Pinpoint Test AL: DTC U0238 Or DTC U0238:00
Information and Entertainment System
Pinpoint Test AL: DTC U0238 Or DTC U0238:00
Normal Operation
- DTC U0238 (Lost Communication With Digital Audio Control Module "D" ( DSP)) - set by the non-navigation Audio Control Module (ACM) (Fusion, Milan) or the Front Display Interface Module (FDIM) when network messages are missing from the audio Digital Signal Processing (DSP) module over the Medium Speed Controller Area Network (MS-CAN) for greater than 5 seconds with the ignition in the RUN position.
- DTC U0238:00 (Lost Communication With Digital Audio Control Module "D": No Sub Type Information) - set by the non-navigation ACM (MKZ) or the navigation ACM when network messages are missing from the audio DSP module over the MS-CAN for greater than 5 seconds with the ignition in the RUN position.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- ACM
- FDIM
- APIM
PINPOINT TEST AL: DTC U0238 OR DTC U0238:00
NOTE: Only the non-navigation FDIM can set DTC U0238. Disregard the pinpoint test steps for the FDIM if the concern is on a vehicle with navigation.
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AL1 CHECK THE ACM AND FDIM DTCs
NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during Programmable Module Installation (PMI) or the PMI may not have been carried out.
- Clear the APIM and FDIM DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the APIM and FDIM self-tests.
- Is DTC U0238 or DTC U0238:00 still present?
Yes
GO to AL2.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
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AL2 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?
Yes
GO to AL3.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring. CHECK the MS-CAN wiring between the audio DSP module and the module in question for an intermittent fault.
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AL3 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Carry out the network test using the scan tool.
- Does the audio DSP module pass the network test?
Yes
GO to AL4.
No
REFER to Module Communications Network Testing and Inspection.
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AL4 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM
- Audio DSP module
- FDIM
- Is DTC B1316, B1317, U3003:16 or U3003:17 recorded in any module?
Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
No
INSTALL a new audio DSP module. REFER to Audio Digital Signal Processing (DSP) Module Audio Digital Signal Processing (DSP) Module. CLEAR the ACM and FDIM DTCs. REPEAT the ACM and FDIM self-tests.
If DTC U0238:00 is still present in the ACM, INSTALL a new ACM. REFER to Audio Control Module (ACM) - Fusion, Milan Audio Control Module (ACM) or Audio Control Module (ACM) - MKZ Audio Control Module (ACM). TEST the system for normal operation.
If DTC U0238:00 is still present in the FDIM, INSTALL a new FDIM. REFER to Front Display Interface Module (FDIM) - Fusion, Milan Front Display Interface Module (FDIM) or Front Display Interface Module (FDIM) - MKZ Front Display Interface Module (FDIM). TEST the system for normal operation.
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