Possible Causes

• Wiring, terminals or connectors
• Network communication concern
• IPC
  Fig 1: Gateway Module A (GWM) Connector - C2431

  Courtesy of FORD MOTOR CO.

Harness Side

1. BB1: CHECK THE COMMUNICATION NETWORK 
   • Ignition ON, engine OFF.
   • Press the Read Vehicle Information button to view the results of the modules communicating on the network.
   • Retrieve the continuous memory DTCs.
   • Do the IPC and the GWM pass the Network Test? 

     Yes	No
     Go to  BB2.	DIAGNOSE the scan tool does not communicate with the IPC or the GWM. REFER to MODULE COMMUNICATIONS NETWORK (EXCEPT HYBRID) .

2. BB2: REPEAT THE SASM SELF-TEST AND CHECK IF THE DTC SETS AGAIN 
   • Clear the SASM DTCs.
   • Ignition OFF.
   • Ignition ON, engine OFF.
   • Carry out the SASM self-test.
   • Is DTC U0155:xx still present? 

     Yes	No
     Go to  BB3.	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

3. BB3: REVIEW THE SASM SELF-TEST FOR VOLTAGE-REALTED DTCS 
   • Review the results from the SASM self-test.
   • Is DTC U3003:1C or U3003:17 present? 

     Yes	No
     For DTC U3003:1 C, Go to PINPOINT TEST BD . For DTC U3003:17, Go to PINPOINT TEST BE . For all others, No fault found.	Go to  BB4.

4. BB4: CHECK FOR GWM DTCS 
   • Carry out the GWM self-test.
   • Are any DTCs present? 

     Yes	No
     DIAGNOSE the GWM DTCs. REFER to MULTIFUNCTION ELECTRONIC MODULES (EXCEPT HYBRID) .	Go to  BB5.

5. BB5: CHECK FOR IPC DTCS 
   • Carry out the IPC self-test.
   • Are any DTCs present? 

     Yes	No
     DIAGNOSE the IPC DTCs. REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES (EXCEPT HYBRID) .	Go to  BB6.

6. BB6: CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN 
   NOTE: 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 IPC or SASM. 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.
   • Operate the system and determine if the observable symptom is still present.
   • Is the concern still present? 

     Yes	No
     Go to  BB7.	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

7. BB7: CHECK FOR COMMUNICATION DTCS IN OTHER MODULES 
   • Ignition ON, engine OFF.
   • Retrieve the continuous memory DTCs.
   • Is DTC U0155:xx set in 1 or more modules in addition to the SASM? 

     Yes	No
     Go to  BB8.	Go to  BB9.

8. BB8: VERIFY IPC OPERATION 
   • Ignition OFF.
   • IC connector disconnected.
   • GWM connector disconnected. (C2431)
   • SASM connector disconnected.
   • Disconnect all in-line electrical connectors between the SASM, the GWM and the IPC.
   • Using a good light source, inspect all disconnected electrical connectors for the following:
     • corrosion - install new connector or terminal and clean the module pins
     • damaged or bent pins - install new terminals or pins
     • pushed-out pins - install new pins as necessary
     • spread terminals - install new terminals as necessary
   • Connect all in-line electrical connectors between the SASM, the GWM and the IPC. Make sure the connectors seat and latch correctly.
   • SASM connector connected. Make sure the connector seats and latches correctly.
   • GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
   • IC connector connected. Make sure the connector seats and latches correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 

     Yes	No
     INSTALL a new IC. CHECK OASIS for any applicable Technical Service Bulletins TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new IPC. REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES (EXCEPT HYBRID) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

9. BB9: VERIFY SASM OPERATION 
   • Ignition OFF.
   • SASM connector disconnected.
   • GWM connector disconnected. (C2431)
   • IC connector disconnected.
   • Disconnect all in-line electrical connectors between the SASM, the GWM and the IPC.
   • Using a good light source, inspect all disconnected electrical connectors for the following:
     • corrosion - install new connector or terminal and clean the module pins
     • damaged or bent pins - install new terminals or pins
     • pushed-out pins - install new pins as necessary
     • spread terminals - install new terminals as necessary
   • Connect all in-line electrical connectors between the SASM, the GWM and the IPC. Make sure the connectors seat and latch correctly.
   • IC connector connected. Make sure the connector seats and latches correctly.
   • GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
   • SASM connector connected. Make sure the connector seats and latches correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 

     Yes	No
     INSTALL a new SASM. CHECK OASIS for any applicable Technical Service Bulletins TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new SASM-clockspring assembly. REFER to SUPPLEMENTAL RESTRAINT SYSTEM (EXCEPT HYBRID) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.