Pinpoint Test M: The Audio Input Jack Is Inoperative/Does Not Operate Correctly
Information and Entertainment System
Pinpoint Tests
Pinpoint Test M: The Audio Input Jack Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagrams Set 130, Audio System for schematic and connector information. Diagrams By Number
Normal Operation - Vehicles Without the SYNC System
Audio signals are sent from the audio input jack to the Audio Control Module (ACM). There are no external power or ground circuits to the audio input jack.
Vehicles With the SYNC System
Audio signals are sent from the audio input jack to the Accessory Protocol Interface Module (APIM). The signals are then sent to the ACM. There are no external power or ground circuits to the audio input jack.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Audio input jack
- ACM
- APIM (if equipped)
PINPOINT TEST M: THE AUDIO INPUT JACK IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Before carrying out this pinpoint test, make sure the MP3 device is operating correctly.
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M1 CHECK THE AUDIO INPUT JACK AUDIO
- Connect: Multi-Media Interface Tester.
- Using the Multi-Media Interface Tester, attempt to play a file using the audio input jack.
- Does the file play correctly?
Yes
The system is operating correctly at this time. The concern may be with the customer device.
No
GO to M2.
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M2 DETERMINE THE VEHICLE CONTENT
- Determine if the vehicle is equipped with the SYNC system.
- Is the vehicle equipped with the SYNC system?
Yes
GO to M3.
No
GO to M4.
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M3 CHECK THE APIM AUDIO OUTPUT
- Using the Multi-Media Interface Tester, attempt to play an audio file using either the Universal Serial Bus (USB) port or Bluetooth.
- Is the audio output OK for the USB port or Bluetooth?
Yes
GO to M4.
No
Go To Pinpoint Test O. Pinpoint Test O: The SYNC System Is Completely Inoperative
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M4 CHECK THE AUDIO INPUT JACK CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Audio Input Jack C2401.
- Disconnect: ACM C240b or APIM C2298 (If Equipped).
- Ignition ON.
- Measure the voltage between the audio input jack, 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 M5.
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M5 CHECK THE AUDIO INPUT JACK CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the audio input jack, harness side and ground as follows:
- Is the resistance greater than 10,000 ohms?
Yes
GO to M6.
No
REPAIR the circuit in question. TEST the system for normal operation.
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M6 CHECK THE AUDIO INPUT JACK CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between the audio input jack, harness side and the ACM (or APIM, if equipped), harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to M7.
No
REPAIR the circuit in question. TEST the system for normal operation.
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M7 ISOLATE THE AUDIO INPUT JACK
- Install a new audio input jack. Refer to Audio Input Jack Service and Repair.
- Operate the audio system using a device plugged into the audio input jack.
- Does the system operate correctly?
Yes
The concern was caused by an inoperative audio input jack. The system is now operating correctly.
No
GO to M8.
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M8 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- Connect: Audio Input Jack C2401.
- Connect: APIM C2298 (If Equipped).
- 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 determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) Audio Control Module (ACM). TEST the system for normal operation. If the vehicle is equipped with SYNC and the concern is still present, GO to M9.
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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M9 CHECK FOR CORRECT APIM OPERATION
- 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 determine if 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.
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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