Pinpoint Test P: DTC U0140:00

Information and Entertainment System

Pinpoint Test P: DTC U0140:00

Normal Operation

Several audio system modules receive network messages from the Body Control Module (BCM) via the Medium Speed Controller Area Network (MS-CAN). The following information is included in the messages:

- Light and chime request
- Illumination dimmer control

As more than one module receives these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

- DTC U0140:00 (Lost Communication With Body Control Module: No Sub Type Information) - set by the Audio Control Module (ACM), the Front Control/Display Interface Module (FCDIM), the Accessory Protocol Interface Module (APIM), or the Global Positioning System Module (GPSM) when network messages are missing from the BCM 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
- BCM

PINPOINT TEST P: DTC U0140:00

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P1 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 U0140:00 set in any audio system module?

Yes
GO to P2.

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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P2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs

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

Yes
For an audio system module, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

For the BCM, REFER to Multifunction Electronic Modules Testing and Inspection.

No
GO to P3.

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P3 CHECK FOR DTC U0140:00 SET IN MULTIPLE MODULES

- Review the recorded results from the self-test.
- Is DTC U0140:00 set in more than one audio system module?

Yes
If all audio system modules except the FCDIM set DTC U0140:00, INSTALL a new FCDIM. REFER to Front Controls/Display Interface Module (FCDIM) Front Controls/Display Interface Module (FCDIM). TEST the system for normal operation.

Otherwise, GO to P4.

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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P4 CHECK FOR CORRECT BCM OPERATION

- Ignition OFF.
- Disconnect all the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pints
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). 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 U0140:00.

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