Pinpoint Test Q: DTC U0253:00

Information and Entertainment System

Pinpoint Test Q: DTC U0253:00

- DTC U0253:00 (Lost Communication With Accessory Protocol Interface Module: No Sub Type Information) - set by the Audio Control Module (ACM) when network messages are missing from the Accessory Protocol Interface Module (APIM) 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 system concern
- APIM

PINPOINT TEST Q: DTC U0253:00

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Q1 CHECK FOR LOST COMMUNICATION DTCs

- 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 U0253:00 or DTC U0197:00 set in any module?

Yes
GO to Q2.

No
The system is operating correctly at this time. The DTC may been set due to an intermittent fault in the network wiring.

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Q2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs

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

Yes
REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

No
GO to Q3.

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Q3 CHECK FOR DTC U0253:00 OR DTC U0197:00 SET IN MULTIPLE MODULES

- Review the recorded results from the self-test.
- Are DTC U0253:00 or DTC U0197:00 set in more than one module?

Yes
GO to Q4.

No
If there is an observable symptom, GO to Symptom Chart - General Audio System to diagnose the observed symptom. Symptom Chart - General Audio System

If there is no observable symptom, the system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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Q4 CHECK FOR CORRECT APIM OPERATION

- Ignition OFF.
- Disconnect the APIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pints
- Connect the APIM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new APIM. REFER to Accessory Protocol Interface Module (APIM) Accessory Protocol Interface Module (APIM). CLEAR all continuous DTCs. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test for the module(s) that set DTC U0197:00 or DTC U0253:00.

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