Symptom Chart

WARNING: This page is about a different car, the 2004 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the navigation system module	Central junction box (CJB) fuse(s): 32 (10A) 33 (15A) Circuitry. Navigation system module.	Go To PINPOINT TEST A: NO COMMUNICATION WITH THE NAVIGATION SYSTEM MODULE .
Navigation system does not operate correctly - no global positioning system (GPS) antenna signal	Circuitry. GPS antenna. Navigation system module.	Go To PINPOINT TEST B: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - NO GLOBAL POSITIONING SYSTEM (GPS) ANTENNA SIGNAL .
Navigation system does not operate correctly - the position cursor is inoperative	Circuitry. Navigation system module.	Go To PINPOINT TEST C: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE POSITION CURSOR IS INOPERATIVE .
Navigation system does not operate correctly - the voice guidance is inoperative/does not operate correctly	Circuitry. Audio unit. Navigation system module.	Go To PINPOINT TEST D: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE VOICE GUIDANCE IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
Navigation system does not operate correctly - the display screen is inoperative	Circuitry. Audio unit. Navigation system module.	Go To PINPOINT TEST E: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE DISPLAY SCREEN IS INOPERATIVE .
Navigation system does not operate correctly - the navigation screen is inoperative	Circuitry. Audio unit. Navigation system module.	Go To PINPOINT TEST F: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE NAVIGATION SCREEN IS INOPERATIVE .
Navigation system does not operate correctly - the audible switches are inoperative	Circuitry. Audio unit. Navigation system module.	Go To PINPOINT TEST G: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE AUDIBLE SWITCHES ARE INOPERATIVE .
Navigation system does not operate correctly - unable to insert or eject a map disc	Circuitry. Navigation system module.	Go To PINPOINT TEST H: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - UNABLE TO INSERT OR EJECT A MAP DISC .
Navigation system does not operate correctly - the audio unit is inoperative	Central junction box (CJB) fuse(s): 24 (5A) 32 (10A) 33 (15A) Circuitry. Audio unit. Navigation system module	Go To PINPOINT TEST I: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE AUDIO UNIT IS INOPERATIVE .