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Old 08-17-2011, 08:10 PM   #1
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What's the deal with Hill Descent Control on a 2012?

The Owners Manual doesn't say anything regarding the Hill Descent Control button for an Auto Trans setup. I haven't seen the DVD yet. I've read things here and there on the net about its operation but still can't exactly figure it out. If I hit the button a green lamp that looks like a downhill grade flashes on the dash about 3 times. That's it.

Is it on a Hill Descent it can sense this and then I hit the button and it applies the brakes?

I'm confused!

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Old 08-17-2011, 08:15 PM   #2
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From what I understand (which may be wildly incorrect), it will only engage when you're on an 8% or greater incline and will only affect the downward direction of travel, effectively slowing your descent considerably so you don't need to ride the brakes all the way down.

Promo video for a GC:

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Old 08-17-2011, 08:16 PM   #3
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Old 08-17-2011, 08:20 PM   #4
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Originally Posted by ChasmCrawler View Post
The Owners Manual doesn't say anything regarding the Hill Descent Control button for an Auto Trans setup. I haven't seen the DVD yet. I've read things here and there on the net about its operation but still can't exactly figure it out. If I hit the button a green lamp that looks like a downhill grade flashes on the dash about 3 times. That's it.

Is it on a Hill Descent it can sense this and then I hit the button and it applies the brakes?

I'm confused!
If it's like the Land Rover version, it simply modulates the brakes to keep each wheel from sliding and to help keep the vehicle at a reasonable speed ...and, hopefully, keep you in a straight line. You still need to be in the lowest gear necessary for the particular off-road situation ... this is stating the obvious, but it doesn't magically increase the engine compression braking.

That said, again - I'm assuming it works like the Land Rover version.

If my JK would get here, I'd try it out too!!!

T
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Old 08-17-2011, 08:22 PM   #5
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Originally Posted by JK Simon View Post
so you don't need to ride the brakes all the way down.
... because it rides the brakes for you.

Seriously though, at least on the Land Rovers, it can be really rough on brakes. As much as I hate to admit it, there's no replacement for 1st gear, lo range in a manual.

but, I'd still rather have an auto in the rocks!

T
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Old 08-17-2011, 08:25 PM   #6
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Quote:
Originally Posted by ChasmCrawler View Post
The Owners Manual doesn't say anything regarding the Hill Descent Control button for an Auto Trans setup. I haven't seen the DVD yet. I've read things here and there on the net about its operation but still can't exactly figure it out. If I hit the button a green lamp that looks like a downhill grade flashes on the dash about 3 times. That's it.

Is it on a Hill Descent it can sense this and then I hit the button and it applies the brakes?

I'm confused!
If you haven't seen the DVD then you haven't seen the owners manual. You've seen the guide, but the full manual is on the DVD. You can also download it from Jeep.com.
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Old 08-17-2011, 08:25 PM   #7
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Originally Posted by JK Simon View Post
From what I understand (which may be wildly incorrect), it will only engage when you're on an 8% or greater incline and will only affect the downward direction of travel, effectively slowing your descent considerably so you don't need to ride the brakes all the way down.

Promo video for a GC:
OK, I get it now there must be a considerable downhill grade for the HDC to kick in. So, if I'm on a steep descent and press the button the light in the cluster will probably stay lite up instead of flashing, telling me Hill Descent is engaged.
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Old 08-17-2011, 08:28 PM   #8
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If you haven't seen the DVD then you haven't seen the owners manual. You've seen the guide, but the full manual is on the DVD. You can also download it from Jeep.com.
Thanks Daggo. The DVD is really that much better then the written manual? I'll have to check it out.

I felt the written manual lacked alot of info except when it came to the operation of the radios.

They even have a Euro Wrangler on the cover and reference the 3.8L for towing capacities.
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Old 08-17-2011, 08:31 PM   #9
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Originally Posted by ChasmCrawler View Post
Thanks Daggo. The DVD is really that much better then the written manual? I'll have to check it out.

I felt the written manual lacked alot of info except when it came to the operation of the radios.

They even have a Euro Wrangler on the cover and reference the 3.8L for towing capacities.
That written thing is not the manual. Think of it as the quick start guide. They haven't given out a printed manual since 2009.
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Old 08-17-2011, 08:31 PM   #10
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Originally Posted by Comac90 View Post
... because it rides the brakes for you.

Seriously though, at least on the Land Rovers, it can be really rough on brakes. As much as I hate to admit it, there's no replacement for 1st gear, lo range in a manual.

but, I'd still rather have an auto in the rocks!

T
4lo and 1st gear in the auto works, as well, although it doesn't have that awesome granny gear of the NSG370. I enjoyed the challenge of working a manual on the rocks and on inclines, but there is something to be said for the ease of the auto. I reluctantly ordred a JK auto to replace my TJ manual.
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Old 08-17-2011, 08:35 PM   #11
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Originally Posted by daggo66 View Post
That written thing is not the manual. Think of it as the quick start guide. They haven't given out a printed manual since 2009.
Quick start guide! You got that right!

It was kinda bare with the details regarding just about everything!

Next time I'm in my Jeep, I'll grab the DVD and watch it on my PC.
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Old 08-17-2011, 08:37 PM   #12
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My Jeep: Jeep Owners Service Manuals - 4x4 SUVs, Sports Utility Vehicles, Off Road

I just checked online. The 2012 manual isn't available to download yet.
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Old 08-17-2011, 08:38 PM   #13
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Originally Posted by off a cough View Post
4lo and 1st gear in the auto works, as well, although it doesn't have that awesome granny gear of the NSG370. I enjoyed the challenge of working a manual on the rocks and on inclines, but there is something to be said for the ease of the auto. I reluctantly ordred a JK auto to replace my TJ manual.
I wouldn't worry about your choice for an Auto. I love it and it's a tiptronic trans anyway so you can select to stay in gear 1, 2, 3, or 4.
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Old 08-17-2011, 08:40 PM   #14
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Originally Posted by daggo66 View Post
My Jeep: Jeep Owners Service Manuals - 4x4 SUVs, Sports Utility Vehicles, Off Road

I just checked online. The 2012 manual isn't available to download yet.
Thanks for the link anyway!

I'll just grab the DVD out of my glove box and watch it tomorrow on my lunch break or after work.
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Old 08-17-2011, 09:18 PM   #15
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It says in the guide or somewhere if you want the REAL printed owners manual, you can ask your sales person as I did and jeep will send you one. Or they give you a toll free number to call also. Took about 2 weeks and I got mine for my 11 model. Yet to use the DVD and I could play it in the jeep, but alot of new jeeps don't have luxury. I like the book version myself. Now if they threw in a iPad in the glovebox with the owners manual on it, like some chink car company just did, that would be cool!
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Old 08-17-2011, 09:22 PM   #16
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Originally Posted by off a cough View Post
4lo and 1st gear in the auto works, as well, although it doesn't have that awesome granny gear of the NSG370. I enjoyed the challenge of working a manual on the rocks and on inclines, but there is something to be said for the ease of the auto. I reluctantly ordred a JK auto to replace my TJ manual.
Yeah, i agree with you, it does work ... You just lose a bit of the 'compression' thru the torque converter making not as good as the manual. Of course, that same torque converter makes the rocks so much more fun - IMHO.

T
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Old 08-17-2011, 09:30 PM   #17
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And it's free, and it should be in every jeep, and you shouldn't have to to ask for it. Jeep is cheep! Hey I made that rhyme. But I love my SKIDBAR.
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Old 08-18-2011, 12:07 AM   #18
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My printed 2012 Owner's Manual came by UPS today. It's more than 600 pages! But, it'll still be easier to use than the stupid DVD. Sheesh, what a botched job!

Here's a copy & paste from the DVD on HDC. Note that it only works in 4 low.

Quote:
Hill Descent Control (HDC) – If Equipped

HDC is only intended for low speed off-road driving. HDC maintains vehicle speed while descending hills in off-road driving conditions by applying the brakes when necessary.


The symbol indicates the status of the Hill Descent Control (HDC) feature. The lamp will be on solid when HDC is armed. HDC can only be armed when the transfer case is in the “4WD LOW” position and the vehicle speed is less then 30 mph (48 km/h). If these conditions are not met while attempting to use the HDC feature, the HDC indicator light will flash on/off.
When enabled, HDC senses the terrain and activates when the vehicle is descending a hill. HDC speed may be adjusted by the driver to suit the driving conditions. The speed corresponds to the transmission gear selected.

Gear Approximate HDC Set Speed 1st 1 mph (1.5 km/h) 2nd 2.5 mph (4 km/h) DRIVE 7.5 mph (12 km/h) REVERSE 1 mph (1.5 km/h)
However, the driver can override HDC operation by applying the brake to slow the vehicle down below the HDC control speed. If more speed is desired during HDC control, the accelerator pedal will increase vehicle speed in the usual manner. When either the brake or the accelerator is released, HDC will control the vehicle at the original set speed.
  • Enabling HDC
  • Shift the transfer case into 4WD LOW range. Refer to “Four-Wheel Drive Operation” in “Starting and Operating” for further information.
  • Press the “Hill Descent” button. The “Hill Descent Control Indicator Light” in the instrument cluster will turn on solid. Note: If the transfer case is not in 4WD LOW range, the “Hill Descent Control Indicator Light” will flash for five seconds and HDC will not be enabled.
  • Disabling HDC
  • Press the “Hill Descent” button or shift the transfer case out of 4WD LOW range. The “Hill Descent Control Indicator” light in the instrument cluster will turn off.
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Old 08-18-2011, 08:05 PM   #19
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Quote:
Originally Posted by Up Hill Bill
My printed 2012 Owner's Manual came by UPS today. It's more than 600 pages! But, it'll still be easier to use than the stupid DVD. Sheesh, what a botched job!

Here's a copy & paste from the DVD on HDC. Note that it only works in 4 low.
Hi Bill, did you request a 2012 owners manual? Because I did not receive one,I only received a owners guide,and frankly ,that's not good enough.I don't care for the DVD thing either,they should always be suppliedin print.

AJ
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Old 08-18-2011, 08:08 PM   #20
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Hi Bill, did you request a 2012 owners manual? Because I did not receive one,I only received a owners guide,and frankly ,that's not good enough.I don't care for the DVD thing either,they should always be suppliedin print.

AJ
Call Jeep Customer Service at 1-877-426-533. You are entitled to a FREE, printed copy of the owner's manual. They send it UPS and you'll have it in about a week.
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Old 08-18-2011, 08:21 PM   #21
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Quote:
Originally Posted by Up Hill Bill

Call Jeep Customer Service at 1-877-426-533. You are entitled to a FREE, printed copy of the owner's manual. They send it UPS and you'll have it in about a week.
Thank you Bill, that's excellent,I will do that first thing in the morning.

I would not have known that if it were not for this forum, thanks again Bill.

AJ
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Old 08-18-2011, 08:26 PM   #22
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Originally Posted by Up Hill Bill View Post
My printed 2012 Owner's Manual came by UPS today. It's more than 600 pages! But, it'll still be easier to use than the stupid DVD. Sheesh, what a botched job!

Here's a copy & paste from the DVD on HDC. Note that it only works in 4 low.
Thanks for that take from the REAL Owners Manual, Bill.

I know paper cost money, but so do our $30K+ Wranglers!

Chrysler should just put the FULL PRINTED MANUAL in all Wranglers!
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Old 08-19-2011, 07:54 AM   #23
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Quote:
Originally Posted by Up Hill Bill

Call Jeep Customer Service at 1-877-426-533. You are entitled to a FREE, printed copy of the owner's manual. They send it UPS and you'll have it in about a week.
Bill ,is that the correct number?

AJ
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Old 08-19-2011, 08:05 AM   #24
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Originally Posted by RaiderRUBICON

Bill ,is that the correct number?

AJ
Ok ,I did find a number that works,

1-877-847-7166

AJ
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Old 08-19-2011, 09:34 AM   #25
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Ok ,I did find a number that works,

1-877-847-7166

AJ
Oops! I'm impossibly lazy and just copied and pasted the I-AM-JEEP number, and missed selecting the last number, I guess. Sorry.

The correct number is: 1-877-426-5337
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Old 11-26-2011, 05:18 PM   #26
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So after watching a few videos, I saw the info about Hill Descent....and just now I see Hill Descent (if Equipped). My 12 Rubicon apparently was not equipped.

I'm a noob to Jeeps and am trying to learn, but it seems there are lots of features available for which there's absolutely no information in any of the brochures, the website, etc. I certainly would've ordered Hill Descent had I even known it existed. Where does Jeep hide information about available options? It's certainly not very available.
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Old 11-26-2011, 06:45 PM   #27
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Anybody tried to watch the dvd on their 730?
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Old 11-26-2011, 07:45 PM   #28
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I know it's an automatic transmission only option but not sure if it is standard on the autos.
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Old 11-26-2011, 09:46 PM   #29
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I know it's an automatic transmission only option but not sure if it is standard on the autos.
It came standard on my sahara auto, and I didn't order it. Ol Brandenburg must have a manual. Manual is the name of my Gardner, not the trany in my jeep!
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Old 11-26-2011, 10:03 PM   #30
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It came standard on my sahara auto, and I didn't order it. Ol Brandenburg must have a manual. Manual is the name of my Gardner, not the trany in my jeep!
Yep....I have stick shift.

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