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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 219 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Test S: Seat Track Position Sensor Circuit Resistance Out Of Range (DTC C1948) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

A seat track position sensor current out of range fault could be caused by damaged wiring, terminals or connectors, a faulty seat track position sensor or faulty RCM.

  1. Check for hard or intermittent DTC

    Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). See USING SCAN TOOL  under DIAGNOSTICS. Turn ignition switch to RUN position. Retrieve and record any continuous Diagnostic Trouble Codes (DTCs). See RETRIEVING FAULT CODES  under DIAGNOSTICS. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS. If DTC C1948 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC C1948 was not retrieved, fault is intermittent. Go to step  8 .

  2. Check circuit for open between RCM & left front seat

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect harness connector C310B. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Disconnect air bag simulator from left front under-seat harness connector. Measure resistance between harness side of RCM connector C310B, terminal No. 23 and harness side of left front under-seat connector C313F, terminal No. 7 (Light Green wire, circuit No. 1520). See Figure & Figure . If resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, repair open in Light Green wire. See WIRING DIAGRAMS  . Go to step  9 .

  3. Check circuit for open between RCM & left front seat

    Measure resistance between harness side of RCM connector C310B, terminal No. 24 and vehicle side of harness side of left front under-seat connector C313F, terminal No. 2 (Light Green/Orange wire, circuit No. 1558). If resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, repair open in Light Green/Orange wire. Go to step  9 .

  4. Check circuit for open between left front seat & seat track position sensor

    Access and disconnect seat track position sensor connector. See SEAT TRACK POSITION SENSOR  under REMOVAL & INSTALLATION. Measure resistance in Light Green wire between harness side of left front under-seat connector C313M, terminal No. 7 and harness side seat track position sensor connector. If resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, replace left front in-seat harness. Go to step  9 .

  5. Check circuit for open between left front seat & seat track position sensor

    Measure resistance in Light Green/Orange wire between harness side of left front under-seat connector C313M, terminal No. 2 and harness side seat track position sensor connector. If resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, replace left front in-seat harness. Go to step  9 .

  6. Check seat track position sensor

    Install a known-good seat track position sensor. Disconnect air bag simulators from right and left front under-seat harness connectors. Disconnect right and left front seat belt buckle harness connectors at buckles. Install front seat(s). DO NOT activate air bag system at this time. Install Air Bag Simulators (418-F395/014-R1079) on harness side of right and left front seat belt buckle harness connectors. Reconnect right and left front under-seat harness connectors. Reconnect RCM harness connector C310B. Perform on-demand-self-test. If DTC C1948 was retrieved during on-demand self-test, go to next step. If DTC C1948 was not retrieved, fault is corrected. Go to step  9 .
    NOTE: Ensure all air bag system simulators, sensor electrical connectors and RCM electrical connectors are connected prior to carrying out on-demand self-test or erroneous faults may be set.

  7. Confirm RCM fault

    Turn ignition switch to OFF position. Reinstall original seat track position sensor. Perform on-demand-self-test. If DTC C1948 was retrieved during on-demand self-test, replace RCM. Go to step  9 . If DTC C1948 was not retrieved during on-demand self-test, fault is corrected. Go to step  9 .

  8. Check for intermittent DTC

    Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC C1948 was retrieved during on-demand self-test, go to step  2 . If DTC C1948 was not retrieved during on-demand self-test, check for cause of intermittent fault. Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Repair any intermittent problems found. Go to next step.

  9. Check for additional DTCs

    Refer to continuous DTCs recorded in step  1 . If any continuous DTCs were retrieved, go to diagnostic trouble code identification table for direction to appropriate test. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. DO NOT clear any DTCs until all DTCs have been resolved. If no DTCs were retrieved, reconnect air bag system. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.
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