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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1615 (Supplemental Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test AC: DTC C1946 - Front Driver's Seat Track Position Switch Circuit Open >> Pinpoint Test Ac: DTC C1946 - Front Driver's Seat Track Position Switch Circuit Open

Pinpoint Test Ac: DTC C1946 - Front Driver's Seat Track Position Switch Circuit Open

WARNING: This page is about a different car, the 2010 Lincoln Town Car. 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.
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.
WARNING: Always wear eye protection when servicing a vehicle. Failure to follow this instruction may result in serious personal injury.
NOTE: Use the correct probe adapter(s) 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. AC1 CHECK FOR ON-DEMAND AND CONTINUOUS DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was on-demand DTC C1946 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  AC2.
    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  AC6.
  2. AC2 CHECK CIRCUIT 1520 (LG) FOR AN OPEN BETWEEN THE RCM AND DRIVER SEAT 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering .
    • Disconnect: Driver Seat Track Position Sensor C356
    • Disconnect: RCM C310a and C310b
    • Measure the resistance between RCM C310b-23, circuit 1520 (LG), harness side and driver seat track position sensor C356-2, circuit 1520 (LG), harness side.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  AC3.
    2. NO  : REPAIR circuit 1520 (LG). Go to  AC7.
  3. AC3 CHECK CIRCUIT 1558 (TN/BK) FOR AN OPEN BETWEEN THE RCM AND THE DRIVER SEAT 
      Fig 1: Measuring Resistance
      GF0013419Courtesy of FORD MOTOR CO.
    • Measure the resistance between RCM C310b-24, circuit 1558 (TN/BK), harness side and driver seat track position sensor C356-1, circuit 1558 (TN/BK), harness side.
    • Is the resistance less than 0.5 ohm? 
    1. YES  : Go to  AC4.
    2. NO  : REPAIR circuit 1558 (TN/BK). Go to  AC7.
  4. AC4 CHECK THE SEAT TRACK POSITION SENSOR 
    • Connect: RCM C310a and C310b
    • Install a known good driver seat track position sensor. Refer to Seat Position Sensor .
    • Connect: Seat Track Position Sensor C356
    • 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.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was on-demand DTC C1946 retrieved? 
    1. YES  : Go to  AC5.
    2. NO  : Fault corrected. Go to  AC7.
  5. AC5 CONFIRM THE RCM FAULT 
    NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the self test. If not, erroneous DTCs will be recorded.
    1. YES  : INSTALL a new RCM. REFER to Restraints Control Module (RCM) . Go to  AC7.
    2. NO  : Fault corrected. Go to  AC7.
  6. AC6 CHECK FOR AN INTERMITTENT FAULT 
    • Key in OFF position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Was on-demand DTC C1946 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  AC2.
    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. 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  AC7.
  7. AC7 CHECK FOR ADDITIONAL 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).
    • 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 .
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test/ RCM/ Retrieve and Record On-Demand and Continuous Memory DTCs
    • Enter the following diagnostic mode on the diagnostic tool: Clear all RCM Continuous Memory DTCs
    • 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) DIAGNOSTIC TROUBLE CODE INDEX  for pinpoint test direction.
    2. NO  : PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.
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