Pinpoint Test AC: DTC U0238 Or DTC U0238:00
Information and Entertainment System
Pinpoint Test AC: DTC U0238 Or DTC U0238:00
Normal Operation
- DTC U0238 (Lost Communication With Digital Audio Module "D")- set by the Front Display Interface Module (FDIM) when the status messages from the audio Digital Signal Processing (DSP) module are missing for greater than 5 seconds with the ignition in RUN. This results in no information from the audio DSP (Digital Signal Processing) module being shown on the FDIM (Front Display Interface Module) display.
- DTC U0238:00 (Lost Communication With Digital Audio Control Module "D": No Sub Type Information)- set by the Audio Front Control Module (ACM) when the status messages from the audio DSP (Digital Signal Processing) module are missing for greater than 5 seconds with the ignition in RUN. This can cause various symptoms, including poor sound quality.
This pinpoint test is intended to diagnose the following:
- Communication network concern
- ACM (Audio Front Control Module)
- FDIM (Front Display Interface Module)
- Audio DSP (Digital Signal Processing) module
PINPOINT TEST AC : DTC U0238 OR DTC U0238:00
AC1 CHECK THE ACM (Audio Front Control Module) 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 PMI (Programmable Module Installation) may not have been carried out.
- Clear the ACM (Audio Front Control Module) or FDIM (Front Display Interface Module) DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the ACM (Audio Front Control Module) or FDIM (Front Display Interface Module) self-test.
Is DTC U0238 or DTC U0238:00 still present?
Yes
GO to AC2.
No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.
AC2 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify that there is an observable symptom present.
Is an observable symptom present?
Yes
GO to AC3.
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 (Medium Speed Controller Area Network) wiring between the audio DSP (Digital Signal Processing) module and the module in question for an intermittent fault.
AC3 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Carry out the network test using the scan tool.
Does the audio DSP (Digital Signal Processing) module pass the network test?
Yes
GO to AC4.
No
REFER to Information Bus.
AC4 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Carry out the self-test for the following modules:
- ACM (Audio Front Control Module)
- FDIM (Front Display Interface Module)
- Audio DSP (Digital Signal Processing) module
Is DTC B1316, B1317, U3003:16 or U3003:17 recorded in any module?
Yes
REFER to DTC Charts. Accessories and Optional Equipment
No
INSTALL a new audio DSP (Digital Signal Processing) module. REFER to Audio Digital Signal Processing (DSP) Module - Split Bench or Audio Digital Signal Processing (DSP) Module - Front Captain's Chair . CLEAR the ACM (Audio Front Control Module) or FDIM (Front Display Interface Module) DTCs. REPEAT the ACM (Audio Front Control Module) or FDIM (Front Display Interface Module) self-test.
If DTC U0238:00 is still present in the ACM (Audio Front Control Module), INSTALL a new ACM (Audio Front Control Module). REFER to Audio Control Module (ACM) . TEST the system for normal operation.
If DTC U0238 is still present in the FDIM (Front Display Interface Module), INSTALL a new FDIM (Front Display Interface Module). REFER to Front Display Interface Module (FDIM) . TEST the system for normal operation.