Steering Wheel Swap - SRT Wheel to JK - Jeep Garage - Jeep Forum

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  #1  
Old 09-16-2014, 01:03 PM
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Steering Wheel Swap - SRT Wheel to JK

I'm beginning a swap of the SRT type wheel to my 2014 JK. I should probably address the "why?" question upfront. The wheel looks sporty and comfortable - a nice bonus. But I'm really after the paddle shifters for the auto trans. I've always driven manual trans vehicles and can't stand the shifting on this auto. I've been using the console shifter full time, but thought the paddles would be nice to have as well.

The particular wheel I picked up is from a 2014 Challenger 100th Anniversary model. From what I've gathered, the splines are not the same size. I haven't figured out what to do about that. From pictures, it looks like the spline receptacle on the wheel is pressed in. If that's the case, maybe I could press out the receptacle from my wheel and press it into the new wheel.

Another issue is wiring. I don't know if there are any spare wires in the JK clock spring to pass the paddle shifter signal. Also, I believe the connectors for the cruise control, evic, radio, etc are not the same between the two wheels. So I need to figure out the wiring.

Does anyone have access to wiring diagrams of the steering wheel/horn area/clock spring for these two vehicles? (2014 Challenger 100th Anniversary edition, 2014 JK Unlimited)

I'll post back with progress for anyone that's interested. Don't have the new wheel in hand yet.

Thanks,
Dom


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  #2  
Old 09-19-2014, 08:57 PM
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Re: Steering Wheel Swap - SRT Wheel to JK

Interesting. Subscribed.
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Old 10-02-2014, 12:18 PM
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Re: Steering Wheel Swap - SRT Wheel to JK

I had a chance to pull the Jeep wheel and try out the SRT wheel. The
pin-out of the 6 pin connector (clock spring) is as follows:

Wrangler (connector PN 638100-1):
1 Ground
2 LIN Bus
3 Fused B(+)
4 S/C Signal 2
5 S/C Switch Ground
6 S/C Signal 1

SRT (connector PN 1419158-1):
1 LIN Bus
2 Fused B(+)
3 Ground
4 S/C Signal 2
5 S/C Switch Ground
6 S/C Signal 1

You can see a few wires that need to be swapped. I replaced the SRT
connector with the Wrangler connector and swapped wires around. All the
SRT wheel buttons function properly except the paddle shifters. The paddle
shifter signals are carried on the LIN bus to the cluster module. The
airbag swaps over fine.

Here's the pin-out of the shifter assembly:
1 IGNITION OFF/RUN/START CONTROL OUTPUT
2 GROUND
3 BRAKE LAMP SWITCH OUTPUT
4 NO CONNECT
5 CAN C (+)
6 CAN C (-)

That leads me to believe the autostick signals are carried on the CAN-C
bus. So the missing link is to intercept and decipher the LIN bus signal
from the paddle shifter and inject a corresponding signal onto the CAN-C
bus. This seems doable but will require a custom circuit board. It's a
bit beyond my skill set; any electrical engineers out there? The good
thing is this can all be done in the dash since the LIN bus signal is
carried through the clock spring.

Next challenge, the spline size mismatch. The Wrangler steering wheel hub
really looks like the splines are a pressed in bushing. I'm going to rig
something up and try to press it out.

Lastly, the SRT wheel has a heating element. I'm not about to tackle that
one.

By the way, in case anyone doesn't know, connector pin-outs are available
here:
http://connectors.dcctools.com/home.htm


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Old 10-08-2014, 11:42 AM
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Re: Steering Wheel Swap - SRT Wheel to JK

A little more progress on this. The steering wheels are made of magnesium and the splines are pressed in. Instead of destroying my stock wheel, I found a Grant steering wheel adapter that fits the Wrangler steering shaft (11/16-36 spline). Part number is 3162:



I'll grind down the backside of the SRT wheel so that it's flat and mount this adapter to it. On the opposite side of that adapter is a 6 hole threaded pattern. I can probably fit 4 clearance holes on the SRT wheel.

Here's a shot of the wheel in the Jeep. Now I see the black doesn't quite match. Not mounted, just resting on the steering shaft:



I found that the paddle shifters are a momentary switch, normally open. They are wired to the cruise control module, which then puts the signal on the LIN bus. So I plan to tap into the wires before the cruise control module. This way, something like this should work, the 05-07 version:

Paddle Shifter (Introduction) - LXCS* TRS300

I plan to test this hard wired before ordering one.
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Old 10-08-2014, 11:56 AM
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Re: Steering Wheel Swap - SRT Wheel to JK

Honestly when I first read your post I was skeptical, but now this actually seems pretty cool. Good job and good luck figuring it all out.
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Old 10-08-2014, 01:03 PM
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Re: Steering Wheel Swap - SRT Wheel to JK

Quote:
Originally Posted by domrvt View Post

I found that the paddle shifters are a momentary switch, normally open. They are wired to the cruise control module, which then puts the signal on the LIN bus. So I plan to tap into the wires before the cruise control module. This way, something like this should work, the 05-07 version:

Paddle Shifter (Introduction) - LXCS* TRS300

I plan to test this hard wired before ordering one.
Even if you manage to get the Paddle Shifters to put a command onto the "LIN bus", what makes you think the auto trans will see and execute those commands?
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Old 10-08-2014, 02:01 PM
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Re: Steering Wheel Swap - SRT Wheel to JK

Quote:
Originally Posted by WaltA View Post
Even if you manage to get the Paddle Shifters to put a command onto the "LIN bus", what makes you think the auto trans will see and execute those commands?
See my previous post regarding LIN to CAN.

However, I'm going the simpler route and using a wireless transmitter/receiver to send the momentary switch signal: Paddle Shifter (Introduction) - LXCS* TRS300
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Old 10-08-2014, 03:47 PM
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Re: Steering Wheel Swap - SRT Wheel to JK

Quote:
Originally Posted by racecarbmw View Post
honestly when i first read your post i was skeptical, but now this actually seems pretty cool. Good job and good luck figuring it all out.

+1 :d
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Old 10-08-2014, 08:09 PM
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More power to you man. Can't wait to see more updates.
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Old 07-26-2015, 11:33 PM
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Re: Steering Wheel Swap - SRT Wheel to JK

Sorry for the long delay. Finally got the wheel mounted with that adapter. I swapped the front face wheel buttons from the original wheel. Next up - wireless paddle shifters.

ImageUploadedByJeepGarage1437967958.118899.jpg


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Old 07-23-2016, 12:32 AM
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Re: Steering Wheel Swap - SRT Wheel to JK

Any update? Where did you get the new spline to fit it?
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Old 11-20-2016, 02:46 AM
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Re: Steering Wheel Swap - SRT Wheel to JK

Quote:
Originally Posted by domrvt View Post
Lastly, the SRT wheel has a heating element. I'm not about to tackle that one.
That would be my main motivator for trying something like this. After driving the Cherokee Trail Hawk for a couple weeks while my jeep was getting a new engine (warranty), I fell in love with the heated steering wheel - and that was in the fall. Now that it's winter with sub zero temps for the next 4+ months... I would love to find a way to make that happen.

Following this and hoping it works out for you.
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