Pinpoint Test AR: DTC U0238 Or DTC U0238:00
Information and Entertainment System
Pinpoint Tests
Pinpoint Test AR: DTC U0238 Or DTC U0238:00
Normal Operation
Some audio system modules receive network messages from the audio Digital Signal Processing (DSP) module via the Medium Speed Controller Area Network (MS-CAN). These messages consist mainly of audio setting information.
As more than one module receives each of these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.
- DTC U0238 (Lost Communication With Digital Audio Control Module "D" (DSP)) - set by the non-navigation Audio Control Module (ACM) or the Front Display Interface Module (FDIM) when network messages are missing from the audio DSP module for greater than 5 seconds with the ignition in RUN.
- DTC U0238:00 (Lost Communication With Digital Audio Control Module "D": No Sub Type Information) - set by the navigation ACM when network messages are missing from the audio DSP module for greater than 5 seconds with the ignition in RUN.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- Audio system concern
- Audio DSP module
PINPOINT TEST AR: DTC U0238 OR DTC U0238:00
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AR1 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 U0238 or U0238:00 set in any audio system module?
Yes
GO to AR2.
No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
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AR2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM
- Audio DSP module
- FDIM
- Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?
Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
No
GO to AR3.
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AR3 CHECK FOR DTC U0238 OR U0238:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
- Is DTC U0238 or DTC U0238:00 set in more than one audio system module?
Yes
GO to AR4.
No
If there is an observable symptom, GO to Symptom Chart - General Audio System to diagnose the observed symptom. Symptom Chart - General Audio System
If there is no observable symptom, DISREGARD the DTC.
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AR4 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION
- Disconnect all the audio DSP module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the audio DSP module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new audio DSP module. REFER to Audio Digital Signal Processing (DSP) Module Audio Digital Signal Processing (DSP) Module. 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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