Possible Causes

Wiring, terminals or connectors
Network communication concern
IPC
SASM - Clockspring assembly

Fig 1: Gateway Module A (GWM) Connector - C2431

Courtesy of FORD MOTOR CO.

Harness Side

Fig 2: Instrument Panel Control Module (IPC) Connector - C220

Courtesy of FORD MOTOR CO.

Harness Side

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.

Does the IPC pass the Network Test?

Yes	No
RETRIEVE and RECORD all IPC DTCs. REFER to the Instrumentation, Message Center and Warning Chimes article. If there are no DTCs in the IPC, Go to BB3.	Go to BB2.

BB2: CHECK THE COMMUNICATION TO THE GWM

Review the results of the modules communicating on the network from the previous step.

Did the GWM pass the network test?

Yes	No
DIAGNOSE the IPC does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article.	DIAGNOSE the GWM does not communicate with the diagnostic scan tool. REFER to the Module Communications Network article.

BB3: RECHECK THE SASM DTCS

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 BB4.	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

BB4: 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 U3003:1C, GO to PINPOINT TEST BD . For DTC U3003:17, GO to PINPOINT TEST BE . For all others, No fault found.	Go to BB5.

BB5: CHECK FOR GWM DTCS

Carry out the GWM self-test.

Are any DTCs present?

Yes	No
DIAGNOSE the GWM DTCs. REFER to the Multifunction Electronic Modules article.	Go to BB6.

BB6: CHECK FOR IPC DTCS

Carry out the IPC self-test.

Are any DTCs present?

Yes	No
DIAGNOSE the IPC DTCs. REFER to the Instrumentation, Message Center and Warning Chimes article.	Go to BB7.

BB7: 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 BB8.	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

BB8: 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 BB9.	Go to BB10.

BB9: VERIFY IPC OPERATION

Ignition OFF.
IPC connector disconnected. (C220)
GWM connector disconnected. (C2431)
SASM connector disconnected.
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
SASM connector connected. Make sure the connector seats and latches correctly.
GWM connector connected. (C2431) Make sure the connector seats and latches correctly.
IPC connector connected. (C220) 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 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 services articles address this concern, INSTALL a new IPC. REFER to the Instrumentation, Message Center and Warning Chimes article.	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.

BB10: VERIFY SASM OPERATION

Ignition OFF.
SASM connector disconnected.
GWM connector disconnected. (C2431)
IPC connector disconnected. (C220)
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
IPC connector connected. (C220) 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 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 services articles address this concern, INSTALL a new SASM-clockspring assembly. REFER to the Supplemental Restraints System article.	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.