Originally Posted by jblakeman
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?
TSB 08-004-08 REV. A may relate to your vehicle’s second concern:
Flash: Headlamps Slightly Jitter/Bounce Up And Down While Vehicle Is At Stop
This bulletin involves flashing the Automatic Headlamp Leveling Module (AHLM) with new
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**
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