Pinpoint Test C : No Sound From All Speakers

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

C1 CHECK THE START SENSE CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: ACM C290A .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C290A-15	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.
No	GO to C2.

C2 CHECK FOR CORRECT ACM OPERATION

Ignition OFF.

Disconnect and inspect the ACM connectors and related in-line 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 and related in-line 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.