Symptom Chart

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

DIAGNOSTIC REFERENCE

Condition	Possible Sources	Action
The audio unit is inoperative/does not operate correctly	Circuitry. Audio unit. Ignition switch.	Go To PINPOINT TEST A: THE AUDIO UNIT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
Audio unit display blank - audio unit operates	Audio unit.	REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
Tape player only inoperative	Audio unit.	REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
Poor reception	Antenna connections. Noise suppression equipment.	Go To PINPOINT TEST B: POOR RECEPTION .
Continuous seek/scan in AM/FM	Audio unit. Antenna. Antenna connections.	Go To PINPOINT TEST C: CONTINUOUS SEEK/SCAN IN AM/FM .
Poor quality sound from one or more speakers (not all speakers)	Speaker(s). Audio unit. Amplifier.	Go To PINPOINT TEST D: POOR QUALITY/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) .
Poor quality sound from all speakers	Circuitry. Speaker(s). Audio unit. Amplifier.	Go To PINPOINT TEST E: POOR QUALITY/NO SOUND FROM ALL SPEAKERS .
No sound from one or more of the speakers (not all speakers)	Circuitry. Speaker(s). Audio unit. Amplifier.	Go To PINPOINT TEST D: POOR QUALITY/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) .
No sound from all of the speakers	Circuitry. Audio unit. Amplifier. Smart junction box (SJB). Four-wheel drive control module (manual transmission). Digital transmission range (DTR) sensor (automatic transmission).	Go To PINPOINT TEST E: POOR QUALITY/NO SOUND FROM ALL SPEAKERS .
The subwoofer is inoperative - CDX6 Audiophile	Circuitry. Audio unit. Subwoofer amplifier.	Go To PINPOINT TEST F: THE SUBWOOFER IS INOPERATIVE - CDX6 AUDIOPHILE .
The subwoofer is inoperative - TREMOR	Circuitry. Audio unit. Audio unit amplifier.	Go To PINPOINT TEST D: POOR QUALITY/NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS) .
Loud popping sound when cycling the ignition switch - CDX6 Audiophile	Circuitry. Audio unit. Subwoofer amplifier.	Go To PINPOINT TEST G: LOUD POPPING SOUND WHEN CYCLING THE IGNITION SWITCH - CDX6 AUDIOPHILE .
Loud popping sound when cycling the ignition switch - TREMOR	Circuitry. Audio unit. Audio unit amplifier.	Go To PINPOINT TEST H: LOUD POPPING SOUND WHEN CYCLING THE IGNITION SWITCH - TREMOR .
One or more audio control buttons (such as volume, seek, tune and scan) are not functional in either radio, tape, or CD mode or all modes	Audio unit.	REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
When the headlamp switch is in PARK or HEADLAMP position and the ignition switch is in the RUN or ACC position, the audio unit back lighting is inoperative - all other instrument panel lighting functions are normal	Circuitry. Audio unit.	REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
The audio unit has 2 items that can be dimmed: the audio unit display and the control buttons - one dims and the other does not	Audio unit.	REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
Irregular operation of display and indicator LEDs	Audio unit.	REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
Response time between pressing any of the audio control buttons and system response is more than 2 seconds	Audio unit.	REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.
Audio unit clock is inoperative	Audio unit.	REFER to the owner literature for clock operation. If the clock is inoperative, REMOVE the audio unit and SEND it to an authorized repair facility. TEST the system for normal operation.