For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on and the Radio in Navigation mode.Set Condition:With the Radio in Navigation mode. The Radio does not detect an Antenna connection or does not receive a Navigation (GPS) signal.Possible CausesBAD ANTENNA CONNECTIONRADIOANTENNA1. TEST ANTENNATurn the ignition off.Disconnect the GPS Antenna connector.Inspect the GPS Antenna connection.Was the Antenna connection clean and secure?YesGo To 2 NoRepair the Antenna connection as needed.Perform the BODY VERIFICATION TEST — VER1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 2. ANTENNARefer to the Audio System in the Service Information and test the antenna in accordance with the Service Procedure.Is the Antenna ok?Yes Go To 3 NoRepair or replace the Antenna assembly in accordance with the Service Information.Perform the BODY VERIFICATION TEST — VER1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) 3. RADIOReconnect all previously disconnected components.Move vehicle outside approximately 30ft (9.14m) from any structure.Turn the ignition and Radio on.With the scan tool, clear all DTC's and operate the Navigation system.With the scan tool, read DTC's.Does the scan tool display active: B142E-GPS ANTENNA NOT CONNECTED?YesReplace the Radio in accordance with the Service Information.Perform the BODY VERIFICATION TEST-VER1.(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) NoTest Complete.