Pinpoint Test Y: The Audio Front Control Module (ACM) Does Not Respond To Touchscreen Or Button Presses

Information and Entertainment System

Pinpoint Test Y: The Audio Front Control Module (ACM) Does Not Respond To Touchscreen Or Button Presses

Normal Operation

When a button is pressed on the Audio Front Control Module (ACM) (whether it is a hard button or the touchscreen), a signal is sent over the Medium Speed Controller Area Network (MS-CAN) to the modules in the audio system.

- DTC B2924 (Audio Button Stuck)- sets in continuous memory when an ACM (Audio Front Control Module) hard button is stuck for longer than 2 minutes, or during the on-demand self-test if an ACM (Audio Front Control Module) hard button is detected as active for any duration. Make sure no ACM (Audio Front Control Module) buttons are pressed during the self-test. This DTC applies to vehicles without navigation only.

- DTC U2013:63 (Switch Pack: Circuit / Component Protection Time-Out)- sets in continuous memory when an ACM (Audio Front Control Module) hard button is stuck for longer than 2 minutes, or during the on-demand self-test if an ACM (Audio Front Control Module) hard button is detected as active for any duration. Make sure no ACM (Audio Front Control Module) buttons are pressed during the self-test. This DTC applies to vehicles with navigation only.

This pinpoint test is intended to diagnose the following:

- Communication network concern

- ACM (Audio Front Control Module)

PINPOINT TEST Y : THE ACM (Audio Front Control Module) DOES NOT RESPOND TO TOUCHSCREEN OR BUTTON PRESSES

Y1 CHECK FOR LOST COMMUNICATION DTCs

NOTE: Audio system lost communication DTCs include U0184, U0184:00, U0193, U0193:00, U0196, U0196:00, U0197 and U0197:00.

- Using the scan tool, retrieve all continuous DTCs from all modules.

Are audio system lost communication DTCs present in any module?

Yes
REFER to DTC Charts. Accessories and Optional Equipment

No
GO to Y2.

Y2 CHECK FOR DTC B2924 OR DTC U2013:63

- Ignition ON.

- Clear the ACM (Audio Front Control Module) DTCs.

- Wait 3 minutes.

- Repeat the ACM (Audio Front Control Module) self-test, making sure that no buttons are pressed during the test.

Is DTC B2924 or DTC U2013:63 set in the ACM (Audio Front Control Module)?

Yes
INSTALL a new ACM (Audio Front Control Module). REFER to Audio Control Module (ACM) . TEST the system for normal operation.

No
GO to Y3.

Y3 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION

- Ignition OFF.

- Disconnect all the ACM (Audio Front Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the ACM (Audio Front Control Module) 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 (Audio Front Control Module). REFER to Audio Control Module (ACM) . TEST the system for normal operation. If the system still does not operate correctly.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.