Pinpoint Tests AR: DTC U0238:00

Information and Entertainment System

Pinpoint Test AR: DTC U0238:00

- DTC U0238:00 (Lost Communication With Digital Audio Control Module "D": No Sub Type Information) - set by the Audio Control Module (ACM) 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 RUN.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- Audio DSP module
- ACM

PINPOINT TEST AR: DTC U0238:00

-------------------------------------------------
AR1 CHECK FOR LOST COMMUNICATION 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.

- 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 U0238:00 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 an intermittent fault in the network wiring.

-------------------------------------------------
AR2 VERIFY THE CUSTOMER CONCERN

- Operate the audio system in radio tuner (AM/FM) mode.
- Verify there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to AR3.

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.

-------------------------------------------------
AR3 CHECK THE COMMUNICATION NETWORK

- Carry out the network test using the scan tool.
- Does the audio DSP module pass the network test?

Yes
GO to AR4.

No
REFER to The Audio DSP Module Does Not Respond To The Scan Tool in Module Communications Network Testing and Inspection.

-------------------------------------------------
AR4 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs

- Carry out the self-test for the following modules:
- ACM
- Audio DSP module
- Are any low or high voltage DTCs 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 DTCs. REPEAT the ACM self-test.

If U0238:00 is still present in the ACM, INSTALL a new ACM. REFER to Audio Control Module (ACM) Audio Control Module (ACM). TEST the system for normal operation.

-------------------------------------------------