Pinpoint Test I : U0140:87
- Refer to Module Communications Network
for schematic and connector information.
Normal Operation and Fault Conditions
With the ignition ON, the BCM sends messages to the GWM over the HS-CAN1. The GWM sends these messages to the VDM over the HS-CAN2. If the VDM does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). For information on the messages sent to the VDM by the BCM, go to the Network Message Chart. REFER to: Vehicle Dynamic Suspension - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition VDM U0140:87 Lost Communication With Body Control Module: Missing Message This DTC sets in continuous memory if any one of the following messages is missing: ignition status, life cycle mode or vehicle configuration data. This can be due to a BCM failure, a circuit failure on the HS-CAN or an excessive load on the network. Possible Sources
- Wiring, terminals or connectors
- Network communication concern
- Vehicle battery
- Charging system concern
- GWM
- BCM
- I1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a diagnostic scan tool, carry out the Network Test.
Do both the BCM and the GWM pass the Network Test?
Yes GO to I2 No DIAGNOSE the BCM or GWM does not respond to the diagnostic scan tool. REFER to: Communications Network . - I2 CHECK THE VDM (VEHICLE DYNAMICS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, carry out the VDM self-test.
- Clear the Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Using a diagnostic scan tool, carry out the VDM self-test.
- Record the VDM Diagnostic Trouble Codes (DTCs).
Is DTC U0140:87 retrieved again?
Yes GO to I3 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. - I3 REVIEW THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE VDM (VEHICLE DYNAMICS CONTROL MODULE) SELF-TEST
- Check the recorded Diagnostic Trouble Codes (DTCs) from the VDM self-test.
Is DTC U3003:16 or U3003:17 present in the VDM?
Yes If DTC U3003:16 is present, GO to Pinpoint Test A If DTC U3003:17 is present, GO to Pinpoint Test B No GO to I4 - I4 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE GWM (GATEWAY MODULE A)
- Using a diagnostic scan tool, carry out the GWM self-test.
Are any Diagnostic Trouble Codes (DTCs) present in the GWM?
Yes DIAGNOSE the GWM Diagnostic Trouble Codes (DTCs). REFER to: Communications Network . No GO to I5 - I5 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) IN THE BCM (BODY CONTROL MODULE)
- Using a diagnostic scan tool, carry out the BCM self-test.
Are any Diagnostic Trouble Codes (DTCs) present in the BCM?
Yes DIAGNOSE the BCM Diagnostic Trouble Codes (DTCs). REFER to: Body Control Module (BCM) . No GO to I6 - I6 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERNNOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.
- Check the vehicle service history for recent service actions related to the BCM or VDM. If recent service history is found:
- verify the correct replacement module was installed.
- HVBOM may be used to verify correct part fitment.
- verify the configuration of replacement module was correct.
- re-configure the module using as-built data if prior configuration is suspect.
- verify the module was not obtained from a like vehicle and installed into customer vehicle.
- return the swapped module to source vehicle and obtain new replacement module.
- verify the correct replacement module was installed.
- Operate the system and determine if the observable symptom is still present.
Is the observable symptom still present?
Yes GO to I7 No The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration. - Check the vehicle service history for recent service actions related to the BCM or VDM. If recent service history is found:
- I7 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0140:XX SET IN OTHER MODULES
- Using a diagnostic scan tool, carry out the self-test for all modules.
Is DTC U0140:xx set in 1 or more modules in addition to the VDM?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no Technical Service Bulletins (TSBs) exist for this concern, INSTALL a new BCM module. Refer to BCM Guided Routine . No CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no Technical Service Bulletins (TSBs) exist for this concern, INSTALL a new VDM module. REFER to: Vehicle Dynamics Control Module (VDM)