Symptom Chart

WARNING: This page is about a different car, the 2005 Ford Mustang. 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	Circuitry Audio unit	GO to PINPOINT TEST A .
The audio unit is inoperative/does not operate correctly	Circuitry Audio unit	GO to PINPOINT TEST B .
Poor reception	Antenna Antenna connections Noise suppression equipment Audio unit	GO to PINPOINT TEST C .
Continuous SEEK/SCAN in AM/FM	Antenna Antenna connections Noise suppression equipment Audio unit	GO to PINPOINT TEST C .
Poor quality/distorted sound from one or more speakers (not all speakers)	Speaker(s) Circuitry Audio unit	GO to PINPOINT TEST D .
Poor quality/distorted sound from all speakers	Antenna Antenna connections Audio unit	GO to PINPOINT TEST E .
No sound from one or more of the speakers (not all speakers)	Speaker(s) Circuitry Audio unit	GO to PINPOINT TEST D .
No sound from all speakers	Circuitry Audio unit	REMOVE the audio unit. REFER to AUDIO UNIT . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
The subwoofer is inoperative	Circuitry Audio unit Subwoofer amplifier	GO to PINPOINT TEST F .
Loud popping sound when cycling the ignition switch	Circuitry Audio unit Subwoofer amplifier(s)	GO to PINPOINT TEST G .
Audio unit illumination is inoperative.	Circuitry Audio unit	REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION for diagnosis of the instrument cluster and panel illumination.
The vehicle speed sensitive volume feature does not operate correctly.	Audio unit Medium speed - controller area network (CAN) communication network	REFER to MODULE COMMUNICATIONS NETWORK for diagnosis of the CAN communication network. If the CAN passes the diagnosis, REMOVE the audio unit. REFER to AUDIO UNIT . SEND the audio unit to an authorized repair facility. TEST the system for normal operation after the repair.