Pinpoint Test H: The Audio System Does Not Operate Correctly From The Front Display Interface Module (FDIM) (Vehicles Without N

Information and Entertainment System

Pinpoint Tests

Pinpoint Test H: The Audio System Does Not Operate Correctly From The Front Display Interface Module (FDIM) (Vehicles Without Navigation)

Normal Operation

When a button is pressed on the Front Display Interface Module (FDIM), a message is sent to the Audio Control Module (ACM) via the Medium Speed Controller Area Network (MS-CAN). The ACM then takes the appropriate action.

- DTC B2924 (Audio Button Stuck) - sets when the FDIM detects a button as active for greater than 120 seconds during normal operation, or for any duration during the self-test. When this occurs, the FDIM disables that particular button until the fault is cleared, or until the next ignition cycle.
- DTC U0256:00 (Lost Communication With Front Display Interface Module: No Sub Type Information) - set by the ACM if it does not detect the FDIM for greater than 5 seconds with the ignition in the RUN position. When this occurs, the FDIM is inoperative and the FDIM may not display correct (if any) information.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- FDIM



PINPOINT TEST H: THE AUDIO SYSTEM DOES NOT OPERATE CORRECTLY FROM THE FDIM (VEHICLES WITHOUT NAVIGATION)

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H1 CHECK THE FDIM DTCs


- Carry out the FDIM self-test.
- Is DTC B2924 present?

Yes
INSTALL a new FDIM. REFER to Front Display Interface Module (FDIM) - Without Navigation Front Display Interface Module (FDIM) - Without Navigation.
TEST the system for normal operation.

No
GO to H2.

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H2 OBSERVE THE FDIM DISPLAY


- Turn the audio system on and observe the FDIM screen.
- Is the FDIM display completely inoperative?

Yes
Go To Pinpoint Test G. Pinpoint Test G: The Front Display Interface Module (FDIM) Is Completely Inoperative (Vehicles Without Navigation)

No
GO to H3.

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H3 CHECK FOR CORRECT FDIM OPERATION


- Ignition OFF.
- Disconnect the FDIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FDIM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new FDIM. REFER to Front Display Interface Module (FDIM) - Without Navigation Front Display Interface Module (FDIM) - Without Navigation.
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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