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Old 07-30-2019, 09:35 PM
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Ac must be turned on every time I start it up

Every time I start my 13jkur I have to turn on the ac manually,it then works great,but won’t stay on after shutting it down,anyone have this problem

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Old 07-30-2019, 09:36 PM   #2
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Old 07-31-2019, 10:38 AM   #3
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Every time I start my 13jkur I have to turn on the ac manually,it then works great,but wont stay on after shutting it down,anyone have this problem
Hi Donlittle0003,

I certainly understand why this would be concerning. If youre not able to determine the cause based on advice provided here, I kindly recommend connecting with your local Jeep dealer. Our team is available via private message if you are in need of any assistance with that process.

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Old 07-31-2019, 08:05 PM   #4
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It is really hard to push that button the torment the pain .
Mine does the same thing never thought about it to busy to think about it .
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Old 07-31-2019, 11:58 PM   #5
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My '08 does the same thing. Seems to be normal operation for JK's.
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Old 08-01-2019, 06:21 AM   #6
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My '08 does the same thing. Seems to be normal operation for JK's.
Actually it's not normal. What is happening is that the control head is losing memory. Often times when this happens you get a flashing defroster light on startup which is telling you the head is calibrating. Once calibrated you can set your controls the way you want. On occasion this can happen without the flashing def light. It's a simple matter to replace the control head.
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Old 08-01-2019, 01:30 PM   #7
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I shut everything off when I shut down the motor anyways, so I never thought much about it... but since you mention it, if I'm just running into the corner store I'll leave all accessories on... seems if I'm more than a couple minutes the a/c is off when I return... the blower is still on, but the a/c is off.
Pushing the button seems easier than replacing a control head (whatever that is) so I'll leave it the way it is.
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Old 08-01-2019, 07:09 PM   #8
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I don't get any flashing def light, never has, & it has been like this as long as I have had the JK. It was 2nd hand when I got it in 2010.
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Old 10-04-2019, 06:20 PM   #9
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Actually it's not normal. What is happening is that the control head is losing memory. Often times when this happens you get a flashing defroster light on startup which is telling you the head is calibrating. Once calibrated you can set your controls the way you want. On occasion this can happen without the flashing def light. It's a simple matter to replace the control head.
Do you have a part number to replace? Does it require a dealer re-calibration?
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Old 10-05-2019, 07:16 AM   #10
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Do you have a part number to replace? Does it require a dealer re-calibration?
Do yourself a favor and pull the original out far enough to read the number on the back of the panel so you can replace it with the same. Very simple and easy to do. Youtube if you need help. You can look up which one you need by description as to whether or not you have rear defrost, ATC, etc. Be advised the last 2 letters may be different due to manufacturing updates as in *******AA or *******AC and so on. AA would be the original part and AC the more recent update. You don't want something older than what you have.

BTW no need for dealer involvement. When you activate it for the first time it will auto-calibrate. The DEF light will flash for a few moments until calibration is complete and then not flash again on startup.
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Old 10-06-2019, 09:48 PM   #11
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Do yourself a favor and pull the original out far enough to read the number on the back of the panel so you can replace it with the same. Very simple and easy to do. Youtube if you need help. You can look up which one you need by description as to whether or not you have rear defrost, ATC, etc. Be advised the last 2 letters may be different due to manufacturing updates as in *******AA or *******AC and so on. AA would be the original part and AC the more recent update. You don't want something older than what you have.

BTW no need for dealer involvement. When you activate it for the first time it will auto-calibrate. The DEF light will flash for a few moments until calibration is complete and then not flash again on startup.
AI.....that should be the latest iteration....I just ordered my head unit as mine is starting to go the way of the Red October, flickering light on the position setting, and loosing calibration every time i turn the Jeep off for more then a minute or so....Ordered this one (this is for my Base JK with out AC)


Oh this only cost me $61 with shipping...
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Old 10-07-2019, 08:57 AM   #12
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I started having this issue last week, and ordered the part from: moparfactoryparts.com
Part number for me was: 68197433AB but cost $166.50 The part came in this past weekend and I pulled the dash and installed, and same issue.

However now that I am writing this and reading more, I think I need to try it again. I installed it and turned the Jeep on, and as soon as I saw it not working turned it off. I am thinking I might not have let it fully calibrate before removing it.

Taking the dash apart is a 5 min job and very simple to do. Will test again this evening before I go about returning the part.

If it doesn't fix it I can live with it for now as its only a 15 second delay before I have to manually kick the air on. I could see this getting annoying if I had auto-start to warm/cool the Jeep as it would never work.

Ken~
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Old 10-07-2019, 06:36 PM   #13
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I started having this issue last week, and ordered the part from: moparfactoryparts.com
Part number for me was: 68197433AB but cost $166.50 The part came in this past weekend and I pulled the dash and installed, and same issue.

However now that I am writing this and reading more, I think I need to try it again. I installed it and turned the Jeep on, and as soon as I saw it not working turned it off. I am thinking I might not have let it fully calibrate before removing it.

Taking the dash apart is a 5 min job and very simple to do. Will test again this evening before I go about returning the part.

If it doesn't fix it I can live with it for now as its only a 15 second delay before I have to manually kick the air on. I could see this getting annoying if I had auto-start to warm/cool the Jeep as it would never work.

Ken~
Ken, there are a number of different things that can cause the flashing DEF light on startup but the most prevalent are the control panel and the blend air door module but it is easy to determine which is your present issue. All else aside, when installing a new panel you must allow time enough for the panel to calibrate and the system to come to life.
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Old 10-07-2019, 06:58 PM   #14
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Check fuses F13 and M11


They feed constant battery voltage to the heater controller. I would imagine that constant power is for the memory.


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Old 10-08-2019, 02:08 PM   #15
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I did put the control panel back in and let it go through its motions. I could hear it turning the blend air door module. Once it was done, I turned the air on and it that worked. I then turned the Jeep off, opened the door and closed the door, started the Jeep and the flashing DEF light was still there I let it do its thing again, and it goes back flashing light each time the Jeep is restarted.

I did verify the serial number and it matches, so its no the control panel.

Have not checked the fuses, but will do that when I am back in town later this week. Maybe I will get lucky and the fuse will fix it.

Ken~
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Old 10-09-2019, 08:34 AM   #16
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Your next step will be to visually check the motors. Yes motors, since there are 2. One is just above and to the right of the accelerator pedal and very hard to see and the other is behind the glove box. When they are cycling for calibration they must be able to run stop to stop smoothly with out any glitches or tics in between. Any lag or jump will signal the system of a fault and cause your problem.

I said next step but this should have been your first step before replacing the panel.
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Old 10-09-2019, 04:22 PM   #17
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Woot Woot love easy fixes. Turns out it was the fuse Replaced it and then let the system cycle through. I am able to hear both motors working. Turned Jeep off and back on, and the setting stayed.

Any chance there is a fuse for seat belt? I have the light on, as I disabled the chime via jscan app. I replaced the buckle already, but still have the light that stays on. I have a post about it as well.

Ken~
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Old 10-09-2019, 04:47 PM   #18
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Woot Woot love easy fixes. Turns out it was the fuse Replaced it and then let the system cycle through. I am able to hear both motors working. Turned Jeep off and back on, and the setting stayed.

Any chance there is a fuse for seat belt? I have the light on, as I disabled the chime via jscan app. I replaced the buckle already, but still have the light that stays on. I have a post about it as well.

Ken~
what fuse did you mess with? I suspect my HVAC unit is faulty (due to the flickering light) but hey I might as well try any thing especially something as easy as a fuse....
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Old 10-11-2019, 06:29 AM   #19
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Pop the hood and on the passenger side you will see the fuse box. 2 little tabs you push in and pull up. On the inside of the fuse box is a diagram of all the fuses with a number. Look for the M11 fuse. Should be towards the rear of the Jeep almost straight down from the fuse puller.

I had to pull the fuse to see if it was blown and it was. Popped a new 10a in and let the Control Board cycle through. Turned Jeep off/on and it kept its settings.

Ken~
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Old 10-11-2019, 08:54 AM   #20
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I will give that a try, mine still cycles but it could be possible, thanks!
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Old 10-11-2019, 10:26 AM   #21
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Let me know if you need a Control Box. Its not worth me sending back cause of restocking fee, so can send it your way for cheaper. Mine was for my 16' JKU with non auto AC, but rear defrost.

Ken~
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Old 10-11-2019, 04:20 PM   #22
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Let me know if you need a Control Box. Its not worth me sending back cause of restocking fee, so can send it your way for cheaper. Mine was for my 16' JKU with non auto AC, but rear defrost.

Ken~
Thanks for the offer, I don’t have a hardtop (no defrost button on mine) I also ordered a replacement unit before you mentioned the offer
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Old 10-25-2019, 03:50 PM   #23
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Glad I ran across this thread. The controller in my Jeep (2013) never worked properly. Would effectively reset, taking anywhere from 5-15 seconds every time. An annoying PITA, especially in summers in GA and FL.

I took Jeep in to the dealer I purchased and was told that someinterior LED lights I had installed were the culprit and that they wouldn't look at it further until those were removed. I knew that was BS, but it wasn't worth dealing with. A few months later I took it to another dealer who told me that this was normal and expected behavior. That the system was basically on an internal delay during startup so that it wouldn't place an extreme load on the electrical system and would prolong overall life of electrical components. Sounded like some more BS, but at least a bit more creative than the first dealer, and I have read similar things on boards that stated similarly, so I took it as that and just chose to live with it.

After reading through this thread, I decided to take the gamble and ordered a replacement dash control module (after checking that the fuse was good). Swapped out the module and PROBLEM SOLVED!

So for the $120 shipped (I needed the unit with rear defrost and without auto temp control), I now know the truth of where the fault was and have it fixed. Anyone else having this problem, this is the culprit. Thanks to everyone who posted the fix.
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