Pinpoint Test N: The Audio Input Jack Is Inoperative/Does Not Operate Correctly

Information and Entertainment System

Pinpoint Tests

Pinpoint Test N: The Audio Input Jack Is Inoperative/Does Not Operate Correctly

Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number

Normal Operation

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.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Audio input jack
- ACM



PINPOINT TEST N: 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, be sure the MP3 device is operating correctly.

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N1 CHECK THE AUDIO INPUT JACK AUDIO


- Connect: Known Good MP3 Device (To Audio Input Jack).
- Using the known good device, attempt to play an audio file.
- Does the audio file play correctly?

Yes
The system is operating correctly at this time. The concern may be with the customer device.

No
GO to N2.

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N2 CHECK THE AUDIO INPUT JACK CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: Audio Input Jack C3312.
- 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 N3.

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N3 CHECK THE AUDIO INPUT JACK CIRCUITS FOR AN OPEN OR SHORT TO GROUND


- Ignition OFF.
- Disconnect: ACM C290a.
- Measure the resistance between the audio input jack, harness side and the ACM, harness side; and between the audio input jack, harness side and ground as follows:





- Is the resistance less than 5 ohms between the audio input jack and the ACM, and greater than 10,000 ohms between the audio input jack and ground?

Yes
GO to N4.

No
REPAIR the circuit in question. TEST the system for normal operation.

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N4 ISOLATE THE AUDIO INPUT JACK


- Install a new audio input jack.
- Connect: Known Good MP3 Device (To Audio Input Jack).
- Using the known good device, attempt to play an audio file.
- Does the audio file play correctly?

Yes
The system is operating correctly at this time. The concern was caused by an inoperative audio input jack.

No
GO to N5.

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N5 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 determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new ACM. REFER to Audio Control Module (ACM) Removal and Replacement. 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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