Pinpoint Test AO: DTC U0238

Instrumentation and Warning Chimes

Pinpoint Tests

Pinpoint Test AO: DTC U0238

- DTC U0238 (Lost Communication With Digital Audio Control Module "D" [ DSP]) - sets in continuous memory if data messages received from the Speech Recognition Module (SRM) over the Medium Speed Controller Area Network (MS-CAN) are missing for greater than 5 seconds.

This pinpoint test is intended to diagnose the following:

- SRM
- Instrument Cluster (IC)


PINPOINT TEST AO: DTC U0238

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AO1 VERIFY THE CUSTOMER CONCERN


- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to AO2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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AO2 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the SRM pass the network test?

Yes
GO to AO3.

No
REFER to Module Communications Network Testing and Inspection.

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AO3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?

Yes
GO to Pinpoint Test AG (B1317) or GO to Pinpoint Test AH (B1318). Pinpoint Test AG: DTC B1317 Pinpoint Test AH: DTC B1318

No
GO to AO4.

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AO4 RECHECK THE IC DTCs


- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0238 still present?

Yes
INSTALL a new SRM Speech Recognition Module (SRM). REFER to Information and Entertainment Systems Service and Repair. CLEAR the DTCs REPEAT the IC self-test.

If DTC U0238 is still present, INSTALL a new IC. REFER to Instrument Cluster (IC) Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic.

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