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Unread 01-27-2016, 08:05 PM   #1
jblakeman
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2008 WK 
 
Join Date: Aug 2012
Location: Twin Lakes, WI
Posts: 29
HID Issues / Reverse Sensor Issues

All,

I've recently traded in my '07 Overland for a '08 Overland and while I love the upgrades over my previous WK...I've noticed a couple issues that I haven't been clear on finding a solution...

1. When backing up in reverse I have the two dim amber LED's in the bar (just like my 07) however it now beeps once prior to the LED's filling in as I get close to an object (which then it won't beep again until your close to hitting something). Is this normal to beep twice per say when backing up....again my 07 only beeped when you were pretty much ready to hit something (solid red LED's)?!?

2. The HID headlights have been interesting....Sometimes they are pavement pounders (literally pointing all the way down...lower than the fog lights and don't adjust)...Other times they are normal height (compared to my old halogens on the 07)...but don't seem to ever move while driving or adjust to terrain, etc. Then other times I start the Jeep the go all the way down on ignition but don't move again until 15 minutes down the road then they cycle to normal height...

I know there is a problem as I test drove another 08 Overland at night before buying this one and the HID's were constantly moving up / down while going down the road....

From my reading there is 3 modules...the main controller under the pass headlight, a height sensor on the front axle, finally one on the rear. What's weird is I'm not sure which of the 3 is causing the problem....any ideas?

Thanks,

Jon

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Unread 01-27-2016, 09:30 PM   #2
CMSRock
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1999 WJ 
 
Join Date: May 2015
Location: Garfield, Kentucky
Posts: 46
I have an 08 overland and when backing up it gives me a beep first at 4-5 feet and then as I get closer it will start beeping faster and then if I get real close it will go to a continuous tone. I recently found out that snow and ice on the sensors will give the continuous tone as well. Mine have always worked that way and they pick up other vehicles and solid walls in a parking garage at over 5 feet. I really never look at the led lights because I am usually looking in the outside mirror while backing up into a parking spot. For some reason my depth perception seems better with the outside mirrors than with the rear view. I do know when it goes to a full tone I am within a foot of hitting something.


Haven't really paid attention to the headlights, I know they adjust themselves and without a malfunction they have not drawn any attention.
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Unread 01-28-2016, 10:15 AM   #3
JeepCares
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Quote:
Originally Posted by jblakeman View Post
All,

I've recently traded in my '07 Overland for a '08 Overland and while I love the upgrades over my previous WK...I've noticed a couple issues that I haven't been clear on finding a solution...

1. When backing up in reverse I have the two dim amber LED's in the bar (just like my 07) however it now beeps once prior to the LED's filling in as I get close to an object (which then it won't beep again until your close to hitting something). Is this normal to beep twice per say when backing up....again my 07 only beeped when you were pretty much ready to hit something (solid red LED's)?!?

2. The HID headlights have been interesting....Sometimes they are pavement pounders (literally pointing all the way down...lower than the fog lights and don't adjust)...Other times they are normal height (compared to my old halogens on the 07)...but don't seem to ever move while driving or adjust to terrain, etc. Then other times I start the Jeep the go all the way down on ignition but don't move again until 15 minutes down the road then they cycle to normal height...

I know there is a problem as I test drove another 08 Overland at night before buying this one and the HID's were constantly moving up / down while going down the road....

From my reading there is 3 modules...the main controller under the pass headlight, a height sensor on the front axle, finally one on the rear. What's weird is I'm not sure which of the 3 is causing the problem....any ideas?

Thanks,

Jon
Hey Jon,

TSB 08-004-08 REV. A may relate to your vehicle’s second concern:

SUBJECT:
Flash: Headlamps Slightly Jitter/Bounce Up And Down While Vehicle Is At Stop
OVERVIEW:
This bulletin involves flashing the Automatic Headlamp Leveling Module (AHLM) with new
software.
MODELS:
2008 (WH) Grand Cherokee (International Markets)
NOTE: This bulletin applies to the above listed vehicles equipped with a Automatic
Headlamp Leveling system (sales code LMP) built before **April 2, 2008**
(MDH 0109XX).
SYMPTOM/CONDITION:
The customer may experience a headlamp jitter or bounce condition. This condition can
also be described as movement of the beam pattern when the car is stop.
This may be due to the automatic headlamp leveling system trying to adjust the lamps
when the car is not moving. The system works by reading the suspension sensor locations
and converting them into digital counts. When a car is stopped, it is possible for the sensor
position to be located between steps. If this occurs, the module attempts to interpret the
sensor position by alternating the counts between two values. The module will then
interpret the change in the counts as suspension movement and try to adjust the lights
accordingly.
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Unread 01-28-2016, 06:35 PM   #4
jblakeman
Registered User
2008 WK 
 
Join Date: Aug 2012
Location: Twin Lakes, WI
Posts: 29
CMSRock....thanks for the info....tonight actually I killed the engine and left the ignition on in reverse. Did some walking around with a reverse mirror in the backseat and the sensors seem to be working fine...just have to get used to the "first" beep when still about 4 feet from an object....

JeepCares...thanks for the TSB...though "that" symptom was on the test driven Jeep....mine doesn't seem to come close to working at all except on ignition start (going to the ground)....and the occasional one adjustment up when driving....haven't ever seen it adjust while idle or at a stop....
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