Symptom Chart

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
The audio unit is inoperative/does not operate correctly	Fuse Wiring, terminals or connectors Audio unit	Go to Pinpoint Test A .
The CD player is inoperative/does not operate correctly	Audio unit	INSTALL a new audio unit. REFER to Audio Unit . TEST the system for normal operation.
The audio unit does not operate correctly - display is blank	Audio unit	INSTALL a new audio unit. REFER to Audio Unit . TEST the system for normal operation.
Poor reception	Antenna Antenna cable Generator Ignition system Noise suppression equipment Audio unit	Go to Pinpoint Test B .
Continuous seek/scan in AM/FM	RDS function setting	VERIFY the RDS is set to ALL. REFER to the Owner's Literature. SCAN for a good channel. If a good channel is found, the cause of the concern was that no RDS channel in the selected category was found. The system is OK. If no good channel is found, go to Pinpoint Test B .
	Antenna Antenna connections Audio unit	Go to Pinpoint Test B .
Poor quality/distorted sound from one or more speakers (not all speakers)	Wiring, terminals or connectors Loose trim panel Speaker Audio unit	Go to Pinpoint Test C .
Poor quality/distorted sound from all speakers	Audio unit	INSTALL a new audio unit. REFER to Audio Unit . TEST the system for normal operation.
No sound from one or more of the speakers (not all speakers)	Wiring, terminals or connectors Speaker Audio unit	Go to Pinpoint Test D .
No sound from all speakers	Speaker(s) Wiring, terminals or connectors Audio unit	With the key in any position except START, MEASURE the voltage between the audio unit C240-3, circuit 1000 (RD/BK), harness side and ground. If voltage is present, REPAIR the circuit. TEST the system for normal operation. If no voltage is present, INSTALL a new audio unit. REFER to Audio Unit . TEST the system for normal operation.
Loud popping sound when cycling the ignition switch	Fuse Wiring, terminals or connectors Audio unit	With the key in START, MEASURE the voltage between the audio unit C240-3, circuit 1000 (RD/BK), harness side and ground. If the voltage is less than 10 volts, CHECK the central junction box (CJB) fuse 27 (5A). If OK, REPAIR the circuit. TEST the system for normal operation. If the voltage is 10 volts or greater, INSTALL a new audio unit. REFER to Audio Unit . TEST the system for normal operation.