Pinpoint Test AC: DTC U0193

Information and Entertainment System

Pinpoint Tests

Pinpoint Test AC: DTC U0193

Normal Operation

Several audio system modules receive network messages from the Satellite Digital Audio Receiver System (SDARS) module via the Medium Speed Controller Area Network (MS-CAN).

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 U0193 (Lost Communication With Digital Audio Control Module ( SDARS)) - set by the non-navigation Audio Control Module (ACM) when network messages are missing from the SDARS 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
- SDARS module


PINPOINT TEST AC: DTC U0193

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AC1 CHECK THE ACM 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 may not have been carried out.

- Clear the ACM DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Repeat the ACM self-test.
- Is DTC U0193 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.

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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 wiring between the SDARS module and the ACM for an intermittent fault.

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AC3 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- Carry out the network test using the scan tool.
- Does the ACM pass the network test?

Yes
GO to AC4.

No
REFER to Module Communications Network Testing and Inspection.

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AC4 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs


- Carry out the self-test for the following modules:
- ACM
- SDARS module
- Is DTC U3003:16 or DTC U3003:17 recorded in either module?

Yes
REFER to DTC Charts. Information and Entertainment Systems

No
INSTALL a new ACM. REFER to Audio Control Module (ACM) Audio Control Module (ACM). CLEAR the ACM DTCs. REPEAT the ACM self-test.

If DTC U0193 is still present, INSTALL a new SDARS module. REFER to Satellite Digital Audio Receiver System (SDARS) Module Service and Repair. TEST the system for normal operation.

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