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Symptom: NAV SWITCH INPUT CIRCUIT OPEN When Monitored and Set Condition: NAV SWITCH INPUT CIRCUIT OPEN When Monitored: The MIC power-up diagnostics will test the NAV Button A/D port for either an open circuit, short to power or ground, or a stuck button exists. Set Condition: The Instrument Cluster detects no feedback on the NAV Switch Sense circuit. The MIC will suspend operation of the NAV System until the fault is cleared. POSSIBLE CAUSES EVIC/NAV MUX RETURN CIRCUIT OPEN INSTRUMENT PANEL SWITCH POD FAULT NAV MUX SIGNAL CIRCUIT OPEN INSTRUMENT CLUSTER TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → Repair the EVIC/NAV Mux Return circuit for an open. Perform BODY VERIFICATION TEST - VER 1. No → Go To 2 2 Turn the ignition off. All Yes → Go To 3 No → Replace the Instrument Panel Switch Pod in accordance with the Service Information. 721 INSTRUMENT CLUSTER |