Symptom Chart

WARNING: This page is about a different car, the 2005 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 audio unit - P100i	Circuitry Audio unit Central junction box (CJB)	GO to PINPOINT TEST A .
The audio unit is inoperative/does not operate correctly - P100i	Circuitry Audio unit	GO to PINPOINT TEST B .
The audio unit does not operate correctly - display is frozen or no graphics are displayed (Navigation)	Circuitry Audio unit Navigation system module	REFER to NAVIGATION SYSTEM .
The cassette player is inoperative	Audio unit	REMOVE the audio unit. REFER to AUDIO UNIT . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
The compact disc changer is inoperative/does not operate correctly (P100i)	Circuitry Audio unit CD changer	GO to PINPOINT TEST C .
The audio unit does not display the compact disc (CD) changer information	Circuitry Audio unit CD changer	GO to PINPOINT TEST D .
Poor reception	Antenna Circuitry Antenna connections Noise suppression equipment Audio unit	GO to PINPOINT TEST E .
Radio reception is poorer with the defroster activated	Defroster grid	INSPECT the defroster grid for damaged grid lines. REPAIR as necessary. TEST the system for normal operation. If the concern is still present, GO to PINPOINT TEST E .
Continuous seek/diagnostic in AM/FM	Audio unit Antenna Antenna connections	GO to PINPOINT TEST E .
Poor quality/distorted sound from one or more speakers (not all speakers) - P100i	Speaker(s) Circuitry Audio unit	GO to PINPOINT TEST F .
Poor quality/distorted sound from all speakers - P100i	Speaker(s) Circuitry Audio unit	REMOVE the audio unit. REFER to AUDIO UNIT . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
No sound from one or more of the speakers (not all speakers) - P100i	Speaker(s) Circuitry Audio unit Antenna system	GO to PINPOINT TEST F .
No sound from all speakers	Speaker(s) Circuitry Audio unit	REMOVE the audio unit. REFER to AUDIO UNIT . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
Loud popping sound when cycling the ignition switch	Audio unit Subwoofer enable line shorted Subwoofer input line shorted	GO to PINPOINT TEST G .
The subwoofer is inoperative - P100i	Circuitry Subwoofer Audio unit	GO to PINPOINT TEST H .
The audio unit illumination is inoperative	Circuitry Audio unit	REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
The auxiliary audio control is inoperative - steering wheel controls	Circuitry Audio unit Steering wheel control switches Speed control servo Clockspring	GO to PINPOINT TEST I .
The auxiliary audio control is inoperative/does not operate correctly - rear auxiliary audio controls	Circuitry Audio unit Rear auxiliary control switches Auxiliary audio module	GO to PINPOINT TEST J .
Poor quality/distorted sound from one or more speakers (not all speakers) - Navigation	Speaker(s) Circuitry Audio amplifier Audio unit	GO to PINPOINT TEST K .
Poor quality/distorted sound from all speakers - Navigation	Audio amplifier Audio unit	If the audio unit illuminates, REFER to NAVIGATION SYSTEM . If the audio unit does not illuminate, REMOVE the audio unit. REFER to AUDIO UNIT . SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
No sound from one or more of the speakers (not all speakers) - Navigation	Speaker(s) Circuitry Audio unit Audio amplifier	GO to PINPOINT TEST K .
No sound from all speakers - Navigation	Audio unit	GO to PINPOINT TEST M .
The subwoofer is inoperative - Navigation	Circuitry Subwoofer speaker Audio amplifier Audio unit	GO to PINPOINT TEST L .