Possible Causes

A right seat belt buckle switch resistance out of range fault could be caused by damaged wiring, terminals, connectors, faulty seat belt buckle switch or a 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 DTCs. See RETRIEVING FAULT CODES  under DIAGNOSTICS. Perform on-demand self-test. See ON-DEMAND SELF-TEST  under DIAGNOSTICS. If DTC B2439 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B2439 was not retrieved, fault is intermittent. Go to step  8 .
2. Check circuit for open between right front seat & RCM
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect connector C310A. See RESTRAINTS CONTROL MODULE  under REMOVAL & INSTALLATION. Disconnect right front seat floor connector C312. Measure resistance between RCM connector C310A, terminal No. 10 and vehicle harness side of right seat floor harness connector C312, terminal No. 10 (Red/Black wire, circuit No. 1514). 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 Red/Black wire. Go to step  9 .
3. Check circuit for open between right front seat & RCM
   
   Measure resistance between RCM connector C310A, terminal No. 9 and vehicle harness side of right seat floor harness connector C312, terminal No. 1 (Tan/Black 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 Tan/Black wire. Go to step  9 .
4. Check circuit for open between right front seat belt buckle switch & RCM
   
   Disconnect right front seat belt buckle switch connector. Measure resistance in Red/Black wire between seat harness side of right seat floor harness connector C312, terminal No. 10 and right front seat belt buckle switch connector. See Figure . If resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, repair open in Red/Black wire. Go to step  9 .
5. Check circuit for open between right front seat belt buckle switch & RCM
   
   Measure resistance in Tan/Black wire between seat harness side of right seat floor harness connector C312, terminal No. 1 and right front seat belt buckle switch connector. If resistance is less than 0.5 ohm, go to next step. If resistance is more than 0.5 ohm, repair open in Tan/Black wire. Go to step  9 .
6. Check seat belt buckle switch
   
   Turn ignition switch to OFF position. Reconnect RCM connector C310A. Install known-good right seat belt buckle. See SEAT BELT BUCKLE  under REMOVAL & INSTALLATION. Position right seat in vehicle. Reconnect right seat floor harness connector C312. Turn ignition switch to RUN position. Perform on-demand self-test. If DTC B2439 was retrieved during on-demand self-test, go to next step. If DTC B2439 was not retrieved during on-demand self-test, 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 right seat belt buckle. Turn ignition switch to RUN position. Perform on-demand self-test. If DTC B2439 was retrieved during on-demand self-test, replace RCM. Go to step  9 . If DTC B2439 was not retrieved during on-demand self-test, fault is corrected. Go to step  9 .
8. Check for intermittent fault
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC B2439 was retrieved during on-demand self-test, go to step  2 . If DTC B2439 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.