Diagnostic Routine AJ

Diagnostic Routine AJ

Diagnostic Overview

Poor Quality, Distorted Or No Sound While In SYNC Mode

Refer to Wiring Diagram Set 130 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

For more information about the SYNC(R) system, REFER to Overview .

The APIM (Accessory Protocol Interface Module) transmits left and right channel analog audio signals to the ACM (Audio Control Module). These signals include inputs from the USB (Universal Serial Bus) port, the SD (Secure Digital) card slot, the RCA jack, and a Bluetooth media device. If a USB (Universal Serial Bus) mass storage device is used to play an audio file, the SYNC(R) system only plays audio files that do not have DRM (Digital Rights Management) protection.

Special Tool(s)






Pinpoint Test

1. VERIFY THE OPERATION OF THE SYNC(R) SYSTEM AUDIO SOURCES

1. Connect: 105-00120.

2. Using the 105-00120 and 105-00121 , test the audio output for the RCA jack, USB (Universal Serial Bus) port and Bluetooth.

Is there poor quality/distorted/no sound from each SYNC(R) audio source?








2. CHECK THE AUDIO CIRCUITS FROM THE APIM FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: ACM (Audio Control Module) C240B.

3. Disconnect: APIM (Accessory Protocol Interface Module).

4. Ignition ON.

5. Measure:





Is any voltage present?








3. CHECK THE CIRCUITS FROM THE APIM (Accessory Protocol Interface Module) FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








4. CHECK THE CIRCUITS FROM THE APIM (Accessory Protocol Interface Module) FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








5. CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION

1. Disconnect and inspect the APIM (Accessory Protocol Interface Module) connector.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect the APIM (Accessory Protocol Interface Module) connector. Make sure it seats and latches correctly.

4. Wait 2 minutes for the APIM (Accessory Protocol Interface Module) to re-initialize.

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

Is the concern still present?








6. CHECK FOR CORRECT ACM (Audio Control Module) OPERATION

1. Disconnect and inspect all ACM (Audio Control Module) connectors.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect the ACM (Audio Control Module) connectors Make sure they seat and latch correctly.

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

Is the concern still present?