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Home >> Lincoln >> 2018 >> Navigator Select, 4WD >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> RCM Guided Routine Testing -- (3 Of 4) >> Pinpoint Tests >> Pinpoint Test BG: Lost Communication with BECMB >> Possible Causes
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Possible Causes

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Only disconnect or reconnect SRS components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford parts catalog to make sure the correct component is being installed. If an incorrect SRS component is installed, DTCs may set.
  1. BG1: VERIFY THE CONCERN 
    WARNING: Before beginning any service procedure in this article, refer to Safety Warnings in General Information article. Failure to follow this instruction may result in serious personal injury. Refer to Pyrotechnic Device Health and Safety Precautions.
    • Ignition ON, engine OFF.
    • Using a diagnostic scan tool, carry out a network test.
    • Does the BECMB pass the network test? 
    Yes No
    Go to  BG2. To diagnose no communication with the BECMB, REFER to the appropriate procedure in Module Communications Network article
  2. BG2: CHECK THE RCM CMDTCS 
    • Carry out the RCM self-test.
    • Clear the RCM DTCs.
    • Wait 10 seconds.
    • Carry out the RCM self-test.
    • Is DTC U0112:00 retrieved again? 
    Yes No
    Go to  BG3. 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. BG3: RETRIEVE THE RECORDED DTCS FROM THE RCM SELF-TEST 
    • Carry out the RCM self-test.
    • Check the recorded DTCs from the RCM self-test.
    • Is DTC U3003:16 or U3003:17 recorded? 
    Yes No
    REFER to the DTC Chart. 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 BECMB.
    REFER to the appropriate Removal and Installation procedure.
    REPEAT the RCM self-test. If DTC U0112:00 returns, INSTALL a new RCM. REFER to the appropriate Removal and Installation procedure.
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