your horn isn't working, check the splicing on the horn wire.
All in all, this took me about an hour, including all of the stops to take pics. :D
If you have any questions, feel free to hit me up.
Hey all,
I've used BFc for many "how-to's" and DIY's...but there isn't a single decent post on installing an aftermarket wheel into a Z3 that has the 2-stage airbags. Soooooo, here it is!!!
First, Here is a look at what I had:
Sparco Ring Wheel 330mm w/horn button
Momo Steering Hub #2008 w/ adaptor ring (you will not need the adaptor ring)
2 x 3 Ohm 1/2 Watt splice-in resistors (can return everything to stock in not time)
2 x splice connectors and 12" of 18 gauge wire (to get the horn working with the MOMO Hub)
Carbon Pin for the horn - Part #: 32311158475 (not pictured yet)
And the tools I used (plus an exacto knife that is not pictured).
Phillips Head Screwdriver
Flat Head Screwdriver
3/8 inch ratchet
6 inch extension
16mm bit
TORX 30 bit
Flex Joint
Allen Key supplied with MOMO Adaptor
Exacto Knife
Now, let's get started. Begin by disconnecting your battery's negative terminal. You can disconnect it at the post, or at the vehicle ground. I disconnected mine at the vehicle ground (see pic), and kept it away from everything with a small piece of wood. Make sure you keep it away from anything. We will not be reconnecting the battery until we're done with the entire install.
Let the car sit for a few minutes, so that the electronics can fully discharge. BMW says this only takes about 10-20 seconds, but I let my car sit for a good 10 minutes.
Lock the steering wheel with the wheels as straight as possible, and the steering wheel straight.
After the car has had sufficient time to decharge, use a phillips head screwdriver to remove the screw that holds the lower part of the steering column cover on. The screw is located under the steering column cover.
Remove the cover by pulling downwards, and pushing in on the sides to release the locking pins. It should just pop right off.
Look under the steering wheel, and locate where the steering wheel connections meet the wiring harness on the column. Unclip the steering wheel connections by pressing the tab (see pictures below) and pulling it free. The wiring you see here is the airbag and the horn wiring.
The junction clip where the steering wheel connections and the steering column wiring meet is removable. Simply rotate the clip 45 degrees and pull down. Now you'll have easy access to the airbag wiring later.
In the pics below, you can see the wiring for the airbag and horn that was clipped onto the underside of the steering column. On the back side of the clip, you'll see numbers corresponding to each wire. The wires are as follows:
1. Yellow w/black stripe: Stage 1 Airbag
2. Yellow w/brown stripe: Stage 1 Airbag
3. Grey w/black stripe: Stage 2 Airbag
4. Grey w/brown stripe: Stage 2 Airbag
5. Brown w/red stripe: Horn
6. Brown: Horn
We're going to be bridging the two yellow wires with each other, and the two grey wires with each other. We'll bridge them using the 3 Ohm .5 Watt resitors. The brown wires do not need a resistor...one of them will be connected to the Carbon Horn Pin later.
Separate the two yellow wires and install the splice-in clips. I used the Exacto knife here to remove a little of the wiring insulation, in order to guarantee good contact. Don't worry about the black stuff on the wires in the pics...it's just adhesive from the fabric tape, not burnt wires.
Now bridge the splice-in clips with the resistor.
Next, separate the Grey wires and repeat the same process as above. Install the splice-in clips, bridge the clips with the second resistor.
Now fit the resistors up into the steering column along with the rest of the wiring. Make sure it's nice and tucked away.
Next we're going to remove the airbag and steering wheel.
Start by locating the two Torx screws on the backside of the steering wheel. Remove them using the Torx 30 bit.
Once you've released the Torx screws holding the airbag in, gently pull it out of the steering wheel. You will have to disconnect it at the junction found inside the steering wheel.
Once you have the airbag removed, place it somewhere face up and do NOT put anything on top of it.
Now locate the 16mm bolt that holds the steering wheel to the steering shaft. Remove the bolt using the 16mm bit and an extension. It will require quite a bit of force, but it should come off no problem. You may need a breaker bar for extra leverage.
Now that the steering shaft is exposed, mark the Top Dead Center (TDC) point on the face of the steering shaft. This should be the point that represents the top center of the steering wheel.
Remove the OEM steering wheel and place it aside.
At this point, we're going to install the Carbon Horn Pin. Simply insert it into the cradle hole located just below the steering shaft (see pic below).
Route the wiring back and towards the yellow, gray, and brown wires that we worked on before. Using a splice clip, splice the Brown w/red wire and the wire from the Carbon Horn Pin together. If the wire from the Carbon Horn Pin isn't long enough, this is where the extra 18 gauge wire and second splice clip will come in. Basically, we're splicing the Carbon Horn Pin wire to the Brown w/red wire on the car's wiring harness.
PICS TO FOLLOW
Now take your MOMO Steering Hub, and install it. Make sure that the orientation of the Hub is correct. There is a marking on the Hub to help with the orientation, and the hole next to it represents the top center of the steering wheel.
Replace the 16mm bolt to secure the Hub to the steering shaft, tighten only until it seats.
Now affix the Sparco steering wheel to the Hub using the 6 allen screws that came with the hub. Torque them down properly (torque values should be provided with the Hub).
Then torque down the 16mm bolt to firmly connect the Hub to the steering shaft. Torque values may vary slightly between Hub and OEM specs.
Next, connect the wires coming from the Hub to the horn button.
Replace the lower steering column cover, and insert the horn button into the steering wheel.
For the final step, reconnect your battery.
Voila! You have now completed the install of your new aftermarket steering wheel! If you did everything correctly, you're car won't have any airbag (SRS) lights or fault codes, and your horn will work when you press the button. If you have SRS lights, check the splices and/or resistors on the airbag wiring. If your horn isn't working, check the splicing on the horn wire.
All in all, this took me about an hour, including all of the stops to take pics. :D
If you have any questions, feel free to hit me up.
The most in-depth Z3 Sparco Steering Wheel Install
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