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Is250 Navigation Error

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I installed a laser jammer on my IS250 this weekend and had to remove the navigation and radio system to run the wires from the left passenger side across to the right hand side (drivers side). All I did was remove the connector plugs from the back of the unit. I left the unit out overnight and when I went to install it again, I plugged the connectors in the correct order back onto the unit and now the navigation is telling me that the external system is disconnected. I've double checked if perhaps I left one of the connectors out by mistake, but all the connectors are in and none have been left out at all. When I installed the laser jammer I removed the front bumper and disconnected all the connectors on the bumper. When putting back the bumper all the connections were made and as of now no errors are occuring with the car at all. All the systems are working correctly with no faults or error codes. The radio, cd, dvd, telephone and climate control are all working fine. The start up screen comes up with the Lexus logo and then goes blank. If I press the Map button on the unit the error code (external system is dissconnected) comes up. Please can someone assist me with this? Anyones help would be greatly appreciated. Thanks in advance.

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