Being a pretty new TJ owner (bought it last fall) I am looking for things to do to make it more fun and convenient to drive. After being inspired by Youngblood’s thread “Junkyard Cruise Control Install for Every TJ”, I decided to tackle this on my ’01 four banger. After re-reading the thread, and checking my Jeep, I quickly determined that mine wasn’t prewired, so it was time to start looking for what I needed. I hopped online, and through some digging was able to find both the parts diagrams and service manual (free!) for an ’01 Wrangler. So far…………..so good.
If you would like a copy of the parts and service manuals, PM me.
Now to determine and gather what parts are needed:
What I decided to do was install each part as I got it, which was nice because I was able to work on it for a little time each night, and drive it to work the next day, because this is my DD.
Since the cruise switches are resistance based, it was important to get the right switches for my little ’01. Some shopping on Ebay proved just the ticket! I found that these switches are shared with at least the TJ and XJ for ‘99 through ’01. I was lucky enough to find both switches and the wires being sold as a package! (Cha-Ching! $25 bucks down).
They were very easy to install, just remember to disconnect the negative on your battery, and give it 10 min for the airbag capacitor to discharge, unless you want to get an airbag in your face while playing with the steering wheel.
I could not find a P/N for the overlay harness, and I certainly wasn’t going to pay Jeepsareus $300+ bucks for some wires!!! So I decided to make my own, more on that later………..
(Pic of Jeepsareus Harness)
Next came the servo assembly. Chrysler uses the same servo for many models and years, so this should be easy……right? I started off by looking for the right P/N’s, so ‘off to the boneyard’!!! I wasn’t so lucky finding those. But I did find an ’05 Rubi that some poor guy rolled. It was already pretty well stripped out, but low and behold……….under what was left of the hood was the servo assembly with the cables and connector! I unbolted it, clipped the wires to grab the servo wiring connector, being careful to leave myself plenty of wire to splice into. I also took its vacuum lines with tee and the servo mounting bracket, hoping that I would be able to use it. While I was in there I went over to the ECU and clipped off one of the connectors, knowing from Youngblood that I would need some of the pins for my homemade overlay harness. (Cha Ching! $35 bucks down). I then headed home to see how I could get this thing in there. I was easier than I thought. The throttle cabling hooked right up, and found the tee to attach the vacuum line (looking in the service manual helped). Next came the bracket. It would have been nice to have the correct mounting bracket. But what I did was cut the two outside legs off the one from the ’05 Rubi and mounted it as shown in the pic. No Problem………………………………..
Next came what I knew would be the biggie………the clockspring. I did check before I went shopping to see if I already had one in my steering column………..no such luck! Being the cheap schmuck that I am, I’m going to look for a deal. The P/N that I need was only used in ’00 & ’01 Wranglers, making it very hard to find on the cheap. So I researched the pinouts in my service manual and compared it to other year jeeps. I found that the one I needed, P/N ~ 56047105AB, and the one out of an XJ, P/N ~ 56009071, looked the same……………pinouts were the same………….connectors were the same. So they are the same……..right? I decided to take a gamble, hopped on Ebay and found one for sale for $75. Great Deal! Then the day came to install it. I disconnected the battery, centered and pulled the steering wheel, and dug in to get my old clockspring out. No problem! Until I went to put the new one in. The connectors all fit fine, but the center hole for the steering shaft was too small!! Lesson learned……...Get the right one dummy!! I was able to return the XJ one, and the cheapest ‘right’ one I could find was on Morris 4X4 (Cha-Ching! $135 bucks down)
Well………….now that I was waiting for the new clockspring to come in, might as well tackle the overlay harness. This took some planning.
So back to the schematics. I traced all of the wiring and pinouts and came up with the pic below.
So now I had a plan. I went to my Jeep and took some measurements to figure out how long the harness needs to be and layed it out on the kitchen table. I figured that the distance between the Servo Plug and the ECU pins needed to be 53”. So I Layed it out, soldered and shrink tubed the connections, and wrapped it. I left plenty of extra wire to go inside the firewall…………
Cha-Ching! $10 bucks down for wire and wrap! Now came the time to lay it in the Jeep.
Wiring it in was a bit more of a challenge. It was a good thing that I grabbed that entire ECU plug off of the Rubi, because I was able to practice taking it apart and plugging the pins into it. I broke it learning the “right” way to disassemble it and put the pins in. By the time I got to the one on my Jeep, I was an expert at pulling it apart, drilling out the plugs on the strain relief, sliding the little pin retainer over, inserting the pin, and putting it all back together!
The rest of the wiring wasn’t too bad. Chrysler was kind enough to put ‘some’ of the wires into their standard harness. The ones leading from the clockspring connector to backside of connector C108 were there. But nothing on the blue plug side. If I was to do this again, I would grab some pins from the donor Jeep to plug into the connector. But since I didn’t have those, I bypassed C108 and just ran up the steering column and spliced into the clockspring connector. I did the same with the brake switch (bypassing C107). See the marked up schematic below. The sensor gound was a challenge. I tried getting into C103, but the wire colors and positions weren’t right. Not sure what happened at the factory there……………. So I just gave pin 3 on the clockspring its own ground on the firewall. Pin 4 on the Servo connector was easy. I just added another ground to the ribbon ground on the center of the firewall. Look at the pics below for the Overlay Tee running into the plug in the firewall above the clutch housing, and the Overlay Harness tied into the ECU. (Note: the relays mounted on either side of the ECU are for my bumper mounted fog and windshield mounted off-road lights)
All that is left to do is install the new clockspring. Just have to repeat what I did earlier when I tried to mount the one from the XJ. That’s due in today, so when I mount it I’ll post to let you know if it all worked out.
Total cost $205. Probably could have done it for the $140 that Youngblood thought if it wasn’t for the clockspring. But at least I have a new one! Thanks again Youngblood for your help!!!!!!!!!
Got the clockspring in the mail yesterday.....plugged it in and........no.......didn't work. so then I started retracing the wiring. I found that Chrysler had changed wire colors for the sensor ground. So I took the cruise sensor ground off of the firewall and spliced it into wire 8 on C103, which was BLK/BL instead of BR/YL. BINGO! I now have cruise. I hope this will help anybody trying to add cruise to their '01
Sorry, I can't tell you the resistance, I can't find out either. I ended up trading the '01 in for the '08 in my avatar a little while ago. I had figured my best bet was to work off the part numbers I had gathered.
Now.....2008 JK X