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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1114 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test Q: DTC B2437 - Passenger's Seat Belt Buckle Switch Circuit Short to Battery >> Pinpoint Test Q: DTC B2437 - Passenger's Seat Belt Buckle Switch Circuit Short To Battery

Pinpoint Test Q: DTC B2437 - Passenger's Seat Belt Buckle Switch Circuit Short To Battery

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the safety canopy and cause serious personal injury or death.
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.
WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
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. Q1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs 
    NOTE: If the RCM reports an on-demand DTC U0154 (Lost Communication With Restraints Occupant Classification System Module), refer to 418-00 to diagnosis the communication concern before continuing with this pinpoint test.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was on-demand DTC B2437 retrieved? 
    1. YES  : This is a hard fault. The fault condition is still 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  Q2.
    2. 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  Q5.
  2. Q2 CHECK CIRCUIT CR203 (GY/VT) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: RCM C310a and C310b
    • Disconnect: Passenger Safety Belt Buckle Switch C3066
    • Disconnect: Passenger Seat Side Air Bag Module C327
    • Disconnect: Passenger Safety Belt Buckle Pretensioner C3202
    • 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 1: Measuring Voltage Between Passenger Safety Belt Buckle Switch C3066-2, Circuit CR203 (GY/VT) & Ground
      G04011523Courtesy of FORD MOTOR CO.
    • Measure the voltage between passenger seat belt buckle switch C3066-2, circuit CR203 (GY/VT), harness side and ground.
    • Is the voltage less than 0.2 volt? 
    1. YES  : Go to  Q3.
    2. NO  : REPAIR circuit CR203 (GY/VT). Go to  Q6.
  3. Q3 CHECK CIRCUIT GD143 (BK/VT) FOR AN OPEN 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
      • Fig 2: Measuring Resistance Between Passenger Safety Belt Buckle Switch C3066-1, Circuit GD143 (BK/VT) & Ground
      G03946403Courtesy of FORD MOTOR CO.
    • Measure the resistance between passenger safety belt buckle switch C3066-1, circuit GD143 (BK/VT), harness side and ground.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  Q4.
    2. NO  : REPAIR circuit GD143 (BK/VT). Go to  Q6.
  4. Q4 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system 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  Q6.
    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 any electrical connector that were disconnected. Go to  Q5.
  5. Q5 CHECK FOR AN INTERMITTENT FAULT 
    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  Q2.
    2. NO  : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. Go to  Q6.
  6. Q6 CHECK FOR ADDITIONAL DTCs 
    • Refer to the continuous memory DTCs recorded during Step Q1.
    • Were any continuous memory DTCs retrieved during Step Q1? 
    1. YES  : Do not clear any DTCs until all DTCs have been resolved. Go to the Supplemental Restraint System (SRS) Diagnostic Trouble Code (DTC) Chart  for pinpoint test direction.
    2. NO  : RECONNECT the SRS. If previously directed to depower the SRS, REPOWER the SRS REFER to Supplemental Restraint System (SRS) Depowering and Repowering . PROVE OUT the SRS. CLEAR all OCSM and RCM DTCs.
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