Pinpoint Test G: No Sound From All Sync® Audio Sources (BLUETOOTH, USB, Audio Input Jack)

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

G1 VERIFY THE OPERATION OF THE SYNC® SYSTEM AUDIO SOURCES
- Connect: Multi-Media Interface Tester (105-00120).
- Using the Multi-Media Interface Tester (105-00120), TEST the audio output for the audio input jack, USB port, and Bluetooth connection.
- Is there poor quality/distorted/no sound from each SYNC® audio source?
- Yes : GO to G2.
- No : If the concern is only with some (but not all) of the audio sources, GO to Symptom Chart - SYNC System to diagnose the observed symptom. If all audio sources operate correctly, the concern is with the customer device.

G2 CHECK THE CIRCUITS FROM THE APIM FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: ACM C290A.
Disconnect: APIM C2383.
Ignition ON.

Measure the voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C2383-23	VME53 (VT/GN)	-	Ground
C2383-24	RME53 (BN/WH)	-	Ground
C2383-25	VME52 (BU)	-	Ground
C2383-26	RME52 (GY/OG)	-	Ground

Fig 1: Identifying ACM C290A Switch Connector Terminals

Courtesy of FORD MOTOR CO.

Is any voltage present?

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

G3 CHECK THE CIRCUITS FROM THE APIM FOR AN OPEN OR SHORT TO GROUND

Ignition OFF.

Measure the resistance between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C290A-9	VME53 (VT/GN)	C2383-23	VME53 (VT/GN)
C290A-9	VME53 (VT/GN)	-	Ground
C290A-10	RME53 (BN/WH)	C2383-24	RME53 (BN/WH)
C290A-10	RME53 (BN/WH)	-	Ground
C290A-1	VME52 (BU)	C2383-25	VME52 (BU)
C290A-1	VME52 (BU)	-	Ground
C290A-2	RME52 (GY/OG)	C2383-26	RME52 (GY/OG)
C290A-2	RME52 (GY/OG)	-	Ground

Fig 2: Checking Circuits From APIM For Open Or Short To Ground

Courtesy of FORD MOTOR CO.

Are the resistances less than 3 ohms between the ACM and the APIM, and greater than 10, 000 ohms between the ACM and ground?

Yes : GO to G4.
No : REPAIR the circuit in question. TEST the system for normal operation.

G4 CHECK FOR CORRECT APIM OPERATION
- Connect: All Disconnected Connectors.
- Disconnect the APIM connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the APIM connector and make sure it seats correctly.
- Wait 2 minutes for the APIM to re-initialize.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new APIM. REFER to ACCESSORY PROTOCOL INTERFACE MODULE (APIM) . TEST the system for normal operation. If the concern is still present, GO to G5.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
G5 CHECK FOR CORRECT ACM OPERATION
- Disconnect all the ACM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the ACM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new ACM. REFER to AUDIO CONTROL MODULE (ACM) . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.