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Symptom: INTERNAL NAV MODULE FAILURE When Monitored and Set Condition: INTERNAL NAV MODULE FAILURE When Monitored: When the Navigation Unit is powered up. Set Condition: The NAV unit fails the loop back (internal PCI bus circuitry) test. Unit will stay off-line unless loop back test is passed. POSSIBLE CAUSES NAVIGATION UNIT TEST ACTION APPLICABILITY 1 With the DRBIII t, erase DTCs. Turn the ignition off, wait 10 seconds, then turn the ignition on. t, read DTCs. If this DTC resets, view repair. All Repair Replace the Navigation Unit in accordance with the Service 745 NAVIGATION |