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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1401 (Supplemental Restraint System) >> Diagnosis And Testing >> Air Bag And Safety Belt PRETENSIONER Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test B: DTC B1884 - PAD Warning Lamp Circuit Failure >> Pinpoint Test B: DTC B1884 - Pad Warning Lamp Circuit Failure

Pinpoint Test B: DTC B1884 - Pad Warning Lamp Circuit Failure

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.
NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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: 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: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
  1. B1 CHECK FOR CONTINUOUS OR 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  illuminate, go to  B2.
    2. If the PAD indicator does not  illuminate, go to  B4.
    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  B8.
  2. B2 CHECK CIRCUIT CR116 (GN/WH) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: PAD Indicator C2355
      • Fig 1: Checking Circuit CR116 (GN/WH) For Short To Ground
      GF0028564Courtesy of FORD MOTOR CO.
    • Measure the resistance between PAD indicator C2355-2, circuit CR116 (GN/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  B7.
    2. NO  : Go to  B3.
  3. B3 CHECK THE RCM FOR LOW RESISTANCE 
    • Disconnect: RCM C310a and C310b
      • Fig 2: Checking RCM For Low Resistance
      GF0008793Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C310a pin 22, component side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR circuit CR116 (GN/WH). Go to  B9.
    2. NO  : Go to  B7.
  4. B4 CHECK CIRCUIT CR116 (GN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C310a and C310b
    • Disconnect: PAD Indicator C2355
      • Fig 3: Checking Circuit CR116 (GN/WH) For Open
      GF0028565Courtesy of FORD MOTOR CO.
    • Measure the resistance between PAD indicator C2355-2, circuit CR116 (GN/WH), harness side and RCM C310a-22, circuit CR116 (GN/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B5.
    2. NO  : REPAIR circuit CR116 (GN/WH). Go to  B9.
  5. B5 CHECK CIRCUIT CBP24 (VT/GN) FOR VOLTAGE 
    • 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 4: Checking Circuit CBP24 (VT/GN) For Open
      GF0028566Courtesy of FORD MOTOR CO.
    • Measure the voltage between PAD indicator C2355-3, circuit CBP24 (VT/GN), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B6.
    2. NO  : VERIFY smart junction box (SJB) fuse 24 is OK. If OK, REPAIR circuit CBP24 (VT/GN). Go to  B9.
  6. B6 CHECK THE PAD INDICATOR LAMP 
    • Key in OFF position.
    • Deactivate the SRS. Refer to Supplemental Restraint System (SRS) Deactivation and Reactivation .
    • Connect: PAD Indicator C2355
    • Key in ON position.
      • Fig 5: Checking PAD Indicator Lamp
      GF0008796Courtesy of FORD MOTOR CO.
    • Connect a fused jumper wire between RCM C310a-22, circuit CR116 (GN/WH), harness side and ground.
    • Does the PAD indicator illuminate? 
    1. YES  : Go to  B7.
    2. NO  : INSTALL a new PAD indicator. REFER to Passenger Air Bag Deactivation (PAD) Indicator . Go to  B9.
  7. B7 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system component electrical connectors and the RCM electrical connectors 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  B9.
    2. NO  : In the process of diagnosing the fault, the fault condition has become intermittent. CHECK for causes of the intermittent fault in the areas previously worked in, particularly the pins and terminals of electrical connectors that were disconnected. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. 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  B9.
  8. B8 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  : This is a hard fault. The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. Go to  B2.
    2. NO  : The fault is not present and cannot be recreated at this time.

      CHECK for causes of intermittent open or short to ground on circuit CR116 (GN/WH). 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  B9.

  9. B9 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 - Restraints
    • Are any RCM and/or OCSM 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 and OCSM DTCs. PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.
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