Question about 2007 Jeep Liberty Sport

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RB4 Calibration / Sensors Menu Question

Hi Bruce,

I see you've provided very knowledgeable information regarding the Harman-Becker RB4 navigation radio from Chrysler. I had the dealer install a brand-new unit, in the box (date coded 9-22-04) in my 2007 Jeep Liberty, with factory Sirius and U-Connect. The unit works fine, and originally came with the AG/2060 software CD set.

I bought the latest AA/2070 disk set and upgraded the firmware in the unit. The install took about 10 minutes and went fine. The upgrade required a recalibration (it wiped out the satellite almanac data). A pleasant surprise with this firmware release is that the unit also now displays the song/title information for the factory Sirius (Delphi) receiver.

However, my question is in regards to the navigation Configuration - Sensors menu. Running on the original AG/2060 software, the unit always displayed the driving direction as "Forward", regardless of whether the vehicle was in forward or reverse gear. After upgrading to the AA/2070 software, this menu always shows the driving direction as "Backwards", whether or not the vehicle is in forward or reverse gear. All the other sensor (speed, gyro) information changes as the vehicle is moving and is turned left and right. The calibration status is 3, and the navigation works perfectly. Does the "Driving Direction = " function do anything, or is this perhaps a quirk in the 2070 software? Interestingly, with the ignition in the ACC position, this menu sometimes shows the driving direction as Forward, but whenever the ignition is in the ON position, this menu always shows it as Backwards. (I did the upgrade with the ignition in the ACC position.) All J1850-related functions (such as dimming and speed sense, and integration with Sirius and U-Connect) work fine. The 2006-07 Liberty uses a hybrid (J-1850/CAN) bus system - could this be confusing the unit?

Also, is there any way (perhaps a hidden service menu) to make the clock display continuously when the unit is turned off? Pressing the "Time" button only displays it for a few seconds. The new MyGIG (RER/REN) unit has a menu option that allows it to continuously show the time when the unit is off.

My only complaint is that I wish H/B would issues an updated set of map discs! The files on the CD set are from May, 2004, so they are getting quite old! This unit is based on the H/B Traffic Pro, and it seems as if Harman has dropped all support for that unit, too.

I appreciate your input! I'm an electrical engineer, so I'm knowledgeable about this kind of stuff. Is a service manual available - the owner's manual provides very little information beyond the basics?

Thanks so much in advance,

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Hi Chris
I have run across the problem with the display showing that you are going backwards on units I work on my bench.As long as you are getting the distance pulses and the nav functions are operating properly the should be no problems.You reinstall the 2060 ver and see if it reverts back to the way it was.Then reinstall the 2070 ver again.The main changes that were madewere to the update speed for the GPS functions.I do have a service manual,but cannot release it to anyone.From what i understand I am the only one that is Factory authorized to repair the RB4 units in the USA.
Feel free to msg me about any other questions you have about the unit
Yes theCAN BUS could cause a problem.
The 07 chrysler's use the highspeed CAN C in some of the app's in the vehicle.But from what I understand they are only using 125hz can BUS speed(which some consider low speed CAN) But as you mentioned the radio is talking on the BUS so it must also have J1850 communication.The RB4 does not have CAN built into the unit.

Posted on Jan 09, 2009


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