Question about Dakota Dodge RB4 Navigation, CD, AM/FM, with CD Changer Controls

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Gps is not working

I purchased the dodge rb4 nav-system and it seems that it does not work. i drove my truck over 800 miles and it does not display any directions. everything seems to be wired ok for my truck and the radio and cd-player is working great. the only thing that is not working is the gps. the unit searches for the city and state and it seems as through it keeps telling me to use the cd for the west coast. i am living on the east coast. do you know how i can resolve this problem? another problem is the gps calibration seems to always display my truck is going backwards and their is no pulses to get the unit functioning. can you shed some need light to my problem. i really appreciate it?

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  • William A. Dority
    William A. Dority May 10, 2007

    here is a picture of the gps radio.

  • West18 Aug 06, 2008

    I have a 2005 Dodge Ram with the same issues. The original radio worked fine and showed all of the major roads and most of the remote roads. I had the dealer replace the radio becuase it would go back to defaults once a week. I am on my 4th radio and still have the issue with it defaulting. I shared your comments with the dealer. Thanks , My new issue has been on the last 3 radios the Nav shows I am going forward in reverse and vice versa and it don't display most of the common roads and none of the remote roads. The dealer has been no help. Any suggestions?

  • West18 May 11, 2010

    I took your recommendations’ to the dealer and they see nothing wrong. They contacted Chrysler and the Radio / Nav is working to spec. Not sure how since I am going forward and it says reverse. But Do you know of any else they can check?



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I know the is a old post but i will provide some answers to the question.
1 the radio has to be connected to J1850 bus to talk with the sensors in the vehicle
2 check nav ant for broken wire.
3 check nav ant socket (center pin) should have no less than 4.95 volts DC with radio on.
4 Problem more than likely on nav PCB .
I have run across MANY problems on the nav pcb.

Posted on Jun 17, 2008


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