Possible Causes

A left seat belt buckle switch short to battery fault could be caused by damaged wiring, terminals, connectors 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 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 B2433 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B2433 was not retrieved, fault is intermittent. Go to step  5 .
2. Check circuit for short to battery
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. On models equipped with side air bag modules, ensure left front seat is removed from vehicle. On all models, access RCM and disconnect connector C310B. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Turn ignition switch to ON position. Measure voltage in Brown/Light Blue wire (circuit No. 85) between ground and harness side of seat belt buckle harness connector. See WIRING DIAGRAMS  . 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 Brown/Light Blue wire. Go to step  6 .
3. Check left front seat belt buckle switch
   
   Turn ignition switch to OFF position. Reconnect RCM connector C310B. Install known good left seat belt buckle switch. See SEAT BELT BUCKLE PRETENSIONER/SWITCH ASSEMBLY  under REMOVAL & INSTALLATION. Position left front seat in vehicle. Reconnect left front seat harness connectors. DO NOT activate air bag system at this time. Turn ignition switch to ON position. Perform on-demand self-test. If DTC B2433 was retrieved during on-demand self-test, go to next step. If DTC B2433 was not retrieved during on-demand self-test, attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Activate other systems in same wire harness. Repair any intermittent problems found. Go to step  6 .
   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.
4. Confirm RCM Fault
   
   Turn ignition switch to OFF position. Reconnect RCM connector C310B. Reconnect left front seat belt buckle switch connector. Turn ignition switch to ON position. Perform on-demand self-test. If DTC B2433 was retrieved during on-demand self-test, replace RCM. Go to step  6 . If DTC B2433 was not retrieved during on-demand self-test, attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Activate other systems in same wire harness. Repair any intermittent problems found. Go to step  6 .
5. 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 B2433 was retrieved during on-demand self-test, go to step  2 . If DTC B2433 was not retrieved during on-demand self-test, check for cause of intermittent fault. See WIRING DIAGRAMS  . Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Activate other systems in same wire harness. Repair any intermittent problems found. Go to next step.
6. 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.