Pinpoint Test E : No Sound From All Speakers

E1 CHECK THE START SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: ACM C240A .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C240A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage 5V or greater?

Yes	REPAIR the circuit.
No	GO to E2.

E2 CHECK FOR SPEAKER DTCs
- Ignition ON.
- Using a diagnostic scan tool, perform the ACM self-test.
Are any DTCs present?

Yes Refer to Information and Entertainment System - Premium

No GO to E3.

E3 CHECK FOR CORRECT ACM OPERATION

Ignition OFF.

Disconnect and inspect all ACM connectors.

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 ACM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

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 ACM. Refer to Audio Control Module (ACM) .
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.