Pinpoint Test G: No Sound From One Or More Of The Speakers - Video System Output To The Front Speakers

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: On vehicles equipped with a CD6 audio unit, interrupting battery power within 30 seconds of repowering will damage the audio unit. To prevent audio unit damage, do not disconnect the battery (or audio unit), reconnect the battery (or audio unit), and then disconnect it again within 30 seconds.

G1 ISOLATE CONDITION
- Key in ON position.
- Turn on the audio unit.
- Carry out the speaker walk around test.
- Are all the speakers without sound?
- Yes : GO to PINPOINT TEST H .
- No : GO to G2.

G2 CHECK OUTPUT CIRCUIT(S) FOR SHORT TO POWER

Key in OFF position.
Disconnect: Audio Unit C2188b.
Disconnect: Video Cassette Player C3076a.
Key in ON position.

Measure the voltage between the audio unit C2188b, harness side and ground, as follows:

PIN CIRCUIT SPECIFICATION

Pin	Circuit
17	1561 (OG)
18	1562 (YE)
19	1559 (RD)
20	1560 (WH)

Fig 1: Measuring Voltage Between Audio Unit Harness Side And Ground

Courtesy of FORD MOTOR CO.

Is any voltage present?

Yes : REPAIR the circuit(s) in question. TEST the system for normal operation.
No : GO to G3.

G3 CHECK OUTPUT CIRCUIT(S) FOR OPEN OR SHORT TO GROUND

Key in OFF position.

Measure the resistance between the audio unit C2188b, harness side and the VCP C3076a, harness side; and between the audio unit C2188b, harness side and ground as follows:

Fig 2: Measuring Resistance Between Audio Unit Harness Side And Ground

Courtesy of FORD MOTOR CO.

CONNECTOR PIN SPECIFICATION

Audio Unit		VCP
Connector-Pin	Circuit	Connector-Pin	Circuit
C2188b-17	1561 (OG)	C3077b-14	185 (YE)
C2188b-18	1562 (YE)	C3077b-13	175 (OG)
C2188b-19	1559 (RD)	C3077b-11	155 (RD)
C2188b-20	1560 (WH)	C3077b-12	165 (WH)

Are the resistances less than 5 ohms between the audio unit and the VCP; and greater than 10,000 ohms between the audio unit and ground?

Yes : CONTACT an authorized Ford audio repair facility for further diagnostic assistance.
No : REPAIR the circuit(s) in question. TEST the system for normal operation.