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Hi Dudley, I would suggest that you try the following reset:
To do the reset you need to turn the receiver on then on the front panel of the receiver press and hold the "VIDEO1/VCR" button while doing that press the "STANDBY/ON" button.You will see the word "Clear" in the display screen and the receiver will go into standby mode. PLEASE UNDERSTAND THAT YOU WILL LOSE ALL YOUR AUDIO & VIDEO ASSIGNMENTS ON THE RECEIVER PLUS YOU WILL LOSE ALL YOUR SPEAKER CONFIGURATIONS, SPEAKER DISTANCE AND ALL LEVEL CALIBRATION SETTINGS.YOU WILL ALSO LOSE ANY PROGRAMMED RADIO STATIONS IN MEMORY.Once the receiver goes into standby mode turn it back on and go thru the setup menu for all custom settings.
its more than likely the back light.
if its a removable front then tke it off and check that all the contacts are sitting prominantly so to contact the removable front and check for dirt or ware and tare on them if not then either its warrenty job or take it to repair shop
Pull the radio out, tape off all wires but yellow, red and black. Twist red/ yellow together and attach to positive 12 volt, attach black wire to negative 12 volts. Turn on radio and see if it comes out of protect mode. If it does, you will have to troubleshoot all of the speaker wires to find a short.
Try this it worked for me! Unplug usb ,phone cord then power cord for a few seconds. While holding down the (OK) and (ON) buttons plug power cord back in. It should get you out of the error code screen. Then you should be able to do the number (6) and (#) button reset as found on HP site! I hope this works for you as well.
With the receiver OFF, remove the USB device then turn the power ON. If the same display is repeated, use another USB device. Remove the USB device without entering the remove mode. If this does not work, try resetting the receiver. Press the "reset" button just above the AUX INPUT. This will return the unit to factory default settings. If these steps fail and you still get the USB error, the receiver is faulty and needs service.
Try disconnecting the Camera from the USB port and reinstallthe software program. When the program asks you to connect thecamera to the USB port, do so and it should work. Hope this helps. Bud
Sounds like the J1850 bus is not connected to the RB4 radio.The speed sensor info is received thru the bus which alows the nav to function and calibrate itself.Or as I have mentioned before, there may be problems on the NAV pcb.There have been many issues with the nav pcb assy.