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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1795 (Supplemental Restraint System) >> Diagnosis And Testing >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Supplemental Restraint System (SRS) >> Pinpoint Test H: DTCs B0021:11, B0021:12, B0021:13 and B0021:1A >> PINPOINT TEST H: DTCs B0021:11, B0021:12, B0021:13 AND B0021:1A

PINPOINT TEST H: DTCs B0021:11, B0021:12, B0021:13 AND B0021:1A

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Never probe the electrical connectors on air bag, Safety Canopy® or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: Supplemental Restraint System (SRS) components should only be disconnected or reconnected 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 Catalog Advantage™ to make sure the correct component is being installed. If an incorrect SRS component is installed, DTCs may set.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. H1 RETRIEVE RCM DTCs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • Was DTC B0021:11, B0021:12, B0021:13 or B0021:1A 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.

      For DTC B0021:13 or B0021:1A, GO to H2  .

      For DTC B0021:11, GO to  H8.

      For DTC B0021:12, GO to  H10.

    • No  : This is an intermittent fault when present as a Continuous Memory Diagnostic Trouble Code (CMDTC) only.

      For DTC B0021:13 or B0021:1A, GO to  H13.

      For DTC B0021:11, GO to  H14.

      For DTC B0021:12, GO to  H15.

  2. H2 CHECK THE LEFT CURTAIN DEPLOYMENT CONTROL 1 RESISTANCE (DEPLOY_11_R) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - RCM.
      • DEPLOY_11_R PID
    • Does the PID value read between 1.7 and 2.78 ohms? 
    • Yes  : GO to  H12.
    • No  : GO to H3  .
  3. H3 CHECK THE LEFT CURTAIN DEPLOYMENT CONTROL 1 RESISTANCE (DEPLOY_11_R) PID WHILE CARRYING OUT THE HARNESS TEST 
    • While monitoring the DEPLOY_11_R PID, carry out the harness test of the driver side air curtain circuits and accessible connectors (including any in-line connectors) by wiggling connectors and flexing the wire harness frequently.
    • Does the PID value read between 1.7 and 2.78 ohms while carrying out the harness test? 
    • Yes  : DEPOWER the SRS and REPAIR the connector, terminals or wire harness as needed. Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
    • No  : For PID value less than 1.7 ohms, GO to H4  .

      For PID value greater than 2.78 ohms, GO to  H6.

  4. H4 CHECK THE LEFT CURTAIN DEPLOYMENT CONTROL 1 DTC FOR A FAULT STATUS CHANGE (LOW RESISTANCE INDICATED) 
    NOTE: This pinpoint test step will attempt to change the fault reported by the RCM by inducing a different fault condition. If the fault reported changes, this indicates the RCM is functioning correctly and is not the source of the fault.
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect the driver side air curtain C3055.
      • Remove the LH C-pillar trim cover retainer cap.
      • Remove the retainer and LH C-pillar trim cover.
    • Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • DIAGNOSTIC TIP:  When viewing DTCs with the driver side air curtain disconnected, an open circuit fault would normally be retrieved.
    • Did the on-demand DTC change from B0021:1A to B0021:13? 
    • Yes  : GO to  H11.
    • No  : GO to H5  .
  5. H5 CHECK FOR A SHORT BETWEEN DRIVER SIDE AIR CURTAIN CIRCUITS 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect: RCM C310A and C310B.
    • Measure the resistance between driver side air curtain C3055-1, circuit CR109 (BN/BU), harness side and C3055-3, circuit RR109 (BU/GN), harness side.
      Fig 1: Measuring Resistance Between Driver Side Air Curtain C3055-1, Circuit CR109 (BN/BU) And C3055-3, Circuit RR109 (BU/GN), Harness Side
      G07783836Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to  H12.
    • No  : REPAIR circuits CR109 (BN/BU) and RR109 (BU/GN). Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
  6. H6 CHECK THE DRIVER SIDE AIR CURTAIN CIRCUITS FOR AN OPEN 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect the driver side air curtain C3055.
      • Remove the LH C-pillar trim cover retainer cap.
      • Remove the retainer and LH C-pillar trim cover.
    • Disconnect: RCM C310A and C310B.
    • Measure the resistance between RCM C310B, harness side and driver side air curtain C3055, harness side using the following chart.
      RCM REFERENCE CHART

      RCM Connector Circuit Driver Side Air Curtain Electrical Connector
      C310B-7 CR109 (BN/BU) C3055-1
      C310B-8 RR109 (BU/GN) C3055-3
      Fig 2: Measuring Resistance Between RCM C310B And Driver Side Air Curtain C3055, Harness Side
      G07783837Courtesy of FORD MOTOR CO.
    • Are the resistances less than 0.5 ohm? 
    • Yes  : GO to H7  .
    • No  : REPAIR circuit CR109 (BN/BU) or RR109 (BU/GN). Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information.. GO to  H17.
  7. H7 CHECK THE LEFT CURTAIN DEPLOYMENT CONTROL 1 DTC FOR A FAULT STATUS CHANGE (OPEN INDICATED) 
    NOTE: This pinpoint test step will attempt to change the fault reported by the RCM by inducing a different fault condition. If the fault reported changes, this indicates the RCM is functioning correctly and is not the source of the fault.
    • Connect: RCM C310A and C310B.
    • Connect a fused jumper wire between the driver side air curtain C3055-1, circuit CR109 (BN/BU), harness side and C3055-3, circuit RR109 (BU/GN), harness side.
    • Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • DIAGNOSTIC TIP:  When viewing DTCs with the driver side air curtain circuits shorted together, a low resistance fault would normally be retrieved.
    • Did the on-demand DTC change from B0021:13 to B0021:1A? 
    • Yes  : GO to  H11.
    • No  : GO to  H12.
  8. H8 CHECK THE LEFT CURTAIN DEPLOYMENT CONTROL 1 DTC FOR A FAULT STATUS CHANGE (SHORT TO GROUND INDICATED) 
    NOTE: This pinpoint test step will attempt to change the fault reported by the RCM by inducing a different fault condition. If the fault reported changes, this indicates the RCM is functioning correctly and is not the source of the fault.
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect the driver side air curtain C3055.
      • Remove the LH C-pillar trim cover retainer cap.
      • Remove the retainer and LH C-pillar trim cover.
    • Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • DIAGNOSTIC TIP:  When viewing DTCs with the driver side air curtain disconnected, an open circuit fault would normally be retrieved.
    • Did the on-demand DTC change from B0021:11 to B0021:13? 
    • Yes  : GO to  H11.
    • No  : GO to H9  .
  9. H9 CHECK THE DRIVER SIDE AIR CURTAIN CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect: RCM C310A and C310B.
    • Measure the resistance between driver side air curtain:
      • C3055-1, circuit CR109 (BN/BU), harness side and ground.
      • C3055-3, circuit RR109 (BU/GN), harness side and ground.
        Fig 3: Checking Driver Side Air Curtain Circuits For Short To Ground
        G07783838Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  H12.
    • No  : REPAIR circuit CR109 (BN/BU) or RR109 (BU/GN). Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
  10. H10 CHECK THE DRIVER SIDE AIR CURTAIN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect the driver side air curtain C3055.
      • Remove the LH C-pillar trim cover retainer cap.
      • Remove the retainer and LH C-pillar trim cover.
    • Disconnect: RCM C310A and C310B.
    • Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Measure the voltage between driver side air curtain:
      • C3055-1, circuit CR109 (BN/BU), harness side and ground.
      • C3055-2, circuit RR109 (BU/GN), harness side and ground.
        Fig 4: Checking Driver Side Air Curtain Circuits For Short To Voltage
        G07783839Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 
    • Yes  : REPAIR circuit CR109 (BN/BU) or RR109 (BU/GN). Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
    • No  : GO to  H12.
  11. H11 CONFIRM THE DRIVER SIDE AIR CURTAIN MODULE FAULT 
    NOTE: Make sure all restraint system components and the RCM electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
    • Yes  : INSTALL a new driver side air curtain. REFER to SIDE AIR CURTAIN MODULE  in this service information. GO to  H17.
    • No  : In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  .

      For DTC B0021:13 or B0021:1A, GO to  H13.

      For DTC B0021:11, GO to  H14.

      For DTC B0021:12, GO to  H15.

  12. H12 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system components and the RCM electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • If previously installed, remove the fused jumper wire from the driver side air curtain electrical connector.
    • Prior to reconnecting any previously disconnected SRS component:
      • inspect connector(s) (including any in-line 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. Refer to RESTRAINTS CONTROL MODULE (RCM)  in this service information.
      • repair any concerns found. Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information.
    • Connect: Driver Side Air Curtain C3055 (if previously disconnected).
    • Connect: RCM C310A and C310B (if previously disconnected).
    • Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • Was the original DTC retrieved on-demand during self-test? 
    • Yes  : INSTALL a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM)  in this service information. GO to  H17.
    • No  : In the process of diagnosing the fault, the fault condition has become intermittent. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  .

      For DTC B0021:13 or B0021:1A, GO to H13.

      For DTC B0021:11, GO to  H14.

      For DTC B0021:12, GO to  H15.

  13. H13 CHECK THE LEFT CURTAIN DEPLOYMENT CONTROL 1 RESISTANCE (DEPLOY_11_R) PID FOR AN INTERMITTENT LOW RESISTANCE OR OPEN CIRCUIT FAULT 
    • Enter the following diagnostic mode on the scan tool: DataLogger - RCM.
      • DEPLOY_11_R PID
    • Attempt to recreate the fault by wiggling connectors (including any inline connectors) and flexing the wire harness frequently.
    • Does the PID value read between 1.7 and 2.78 ohms? 
    • Yes  : The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to  H16.
    • No  : DEPOWER the SRS and REPAIR as necessary. Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
  14. H14 CHECK FOR AN INTERMITTENT LEFT CURTAIN DEPLOYMENT CONTROL 1 SHORT TO GROUND FAULT 
    • Attempt to recreate the fault by wiggling connectors (including any inline connectors) and flexing the wire harness frequently.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • Was DTC B0021:11 retrieved on-demand during self-test? 
    • Yes  : DEPOWER the SRS and REPAIR as necessary. Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
    • No  : The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to  H16.
  15. H15 CHECK FOR AN INTERMITTENT LEFT CURTAIN DEPLOYMENT CONTROL 1 SHORT TO BATTERY FAULT 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect the driver side air curtain C3055.
      • Remove the LH C-pillar trim cover retainer cap.
      • Remove the retainer and LH C-pillar trim cover.
    • Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Attempt to recreate the fault by wiggling connectors (including any inline connectors) and flexing the wire harness frequently.
    • Enter the following diagnostic mode on the scan tool: Self Test - RCM.
    • Was DTC B0021:12 retrieved on-demand during self-test? 
    • Yes  : DEPOWER the SRS and REPAIR as necessary. Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to  H17.
    • No  : The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to H16  .
  16. H16 CHECK THE HARNESS AND CONNECTORS 
    • Ignition OFF.
    • Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Disconnect the driver side air curtain:
      • remove the LH C-pillar trim cover retainer cap.
      • remove the retainer and LH C-pillar trim cover.
      • inspect connector(s) (including any in-line connectors) for corrosion, 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 CPA lever/lock for correct operation. Refer to RESTRAINTS CONTROL MODULE (RCM)  in this service information.
    • Were any concerns found? 
    • Yes  : REPAIR as necessary. Refer to SYSTEM WIRING DIAGRAMS article for schematic and connector information. GO to H17  .
    • No  : The fault is not present and cannot be recreated at this time. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test  . GO to H17  .
  17. H17 CHECK FOR ADDITIONAL SRS DTCs 
    • Ignition OFF.
      WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
    • Reconnect all SRS components (if previously disconnected).
    • If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING  in this service information.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - Restraints.
      NOTE: When selecting Restraints from the Self Test menu, DTCs will be retrieved from the RCM and OCSM.
    • Are any RCM and/or OCSM DTCs retrieved on-demand during self-test? 
    • Yes  : Do not clear any DTCs until all DTCs have been resolved. GO to the DTC TABLES  in this service information for pinpoint test direction.
    • No  : CLEAR all RCM and OCSM CMDTCs. PROVE OUT the SRS. Repair is complete. RETURN the vehicle to the customer.
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