Pinpoint Test AA: DTC U0140:00

Climate Control System

Pinpoint Tests

Pinpoint Test AA: DTC U0140:00

Normal Operation
- DTC U0140:00 (Lost Communication With Body Control Module: No Sub-Type Information) - sets in continuous memory in the HVAC module if data messages received from the Body Control Module (BCM) over the Medium Speed Controller Area Network (MS-CAN) are missing for 5 seconds or more. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:

- BCM
- HVAC module

PINPOINT TEST AA: DTC U0140:00

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AA1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to AA2.

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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AA2 CHECK THE COMMUNICATION NETWORK

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

Yes
GO to AA3.

No
REFER to Module Communications Network Testing and Inspection.

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AA3 RETRIEVE THE RECORDED DTCs FROM THE BCM SELF-TEST

- Check for recorded DTCs from the BCM self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
Multifunction Electronic Modules Multifunction Electronic Modules.

No
GO to AA4.

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AA4 RETRIEVE THE RECORDED DTCs FROM THE HVAC MODULE SELF-TEST

- Check for recorded DTCs from the HVAC module self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
GO to Pinpoint Test H. Pinpoint Test H: DTC U3003:16 or U3003:17

No
GO to AA5.

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AA5 RECHECK THE HVAC MODULE DTCs

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the HVAC module self-test.
- Is DTC U0140:00 still present?

Yes
GO to AA6.

No
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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AA6 CHECK FOR DTC U0140:00 SET IN OTHER MODULES

- Clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0140:00 set in the Driver Seat Module (DSM)?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new HVAC module. REFER to Climate Control Service and Repair. TEST the system for normal operation.

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