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I purchased a low milage 2012 XKR about a month ago. So far, I'm pretty happy with it.
One problem I have come across is that the cruise control is not working. When the car starts up, I see "Cruise Control Not Available". I scanned the OBD codes, and the only code that comes up is "U0104" (cruise control module communication lost).
Any thoughts on how I might diagnose / repair this?
Anyone know where the Cruise Control Module is located on a 2012 XK(R)?
I would do a hard reboot and see if the communications work once it powers back up. Unhook the battery, hold the cables together for 30 second and hook it back up.
Also make sure the battery is FULLY charged. Fully. Like, on a 20 amp charger for 24 hours.
What type of Cruise is it? By the symptom it would seem ACC, or Adaptive Cruise Control, and that the forward sensor isn't working or is dirty.
OP, do you have the ACC or Normal Cruise?
Are there TWO rotary controls on the right spoke of the steering wheel, or only one?
I would do a hard reboot and see if the communications work once it powers back up. Unhook the battery, hold the cables together for 30 second and hook it back up.
I tried that. (Had to look around a bit to find the battery.) Didn't help. Still the same warning on the dash when I start the car. ("Cruise not available") Also same OBD code (U0104) even after I cleared all codes.
Also make sure the battery is FULLY charged. Fully. Like, on a 20 amp charger for 24 hours.
What type of Cruise is it? By the symptom it would seem ACC, or Adaptive Cruise Control, and that the forward sensor isn't working or is dirty.
OP, do you have the ACC or Normal Cruise?
Are there TWO rotary controls on the right spoke of the steering wheel, or only one?
Yes. Owners manual says "Adaptive Cruise Control". I have only 1 rotary control on the right side of the steering wheel.
Yes. Owners manual says "Adaptive Cruise Control". I have only 1 rotary control on the right side of the steering wheel.
You don't have Adaptive if you only have one rotary. You have the "Normal" cruise. No sensors. You'll probably need the module reflashed, or a new module. OR, have you checked all the fuses and such?
You don't have Adaptive if you only have one rotary. You have the "Normal" cruise. No sensors. You'll probably need the module reflashed, or a new module. OR, have you checked all the fuses and such?
Ok. Any idea where the Cruise Control fuse is on a 2012 XK(R)? As I mentioned, I've only had it for a month, and I'm still trying to learn where everything is, and how to work all the accessories.
Adaptive speed Control sensor is fed from fuse 15 in the engine bay.
There is currently no fuse in slot 15 in the engine bay fuse pannel, and the owners manual for my car (2012 XKR) lists that slot as "unused". I'm happy to try putting a fuse in it, but what amperage fuse should I use?
Looking at the Electrical guide, it looks like the regular cruise control (speed control) is done in the ECM. No special module for cruise control. At a glance, it doesn't look like there is one specific fuse but I looked for about 2 minutes. Send me a direct message with you're email address and I'll send you the Electrical Guide
I think it's called the speed control module and it is located under the steering wheel. I think the fuse location is in the owners manual.
From what I can see in the service manuals, the speed control module is only present when Adaptive Cruise is available. It's labeled Adaptive Speed Control in the manuals so that makes it unclear to the layman if it is indeed for regular cruise.....
Also, the U0104 code has a 6 different failures associated with it, each marked with a -xx suffix. Probably need a better scan tool to narrow it down.
Ah.... one thing though....... if there is a fault with your brake pedal switch or stop lamps/wiring, the cruise may not be able to engage. I'm just throwing that out there as an Ole Guy Memory. from previous vehicles.
I have ACC on my 2010 XKR and I've had the No Cruise Control Available warning ever since I added a tune to the ECM about 5 years ago. Since I have never used cruise control of any kind, it never bothered me. I figured that it was related to the resetting of the top speed with the tune, no longer being restricted, but it may have just been coincidence. If you find the solution, I'd be interested in trying on mine as well.
Ah.... one thing though....... if there is a fault with your brake pedal switch or stop lamps/wiring, the cruise may not be able to engage. I'm just throwing that out there as an Ole Guy Memory. from previous vehicles.
That's from the X100's. The brake light switch has two microswitches in it, one for the brake lights and one to disable the cruise control. Truly a PIA to replace too.
Cruise control malfunction
