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Pinpoint Test - DTC: AA BXXXX:2B (any BXXXX DTC with a 2B failure type) Signal Cross Coupled

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Supplemental Restraint System . For schematic and connector Information.

Normal Operation and Fault Conditions 

The RCM monitors all deployable device and sensor circuits. For a signal cross coupled (short) between components. Signal cross coupled Diagnostic Trouble Codes (DTCs) are present when one or both circuits of a component are shorted to one or both circuits of another component. Signal cross coupled Diagnostic Trouble Codes (DTCs) do not set when the circuits of a single device are shorted together, a different DTC is present (. For example, a DTC. For circuit resistance below threshold). The RCM sends a message to the IPC to illuminate the airbag warning indicator. When a normal loop fault is present (one loop is either shorted to battery/ground, open circuit or low resistance), then signal cross coupled diagnostics are not active. Once the normal loop fault is repaired, the signal cross coupled diagnostics resume.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
B0001:2B Driver Frontal Stage 1 Deployment Control: Signal Cross Coupled If the RCM detects a short between the driver airbag stage 1 circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0002:2B Driver Frontal Stage 2 Deployment Control: Signal Cross Coupled If the RCM detects a short between the driver airbag stage 2 circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0004:2B Driver Knee Bolster Deployment Control: Signal Cross Coupled If the RCM detects a short between the driver lower airbag circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0010:2B Passenger Frontal Stage 1 Deployment Control: Signal Cross Coupled If the RCM detects a short between the passenger airbag stage 1 circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0011:2B Passenger Frontal Stage 2 Deployment Control: Signal Cross Coupled If the RCM detects a short between the passenger airbag stage 2 circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0050:2B Driver Seatbelt Sensor: Signal Cross Coupled If the RCM detects a short between the driver safety belt buckle switch circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0052:2B Passenger Seatbelt Sensor: Signal Cross Coupled If the RCM detects a short between the passenger safety belt buckle switch circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0070:2B Driver Seatbelt Pretensioner "A" Deployment Control: Signal Cross Coupled If the RCM detects a short between the driver safety belt anchor pretensioner circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0072:2B Passenger Seatbelt Pretensioner "A" Deployment Control: Signal Cross Coupled If the RCM detects a short between the passenger safety belt anchor pretensioner circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B007E:2B Driver Seatbelt Pretensioner "C" Deployment Control: Signal Cross Coupled If the RCM detects a short between the driver safety belt retractor pretensioner circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B007F:2B Passenger Seatbelt Pretensioner "C" Deployment Control: Signal Cross Coupled If the RCM detects a short between the passenger safety belt retractor pretensioner circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B0082:2B Passenger Seatbelt Load Limiter Deployment Control: Signal Cross Coupled If the RCM detects a short between the passenger safety belt load limiter circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B00B5:2B Driver Seat Track Position Restraints Sensor: Signal Cross Coupled If the RCM detects a short between the LH seat track position sensor circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B00C5:2B Passenger Seat Track Position Restraints Sensor: Signal Cross Coupled If the RCM detects a short between the RH seat track position sensor circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B11CF:2B Passenger Frontal Airbag Canister Vent: Signal Cross Coupled If the RCM detects a short between the passenger airbag canister vent circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1404:2B Driver Side Airbag Deployment Control: Signal Cross Coupled If the RCM detects a short between the driver side airbag circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1405:2B Driver Curtain Deployment Control 1: Signal Cross Coupled If the RCM detects a short between the LH side air curtain circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1407:2B Passenger Side Airbag Deployment Control: Signal Cross Coupled If the RCM detects a short between the passenger side airbag circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1408:2B Passenger Curtain Deployment Control 1: Signal Cross Coupled If the RCM detects a short between the RH side air curtain circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1413:2B Driver Frontal Restraints Sensor: Signal Cross Coupled If the RCM detects a short between the LH frontal restraints sensor circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1414:2B Driver Side Restraints Sensor 1: Signal Cross Coupled If the RCM detects a short between the RH C-pillar or driver front door restraints sensor circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1417:2B Right Frontal Restraints Sensor: Signal Cross Coupled If the RCM detects a short between the RH frontal restraints sensor circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.
B1418:2B Passenger Side Restraints Sensor 1: Signal Cross Coupled If the RCM detects a short between the LH second row or passenger front door restraints sensor circuits and the circuits of another SRS component, it sets this DTC and the DTC of the corresponding SRS component.

Possible Sources 

Visual Inspection and Diagnostic Pre-Checks 

PINPOINT TEST A : BXXXX:2B (ANY BXXXX DTC (DIAGNOSTIC TROUBLE CODE) WITH A 2B FAILURE TYPE) SIGNAL CROSS COUPLED 

  1. WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
  3. NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification be. Fore proceeding with the pinpoint test.
  4. 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.
  5. 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, Diagnostic Trouble Codes (DTCs) may set.
  6. NOTE: The SRS must be fully operational and free of faults be. Fore releasing the vehicle to the customer.

  7. A1 RETRIEVE RCM (RESTRAINTS CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    • WARNING: Be. Fore beginning any service procedure in this article, refer to Health and Safety Precautions . Failure to follow this instruction may result in serious personal injury.

    • Ignition ON.

    • Using a diagnostic scan tool, per. Form RCM self-test.

    Were any signal cross coupled Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test? 

    Yes  This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. GO to  A2
    No  This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only. GO to  A4

  8. A2 CHECK THE AFFECTED CIRCUITS. For A SIGNAL CROSS COUPLED FAULT

    • Ignition OFF.

    • Using the signal cross coupled Diagnostic Trouble Codes (DTCs) present on-demand, identify the affected SRS devices.

    • NOTE: Most signal cross coupled faults are due to connector and/or wiring harness damage. Carry out a thorough inspection of connector(s) and/or wiring harness. For damage.

      Disconnect all of the affected SRS devices.

    • Using the following table, measure the resistance between the circuits of one affected SRS device to the other affected SRS device.

      • Example: If Diagnostic Trouble Codes (DTCs) B0001:2B and B0002:2B are being diagnosed, measure the resistance between circuit CR101 to circuits CR102 and RR102. Then measure the resistance between circuit RR101 to circuits CR102 and RR102.

      Device/Loop (DTC) Connector Circuit
      Driver airbag stage 1 (B0001:2B) C216A-1
      C216A-2      		 CR101 (YE/GN)
      RR101 (VT/BN)
      Driver airbag stage 2 (B0002:2B) C216B-1
      C216B-2      		 CR102 (WH)
      RR102 (BU)
      Driver knee airbag (B0004:2B) C2432-1
      C2432-2      		 CR139 (VT/WH)
      RR139 (YE)
      Passenger airbag stage 1 (B0010:2B) C256A-1
      C256A-2      		 CR103 (GY/BU)
      RR103 (VT/GN)
      Passenger airbag stage 2 (B0011:2B) C256B-1
      C256B-2      		 CR104 (YE/GY)
      RR104 (WH/BU)
      Driver safety belt buckle switch (B0050:2B) C3201-5 CR201 (GN/BU)
      Passenger safety belt buckle switch (B0052:2B) C3738-5 CR201 (GN/BU)
      Driver safety belt anchor pretensioner (B0070:2B) C3065-1
      C3065-2      		 CR170 (GN)
      RR170 (BN/BU)
      Passenger safety belt anchor pretensioner (B0072:2B) C3066-1
      C3066-2      		 CR171 (VT/GN)
      RR171 (GY)
      Driver safety belt retractor pretensioner (B007E:2B) C323-1
      C323-2      		 CR120 (BU/OG)
      RR120 (BN/GN)
      Passenger safety belt retractor pretensioner (B007F:2B) C303-1
      C303-2      		 CR122 (WH/OG)
      RR122 (BN)
      Passenger safety belt adaptive load limiter (B0082:2B) C3202-1
      C3202-2      		 CR147 (GN/OG)
      RR147 (YE/VT)
      Driver seat position sensor (B00B5:2B) C356-2 VR215 (YE/VT)
      Passenger seat track position sensor (B00C5:2B) C3240-2 VR215 (YE/VT)
      Passenger airbag canister vent (B11CF:2B) C256C-1
      C256C-2      		 CR144 (GY/OG)
      RR144 (VT/GN)
      Driver side airbag (B1404:2B) C3368-1 (Inline)
      C3368-2 (Inline)      		 CR106 (VT/GY)
      RR106 (YE/OG)
      LH side air curtain (B1405:2B) C3321-1
      C3321-2      		 CR109 (BN/BU)
      RR109 (BU/GN)
      Passenger side airbag (B1407:2B) C3206-1 (Inline)
      C3206-2 (Inline)      		 CR106 (VT/GY)
      RR106 (YE/OG)
      RH side air curtain (B1408:2B) C3329-1
      C3329-2      		 CR111 (BN/WH)
      RR111 (YE/VT)
      LH frontal restraints sensor (B1413:2B) C1465-1
      C1465-2      		 VR213 (VT/GN)
      RR129 (YE/GY)
      RH C-pillar or driver front door restraints sensor (B1414:2B) C3249-1
      C3249-2
      C567-1
      C567-2      		 VR220 (VT/OG)
      RR134 (BN/BU)
      VR221 (BU/GN)
      RR135 (GN/BN)
      RH frontal restraints sensor (B1417:2B) C1466-1
      C1466-2      		 VR214 (WH/BU)
      RR130 (GN/BU)
      LH C-pillar or passenger front door restraints sensor (B1418:2B) C3248-1
      C3248-2
      C644-1
      C644-2      		 VR219 (GN/WH)
      RR133 (GY/BN)
      VR222 (GY/OG)
      RR136 (BN/WH)

    Are the resistances greater than 10, 000 ohms between the affected circuits? 

    Yes  GO to  A3
    No  REPAIR the affected circuits. REFER to Connector Repair Procedures . For schematic and connector Information. GO to  A5

  9. A3 CONFIRM THE RCM (RESTRAINTS CONTROL MODULE) FAULT

    NOTE: Make sure all SRS components and the RCM electrical connectors are connected be. Fore carrying out the self-test. If not, Diagnostic Trouble Codes (DTCs) will be recorded.

    • Prior to reconnecting any previously disconnected SRS component:

      • inspect connector(s) (including any inline connectors). For pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
      • inspect wire harness. For any damage, pinched, cut or pierced wires.
      • inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock. For correct operation.
      • repair any concerns found. REFER to Connector Repair Procedures . For schematic and connector Information.

    • Connect all previously disconnected restraint system component(s).

    • Ignition ON.

    • Using a diagnostic scan tool, per. Form RCM self-test.

    Were any signal cross coupled Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test? 

    Yes  CHECK OASIS. For any applicable Technical Service Bulletins (TSBs). If a TSB exists. For this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new RCM. REFER to: Restraints Control Module (RCM) . GO to  A5
    No  In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to  A4

  10. A4 CHECK. For AN INTERMITTENT FAULT

    NOTE: Most cross link faults are due to connector and/or wiring harness damage. Carry out a thorough inspection of connector(s) and/or wiring harness. For damage.

    • Ignition OFF.

    • Inspect the wiring harness(es). For any type of damage. If damage is found, repair as necessary and Refer to Connector Repair Procedures . For schematic and connector Information.

    • Ignition ON.

    • Using a diagnostic scan tool, per. Form RCM self-test.

    Were any signal cross coupled Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test? 

    Yes  This fault cannot be cleared until it is corrected and the DTC is no longer retrieved on-demand during self-test. GO to  A2
    No  The fault is not present and cannot be recreated at this time. CHECK. For causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. Do not install any new SRS components at this time. Install SRS components only when directed to do so in the pinpoint test. GO to  A5

  11. A5 CHECK. For ADDITIONAL SRS (SUPPLEMENTAL RESTRAINT SYSTEM) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Ignition OFF.

    • Reconnect all SRS components (if previously disconnected).

    • Ignition ON.

    • NOTE: When selecting Restraints from the Self Test menu, DTCs are retrieved from the RCM, OCSM and, if equipped, BECMB.

      Using a diagnostic scan tool, per. Form

      Restraints  self-test.

    Are any RCMOCSM and/or BECMB Diagnostic Trouble Codes (DTCs) retrieved on-demand during self-test? 

    Yes  Do not clear any Diagnostic Trouble Codes (DTCs) until all Diagnostic Trouble Codes (DTCs) have been resolved. REFER to: Airbag Supplemental Restraint System (SRS) .
    No  The repair is complete. RETURN the vehicle to the customer.
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