Pinpoint Test N : U0208:00 Or U0509:82

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HUD U0208:00	Lost Communication With "Seat Control Module A": No Sub Type Information	Sets in continuous memory in the HUD module if data messages received from the DSM through the GWM are missing for 5 seconds or longer.
HUD U0509:82	Invalid Data Received From "Seat Control Module A": Alive/Sequence Counter Incorrect/Not Updated	Sets in continuous memory in the HUD module when the HUD module fails to receive memory data from the DSM through the GWM.

Possible Sources

Communication concern
GWM concern
DSM
HUD concern

N1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to N2

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.

N2 CHECK THE COMMUNICATION NETWORK
- Using a diagnostic scan tool, perform the network test.
Does the DSM pass the network test?

Yes GO to N3

No REFER to: Communications Network .

N3 PERFORM THE HUD (HEAD UP DISPLAY) MODULE SELF-TEST
- Using a diagnostic scan tool, perform the HUD module self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to DTC Chart: HUD Module in this information. Refer to Diagnostic Trouble Code (DTC) Chart

No GO to N4

N4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CM DTCs).
Are any Diagnostic Trouble Codes (DTCs) recorded?

Yes REFER to: Communications Network .

No GO to N5

N5 PERFORM THE DSM (DRIVER FRONT SEAT MODULE) SELF-TEST
- Using a diagnostic scan tool, perform the DSM self-test.
Are any non-network Diagnostic Trouble Codes (DTCs) present?

Yes REFER to: Front Seats .

No GO to N6

N6 RECHECK THE HUD (HEAD UP DISPLAY) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

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

Ignition OFF.

Ignition ON.

Wait 10 seconds.

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

Check the HUD module Diagnostic Trouble Codes (DTCs).

Is DTC U0208:00 or U0509:82 still present?

Yes

GO to N7

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.

N7 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 DSM, GWM or HUD module. 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 N8

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

N8 CHECK FOR CORRECT DSM (DRIVER FRONT SEAT MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the audio DSM 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 the DSM 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 DSM. REFER to: Driver Front Seat Module (DSM) .

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.