Pinpoint Test G: The Audio Input Jack Is Inoperative/Does Not Operate Correctly - Audio Units With External Audio Input Jack

Information and Entertainment System

Pinpoint Tests

Pinpoint Test G: The Audio Input Jack Is Inoperative/Does Not Operate Correctly - Audio Units With External Audio Input Jack

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

Normal Operation

Audio signals are sent from the audio input jack to the audio unit. 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
- Audio unit



PINPOINT TEST G: THE AUDIO INPUT JACK IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - AUDIO UNITS WITH EXTERNAL AUDIO INPUT JACK

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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G1 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 G2.

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G2 CHECK THE AUDIO INPUT JACK CIRCUITS FOR AN OPEN OR SHORT TO GROUND


- Ignition OFF.
- Disconnect: Audio Unit C290c.
- Measure the resistance between the audio input jack, harness side and the audio unit, 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 audio unit, and greater than 10,000 ohms between the audio input jack and ground?

Yes
GO to G3.

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

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G3 SUBSTITUTE THE AUDIO INPUT JACK


- Install a known good audio input jack.
- Operate the audio unit in auxiliary audio mode.
- Does the system operate correctly?

Yes
INSTALL a new audio input jack. TEST the system for normal operation.

No
INSTALL the original audio input jack. INSTALL a new audio unit. REFER to Audio Unit Audio Unit. TEST the system for normal operation.

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