Pinpoint Test H: Poor Quality/Distorted/No Sound - SYNC(R) System
Information and Entertainment System
Pinpoint Test H: Poor Quality/Distorted/No Sound - SYNC(R) System
Refer to Wiring Diagram Set 130 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Audio System/Navigation for schematic and connector information. Diagrams By Number
Normal Operation
The Accessory Protocol Interface Module (APIM) sends left and right channel analog audio signals to the Audio Control Module (ACM). This includes inputs from the Universal Serial Bus (USB) port, the audio input jack, and a Bluetooth media device.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- APIM
- ACM
PINPOINT TEST H: POOR QUALITY/DISTORTED/NO SOUND - SYNC(R) SYSTEM
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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H1 VERIFY THE OPERATION OF THE SYNC(R) SYSTEM AUDIO SOURCES
- Connect: Multi-Media Interface Tester .
- Using the Multi-Media Interface Tester, test the audio output for the audio input jack, USB port, and Bluetooth connection.
- Is there poor quality/distorted/no sound from each SYNC(R) audio source?
Yes
GO to H2.
No
If the concern is only with some (but not all) of the audio sources, GO to Symptom Chart - SYNC(R) System to diagnose the observed symptom. Symptom Chart - SYNC(R) System
If all audio sources operate correctly, the concern is with the customer device.
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H2 CHECK THE CIRCUITS FROM THE APIM FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM C240c .
- Disconnect: APIM C3338 .
- Measure the voltage between the APIM, harness side and ground as follows:
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to H3.
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H3 CHECK THE CIRCUITS FROM THE APIM FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the ACM, harness side, and the APIM, harness side; and between the ACM, harness side and ground as follows:
- Is the resistance less than 5 ohms between the ACM and the APIM, and greater than 10,000 ohms between the ACM and ground?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to H4.
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H4 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) Accessory Protocol Interface Module (APIM). TEST the system for normal operation. If the concern is still present, GO to H5.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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H5 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) - Fusion, Milan Audio Control Module (ACM) or Audio Control Module (ACM) - MKZ 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.
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