Symptom Chart

WARNING: This page is about a different car, the 2003 Lincoln Navigator and 2003 Ford Expedition. 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	Central junction box (CJB) fuse(s): 31 (25 A). 7(5A). Circuitry. Audio unit. Ignition switch.	GO to PINPOINT TEST A: THE AUDIO UNIT IS INOPERATIVE .
The cassette player is inoperative/does not operate correctly	Audio unit.	REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
The audio unit does not operate correctly - display is blank	Audio unit.	REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
The CD changer is inoperative/does not operate correctly	Central junction box (CJB) fuse 4 (15A). Circuitry. Audio unit. CD changer.	GO to PINPOINT TEST B: THE CD CHANGER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY--VNR ONLY .
The audio unit does not display CD changer information-Vehicle Navigation Radio (VNR) only	Central junction box (CJB) fuse(s): 31 (25 A). 7(5A). 4 (15A). Circuitry. Audio unit. CD changer.	GO to PINPOINT TEST C: THE AUDIO UNIT DOES NOT DISPLAY CD CHANGER INFORMATION-VNR ONLY .
Poor reception	Antenna. Antenna connections. Noise suppression equipment. Audio unit. Cellular phone coax cable. Connections at battery, antenna, speaker leads or audio unit. Antenna isolator module.	GO to PINPOINT TEST D: POOR RECEPTION .
Continuous SEEK/SCAN in AM/FM	Antenna. Antenna connections. Audio unit. Antenna isolator module.	GO to PINPOINT TEST E: CONTINUOUS SEEK/SCAN IN AM/FM .
Poor sound quality/distorted sound from one or more speakers-not all speakers	Speaker(s). Wiring to speaker(s). Audio cable. Audio unit.	GO to PINPOINT TEST F: POOR SOUND QUALITY/DISTORTED SOUND FROM ONE OR MORE SPEAKERS-NOT ALL SPEAKERS .
Poor sound quality/distorted sound from all speakers	Speaker(s). Wiring to speaker(s). Audio unit.	GO to PINPOINT TEST G: POOR SOUND QUALITY/DISTORTED SOUND FROM ALL SPEAKERS .
No sound from one or more of the speakers - not all speakers	Speaker(s). Wiring to speaker(s). Audio unit.	GO to PINPOINT TEST F: POOR SOUND QUALITY/DISTORTED SOUND FROM ONE OR MORE SPEAKERS-NOT ALL SPEAKERS .
No sound from all speakers	Audio unit. Wiring to speakers.	GO to PINPOINT TEST G: POOR SOUND QUALITY/DISTORTED SOUND FROM ALL SPEAKERS .
The subwoofer is inoperative	Central junction box (CJB) fuse 31 (25A). Circuitry. Subwoofer. Subwoofer amplifier.	GO to PINPOINT TEST H: THE SUBWOOFER IS INOPERATIVE .
No auxiliary headphone audio	Rear seat entertainment unit.	If the rear radio speakers operate correctly, INSTALL a new RSC unit. REFER to Section AUDIO UNIT . TEST the system for normal operation.
The auxiliary audio control is inoperative-rear seat controller (RSC) unit	Central junction box (CJB) fuse 4 (15A). Circuitry. RSC unit. Headphone set.	GO to PINPOINT TEST I: THE AUXILIARY AUDIO CONTROLS ARE INOPERATIVE - REAR SEAT CONTROLLER (RSC) UNIT .
Loud popping sound when cycling the ignition switch	Subwoofer enable line shorted. Subwoofer amplifier.	GO to PINPOINT TEST J: LOUD POPPING SOUND WHEN CYCLING THE IGNITION SWITCH .
The auxiliary audio control is inoperative-steering wheel control	Battery junction box (BJB) fuse(s): 31 (25A). 7(5A). Circuitry. Clockspring. Steering wheel control switch. Audio unit.	GO to PINPOINT TEST K: THE AUXILIARY AUDIO CONTROL IS INOPERATIVE - STEERING WHEEL CONTROL .
Audio unit illumination inoperative	Circuitry. Audio unit.	REFER to Section INSTRUMENTATION & WARNINGSYSTEMS .
The video system is inoperative	Battery junction box fuse 4 (15A). Circuitry. Video system.	GO to PINPOINT TEST L: THE VIDEO SYSTEM IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The video display is inoperative	Circuitry. Video system.	GO to PINPOINT TEST L: THE VIDEO SYSTEM IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The video system does not operate correctly-no audio	Circuitry. Video system.	GO to PINPOINT TEST L: THE VIDEO SYSTEM IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
The video system does not operate correctly-remote control does not function correctly	Video system.	INSTALL new batteries in the remote control. If the concern is still present, CONTACT an authorized Ford audio repair facility for further diagnostic test procedures.