Pinpoint Test K : The RF Tweeter Speaker Is Inoperative Or Has Poor Sound Quality

K2 CHECK THE AUDIO SIGNAL TO THE RF TWEETER SPEAKER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C613B-1	Courtesy of FORD MOTOR COMPANY	C613B-3

Is a fluctuating AC voltage present?

Yes	INSTALL a new RF tweeter speaker. Refer to Speaker - Tweeter .
No	GO to K3.

K3 CHECK THE AUDIO CIRCUITS TO THE RF TWEETER SPEAKER FOR A SHORT TO VOLTAGE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C613B-1	Courtesy of FORD MOTOR COMPANY	Ground
C613B-3	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.
No	GO to K4.

K4 CHECK THE AUDIO CIRCUITS TO THE RF TWEETER SPEAKER FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C613B-1	Courtesy of FORD MOTOR COMPANY	Ground
C613B-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes	GO to K5.
No	REPAIR the circuit in question.

K5 CHECK THE AUDIO CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C613B-1	Courtesy of FORD MOTOR COMPANY	C613B-3

Is the resistance greater than 10, 000 ohms?

Yes	GO to K6.
No	REPAIR the circuits.

K6 CHECK THE AUDIO CIRCUITS TO THE RF TWEETER SPEAKER FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C612B-2	Courtesy of FORD MOTOR COMPANY	C613B-1
C612B-4	Courtesy of FORD MOTOR COMPANY	C613B-3

Are the resistances less than 3 ohms?

Yes	INSTALL a new RF door speaker. REFER to Speaker - Door .
No	REPAIR the circuit in question.