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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Supplemental Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test D: LFC 18/DTC B1884 - PAD Warning Lamp Circuit Failure >> Pinpoint Test D: LFC18/DTC B1884 - Pad Warning Lamp Circuit Failure

Pinpoint Test D: LFC18/DTC B1884 - Pad Warning Lamp Circuit Failure

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
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.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: 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: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
  1. D1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
    • Was RCM on-demand DTC B1884 retrieved? 
    1. YES  : If the PAD indicator does not  illuminate, go to  D2.
    2. If the PAD indicator does  illuminate, go to  D5.
    3. NO  : This is an intermittent fault when present as a continuous memory DTC only (DTC not retrieved on demand). The fault condition is not present at this time. Go to  D9.
  2. D2 CHECK THE RCM CONNECTOR 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C2041a and C2041b
      • Fig 1: Inspecting RCM C2041A Component Side For Damaged Camming Beams
      GF0002135Courtesy of FORD MOTOR CO.
    • Inspect the RCM C2041a component side for damaged camming beams.
      • Fig 2: Inspecting RCM C2041A Harness Side For Worn, Damaged Or Dislodged Shorting Bars
      GF0002136Courtesy of FORD MOTOR CO.
      NOTE: The shorting bars can be accessed by prying out the cover from the harness side of the connector. Do not remove or defeat the shorting bars.
    • Inspect RCM C2041a harness side for worn, damaged or dislodged shorting bars. Inspect for foreign material. Inspect for pushed out connector terminals.
    • Were any RCM connector concerns found? 
    1. YES  : CORRECT the connector concerns. Go to  D10.
    2. NO  : Go to  D3.
  3. D3 CHECK CIRCUIT 1632 (TN/LB) FOR SHORT TO GROUND 
    • Connect: RCM C2041a and C2041b
    • Disconnect: PAD Indicator C2039
      • Fig 3: Checking Circuit 1632 (TN/LB) For Short To Ground
      GF0014914Courtesy of FORD MOTOR CO.
    • Measure the resistance between PAD indicator C2039-2, circuit 1632 (TN/LB), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D8.
    2. NO  : Go to  D4.
  4. D4 CHECK THE RCM 
    • Disconnect: RCM C2041a and C2041b
      • Fig 4: Measuring Resistance Between RCM C2041A-15, Circuit 1632 (TN/LB), Component Side & Ground
      GF0002138Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C2041a-15, circuit 1632 (TN/LB), component side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR circuit 1632 (TN/LB). Go to  D10.
    2. NO  : Go to  D8.
  5. D5 CHECK THE PAD INDICATOR 
    1. YES  : Go to  D8.
    2. NO  : Go to  D6.
  6. D6 CHECK CIRCUIT 1632 (TN/LB) FOR AN OPEN 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: PAD Indicator C2039
      • Fig 5: Checking Circuit 1632 (TN/LB) For Open
      GF0014915Courtesy of FORD MOTOR CO.
    • Measure the resistance between PAD indicator C2039-2, circuit 1632 (TN/LB), harness side and RCM C2041a-15, circuit 1632 (TN/LB), harness side.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  D7.
    2. NO  : REPAIR circuit 1632 (TN/LB). Go to  D10.
  7. D7 CHECK CIRCUIT 1850 (YE) FOR AN OPEN 
    • Repower the SRS. Do not  prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Key in ON position.
      • Fig 6: Checking Circuit 1850 (YE) For Open
      GF0014916Courtesy of FORD MOTOR CO.
    • Measure the voltage between PAD indicator C2039-3, circuit 1850 (YE), harness side and ground.
    • Is voltage greater than 10 volts? 
    1. YES  : INSTALL a new PAD indicator. REFER to Passenger Air Bag Deactivation (PAD) Indicator . Go to  D10.
    2. NO  : REPAIR circuit 1850 (YE). Go to  D10.
  8. D8 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connector are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded.
    1. YES  : INSTALL a new RCM. REFER to Restraints Control Module (RCM) . Go to  D10.
    2. NO  : CHECK for causes of intermittent open or short to ground on circuit 1632 (TN/LB). ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. 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.  REPAIR any intermittent wiring, terminal or connector concerns found. Go to  D10.
  9. D9 CHECK FOR AN INTERMITTENT FAULT 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
    • Was RCM on-demand DTC B1884 retrieved? 
    1. YES  : Go to  D2.
    2. NO  : CHECK for causes of intermittent open or short to ground on circuit 1632 (TN/LB). ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. 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.  REPAIR any intermittent wiring, terminal or connector concerns found. Go to  D10.
  10. D10 CHECK FOR ADDITIONAL SRS DTCs 
    • Key in OFF position.
      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).
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test - RCM
    • Are any RCM DTCs retrieved indicating a fault? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to the Supplemental Restraint System (SRS) DTC Chart  for pinpoint test direction.
    2. NO  : CLEAR all RCM continuous memory DTCs. PROVE OUT the SRS. Repair is complete. RETURN the vehicle to the customer.
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