Pinpoint Test O : The Subwoofer Speaker Is Inoperative Or Has Poor Sound Quality

O1 CHECK THE AUDIO SIGNAL TO THE SUBWOOFER SPEAKERS

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3020-1	Courtesy of FORD MOTOR COMPANY	C3020-2
C3020-3	Courtesy of FORD MOTOR COMPANY	C3020-4

Is a fluctuating AC voltage present?

Yes	INSTALL a new subwoofer speaker. Refer to Speaker - Subwoofer .
No	GO to O2.

O2 CHECK THE AUDIO CIRCUITS TO THE SUBWOOFER SPEAKER FOR A SHORT TO VOLTAGE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3020-1	Courtesy of FORD MOTOR COMPANY	Ground
C3020-2	Courtesy of FORD MOTOR COMPANY	Ground
C3020-3	Courtesy of FORD MOTOR COMPANY	Ground
C3020-4	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.
No	GO to O3.

O3 CHECK THE AUDIO CIRCUITS TO THE SUBWOOFER SPEAKER FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3020-1	Courtesy of FORD MOTOR COMPANY	Ground
C3020-2	Courtesy of FORD MOTOR COMPANY	Ground
C3020-3	Courtesy of FORD MOTOR COMPANY	Ground
C3020-4	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes	GO to O4.
No	REPAIR the circuit in question.

O4 CHECK THE AUDIO CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3020-1	Courtesy of FORD MOTOR COMPANY	C3020-2
C3020-3	Courtesy of FORD MOTOR COMPANY	C3020-4

Are the resistances greater than 10, 000 ohms?

Yes	GO to O5.
No	REPAIR the circuits in question.

O5 CHECK THE AUDIO CIRCUITS TO THE SUBWOOFER SPEAKER FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3020-1	Courtesy of FORD MOTOR COMPANY	C3154C-1
C3020-2	Courtesy of FORD MOTOR COMPANY	C3154C-9
C3020-3	Courtesy of FORD MOTOR COMPANY	C3154C-2
C3020-4	Courtesy of FORD MOTOR COMPANY	C3154C-10

Are the resistances less than 3 ohms?

Yes	GO to O6.
No	REPAIR the circuit in question.

O6 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION

Repair:
- Corrosion (clean module pins or install new connectors or terminals)
- Damaged or bent pins (install new terminals or pins)
- Pushed-out pins (install new pins as necessary)

Reconnect the audio DSP module connectors. Make sure they seat and latch correctly.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new audio DSP module. Refer to Audio Digital Signal Processing (DSP) Module .
No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.