Pinpoint Test AR: DTC U0238 Or DTC U0238:00

Information and Entertainment System

Pinpoint Test AR: DTC U0238 Or DTC U0238:00

- DTC U0238 (Lost Communication With Digital Audio Control Module "D" (DSP (Digital Signal Processing)))- 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 (Digital Signal Processing) module over the Medium Speed Controller Area Network (MS-CAN) 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 (Audio Control Module) when network messages are missing from the audio DSP (Digital Signal Processing) module over the MS-CAN (Medium Speed Controller Area Network) for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following:

- Communication network concern

- Audio DSP (Digital Signal Processing) module

- ACM (Audio Control Module)

- FDIM (Front Display Interface Module)

PINPOINT TEST AR : DTC U0238 OR 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 (Programmable Module Installation) 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 or 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 (Medium Speed Controller Area Network) wiring between the audio DSP (Digital Signal Processing) 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 (Digital Signal Processing) module pass the network test?

Yes
GO to AR4.

No
REFER to The Audio DSP (Digital Signal Processing) Module Does Not Respond To The Scan Tool in Information Bus.

AR4 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs

- Carry out the self-test for the following modules:
- ACM (Audio Control Module)

- Audio DSP (Digital Signal Processing) module

- FDIM (Front Display Interface Module)

Are any low or high voltage DTCs 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 . CLEAR the ACM (Audio Control Module) (all vehicles) and FDIM (Front Display Interface Module) (without navigation only) DTCs. REPEAT the ACM (Audio Control Module) (all vehicles) and FDIM (Front Display Interface Module) (without navigation only) self-tests.

If DTC U0238 or U0238:00 is still present in the ACM (Audio Control Module), INSTALL a new ACM (Audio 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.