Pinpoint Test BP: U020B:82

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
IPC U020B:82	Lost Communication With 'Door Control Module H': Alive/Sequence Counter Incorrect/Not Updated	Sets in continuous memory in the IPC if data messages received from the DCMH through the GWM are missing for 5 seconds or longer.

Possible Sources

Communication concern
GWM concern
DCMH concern
IPC concern

BP1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to BP2

No	CLEAR the DTC. The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

BP2 CHECK THE COMMUNICATION NETWORK
- Using a diagnostic scan tool, perform the network test.
Does the DCMH pass the network test?

Yes GO to BP3

No

BP3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Using a diagnostic scan tool, perform the IPC self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to Diagnostic Trouble Code (DTC) Chart .

No GO to BP4

BP4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes	Without SYNC 4, REFER to: Communications Network . or with SYNC 4, REFER to: Controller Area Network (CAN) Module Communications Network .

GO to BP5

BP5 PERFORM THE DCMH (DOOR CONTROL MODULE H) SELF-TEST
- Using a diagnostic scan tool, perform the DCMH self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to: Power Sliding Door (PSD) .

No GO to BP6

BP6 RECHECK THE IPC (INSTRUMENT PANEL CLUSTER) DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, clear the IPC Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Wait 10 seconds.

Using a diagnostic scan tool, perform the continuous memory self-test.

Check the IPC Diagnostic Trouble Codes (DTCs).

Is DTC U020B:82 still present?

Yes

GO to BP7

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.

BP7 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

NOTE: If new modules were installed prior to the DTC being set, the module configuration may 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 DCMH, GWM or IPC. If recent service history is found:
- verify correct replacement module was installed
  - vehicle parts build may be used to verify correct part fitment
- verify the configuration of replacement module was correct
  - re-configure 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

Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?

Yes

GO to BP8

No	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

BP8 CHECK FOR CORRECT DCMH (DOOR CONTROL MODULE H) OPERATION

Ignition OFF.

Disconnect and inspect all DCMH connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect all the DCMH connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

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 service articles address this concern, INSTALL a new DCMH. REFER to: Power Sliding Door (PSD) Module .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.