Pinpoint Test Z: The Audio Front Control Module (ACM) Touchscreen Display Is Inoperative/Does Not Operate Correctly - Vehicles
Information and Entertainment System
Pinpoint Test Z: The Audio Front Control Module (ACM) Touchscreen Display Is Inoperative/Does Not Operate Correctly - Vehicles With Navigation
Normal Operation
The Audio Front Control Module (ACM) receives inputs via the Medium Speed Controller Area Network (MS-CAN) from the following modules:
- Accessory Protocol Interface Module (APIM) : SYNC(R) system information (if equipped)
If the ACM (Audio Front Control Module) loses the signal from any of these modules, only that specific display is inoperative.
Because the satellite radio receiver is internal to the ACM (Audio Front Control Module), all satellite radio information on the display is directly generated by the ACM (Audio Front Control Module).
The compass heading is derived from the Global Positioning System (GPS) antenna. If there is a concern with the compass display, there should also be a concern with the GPS (Global Positioning System) signal. GO to Pinpoint Test N. Pinpoint Test N: No Global Positioning System (GPS) Antenna Signal
This pinpoint test is intended to diagnose the following:
- Communication network concern
- ACM (Audio Front Control Module)
PINPOINT TEST Z : THE ACM (Audio Front Control Module) TOUCHSCREEN DISPLAY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - VEHICLES WITH NAVIGATION
Z1 OBSERVE THE ACM (Audio Front Control Module) DISPLAY
- Turn the audio system on and observe the ACM (Audio Front Control Module) screen.
Is the ACM (Audio Front Control Module) display completely inoperative?
Yes
GO to Z4.
No
GO to Z2.
Z2 CHECK THE ACM (Audio Front Control Module) DISPLAY SEGMENTS
- Carry out the Audio Display Test. Refer to Audio Control Module (ACM) Self-Diagnostic Mode Service and Repair.
Do all of the ACM (Audio Front Control Module) segments operate correctly?
Yes
GO to Z3.
No
GO to Z5.
Z3 OBSERVE THE SPECIFIC INOPERATIVE DISPLAY
- Observe the inoperative ACM (Audio Front Control Module) display while carrying out the indicated diagnostic method as follows:
Inoperative Display Diagnostic Method Expected Results Audio system Turn the audio system on, press the RADIO button, and adjust the audio settings using the touchscreen. The ACM (Audio Front Control Module) changes the setting and updates the display to show the change in audio setting. Satellite radio system Turn the audio system on, press the MEDIA button until satellite radio mode is entered, and adjust the settings using the touchscreen. The ACM (Audio Front Control Module) changes the setting and updates the display to show the change in satellite radio setting. SYNC(R) system (if equipped) Turn the audio system on, press the PHONE button, and attempt several functions using the touchscreen. The ACM (Audio Front Control Module) display shows information relating to the phone.
Does the inoperative display confirm the expected results?
Yes
The system is operating correctly at this time. INFORM the customer on the operation of the ACM (Audio Front Control Module) displays.
No
GO to Z4.
Z4 CHECK FOR LOST COMMUNICATION DTCs
NOTE: Audio system lost communication DTCs include U0184, U0184:00, 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 Z5.
Z5 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.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.