Possible Causes

A seat track position sensor short to battery circuit fault could be caused by damaged wiring, terminals or connectors 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 ON 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 C1981 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC C1981 was not retrieved, fault is intermittent. Go to step  6 .
2. Check circuits for open between RCM & seat track position sensor
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Disconnect connector C310B. Disconnect seat track position sensor harness connector. Measure resistance in Light Green wire (circuit No. 1520) between harness side of RCM connector C310B, terminal No. 23 and harness side of seat track position sensor connector. See Figure . See WIRING DIAGRAMS  . 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. Go to step  7 .
3. Check circuits for open between RCM & seat track position sensor
   
   Measure resistance in Light Green wire (circuit No. 1521) between harness side of RCM connector C310B, terminal No. 24 and harness side of 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, repair open in Light Green wire. Go to step  7 .
4. Check circuits for short to voltage
   
   Turn ignition switch to ON position. Measure voltage between ground and harness side of RCM connector, terminal No. 23 (Light Green wire). Measure voltage between ground and harness side of RCM connector, terminal No. 24 (Light Green wire). If voltage is less than 0.2 volt, go to next step. If voltage is more than 0.2 volt, repair short to battery in appropriate wire. Go to step  7 .
   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.
5. Confirm RCM fault
   
   Disconnect negative battery cable and wait at least one minute. Connect harness connector C310A. Connect seat track position sensor harness connector. Connect negative battery cable. Perform on-demand-self-test. If DTC C1981 was retrieved during on-demand self-test, replace RCM. Go to step  7 . If DTC C1981 was not retrieved during on-demand self-test, fault is corrected. Go to step  7 .
6. Check for intermittent DTC
   
   Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC C1981 was retrieved during on-demand self-test, go to step  2 . If DTC C1981 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.
7. 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.