Pinpoint Test S: DTC U0140:00

Climate Control System

Pinpoint Test S: 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 High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or more. For a complete list of all network messages, refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- BCM (Body Control Module)

- HVAC module

PINPOINT TEST S : DTC U0140:00

S1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to S2.

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.

S2 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 (Body Control Module) pass the network test?

Yes
GO to S3.

No
REFER to Information Bus.

S3 RETRIEVE THE RECORDED DTCs FROM THE BCM (Body Control Module) SELF-TEST

- Check for recorded DTCs from the BCM (Body Control Module) self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
REFER to Body Control Systems.

No
GO to S4.

S4 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 G Pinpoint Test G: DTCs U3003:16 and 17.

No
GO to S5.

S5 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 (Programmable Module Installation) 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 S6.

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.

S6 CHECK FOR DTC U0140 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 set in the Driver Seat Module (DSM)?

Yes
INSTALL a new BCM (Body Control Module). CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new HVAC module. TEST the system for normal operation.