Pinpoint Test Q: An Individual Audio Control Module (ACM) Touchscreen Display/Function Is Inoperative/Does Not Operate Correctl
Information and Entertainment System
Pinpoint Tests
Pinpoint Test Q: An Individual Audio Control Module (ACM) Touchscreen Display/Function Is Inoperative/Does Not Operate Correctly - Vehicles With Navigation
Normal Operation
The Audio 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)
- HVAC module: climate control system information
If the ACM loses the signal from any of these modules, only that specific display is inoperative.
Because the satellite radio receiver is internal to the ACM, all satellite radio information on the display is directly generated by the ACM.
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 signal. GO to Pinpoint Test H. Pinpoint Test H: No Global Positioning System (GPS) Antenna Signal
This pinpoint test is intended to diagnose the following:
- Communication network concern
- ACM
PINPOINT TEST Q: AN INDIVIDUAL ACM TOUCHSCREEN DISPLAY/FUNCTION IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - VEHICLES WITH NAVIGATION
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Q1 OBSERVE THE ACM DISPLAY
- Turn the audio system on and observe the ACM screen.
- Is the ACM display completely inoperative?
Yes
GO to Pinpoint Test P. Pinpoint Test P: The Audio Control Module (ACM) Does Not Respond To Touchscreen Or Button Presses
No
GO to Q2.
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Q2 CHECK THE ACM DISPLAY SEGMENTS
- Enter the following diagnostic mode on the scan tool: Audio Display Test.
- Follow the scan tool instructions to carry out the Audio Display Test.
- Do all of the ACM segments illuminate?
Yes
GO to Q3.
No
GO to Q5.
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Q3 OBSERVE THE SPECIFIC INOPERATIVE DISPLAY
- Observe the inoperative ACM display while carrying out the indicated diagnostic method as follows:
- Does the inoperative display confirm the expected results?
Yes
The system is operating correctly at this time. INFORM the customer on the correct operation of the ACM displays.
No
GO to Q4.
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Q4 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs (from all modules).
- Is DTC U0164, U0184 or U0197 (if equipped with the SYNC(R) system) present in any module?
Yes
REFER to DTC Charts. Information and Entertainment Systems
No
GO to Q5.
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Q5 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- 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) 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.
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