Pinpoint Test R: Poor Quality/Distorted/No Sound While In SYNC(R) Mode (Late Build)
Information and Entertainment System
Pinpoint Test R: Poor Quality/Distorted/No Sound While In SYNC(R) Mode (Late Build)
Refer to Wiring Diagrams Set 130, Audio System/Navigation for schematic and connector information. Electrical Diagrams
Normal Operation
The Accessory Protocol Interface Module (APIM) sends left and right channel analog audio signals to the Audio Front Control Module (ACM). This includes inputs from the Universal Serial Bus (USB) port, audio input jack, and a Bluetooth media device.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- APIM (Accessory Protocol Interface Module)
- ACM (Audio Front Control Module)
PINPOINT TEST R : POOR QUALITY/DISTORTED/NO SOUND WHILE IN SYNC(R) MODE (LATE BUILD)
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
R1 VERIFY THE OPERATION OF THE SYNC(R) 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 (Universal Serial Bus) port, and Bluetooth connection.
Is there poor quality/distorted/no sound from each SYNC(R) audio source?
Yes
GO to R2.
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. Symptom Related Diagnostic Procedures
If all audio sources operate correctly, the concern is with the customer device.
R2 CHECK THE CIRCUITS FROM THE APIM (Accessory Protocol Interface Module) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM (Audio Front Control Module) C290B.
- Disconnect: APIM (Accessory Protocol Interface Module) C2383.
- Ignition ON.
- Measure the voltage between the APIM (Accessory Protocol Interface Module), harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C2383-23 Ground 10-MD27 (BN/RD) C2383-24 Ground 9-MD27 (BU/RD) C2383-25 Ground 8-MD27 (GY/RD) C2383-26 Ground 91-MD27 (YE/RD)
Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to R3.
R3 CHECK THE CIRCUITS FROM THE APIM (Accessory Protocol Interface Module) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the APIM (Accessory Protocol Interface Module), harness side, and the ACM (Audio Front Control Module), harness side; and between the APIM (Accessory Protocol Interface Module), harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C2383-23 C290B-9, then ground 10-MD27 (BN/RD) C2383-24 C290B-10, then ground 9-MD27 (BU/RD) C2383-25 C290B-1, then ground 8-MD27 (GY/RD) C2383-26 C290B-2, then ground 91-MD27 (YE/RD)
Are the resistances less than 3 ohms between the APIM (Accessory Protocol Interface Module) and the ACM (Audio Front Control Module), and greater than 10,000 ohms between the APIM (Accessory Protocol Interface Module) and ground?
Yes
GO to R4.
No
REPAIR the circuit in question. TEST the system for normal operation.
R4 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION
- Connect: All Disconnected Connectors.
- Disconnect the APIM (Accessory Protocol Interface Module) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the APIM (Accessory Protocol Interface Module) connector and make sure it seats correctly.
- Wait 2 minutes for the APIM (Accessory Protocol Interface Module) to re-initialize.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new APIM (Accessory Protocol Interface Module). REFER to Accessory Protocol Interface Module (APIM) . TEST the system for normal operation. If the concern is still present, GO to R5.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
R5 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION
- Disconnect all the ACM (Audio Front Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM (Audio Front Control Module) 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 (Audio Front Control Module). 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.