Possible Causes

A left-side air bag circuit short to battery or ground could be caused by a short to battery or ground on White/Light Blue wire (circuit 1257), a short to battery or ground on Brown/Light Blue wire (circuit 1258), a short to battery or ground in left-side air bag module or an RCM internal fault.

1. Check for hard or intermittent DTC
   
   Ensure ignition is off. Connect scan tool to 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 B1992 or B1993 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1992 or B1993 was not retrieved, fault is intermittent. Go to step  5 .
2. Check left-side air bag module
   
   Turn ignition off. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Turn ignition switch to RUN position. Perform on-demand self-test. If DTC B1992 is retrieved, go to next step. If DTC B1993 is retrieved, go to step  4 . If DTC B1992 or B1993 is not retrieved, replace left-side air bag module. Go to step  6 .
   CAUTION: DO NOT remove or separate shorting bars from RCM harness connector.
   NOTE: While measuring resistance in following test, operate various electrical systems such as radio, windows and blower motor.
3. Check left-side air bag circuit for short to battery
   
   Turn ignition off. Disconnect negative battery cable. Access RCM and disconnect both harness connectors. See RESTRAINTS CONTROL MODULE  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure resistance between RCM harness connectors C310B, terminal No. 3 (White/Light Blue wire) and C310A, terminal No. 1 (White/Yellow wire). See Figure . If resistance is less than 10 k/ohms, repair short to battery on White/Light Blue or Brown/Light Blue wires. Go to step  6 . If resistance is more than 10 k/ohms, replace RCM. Go to step  6 .
4. Check left-side air bag circuit for short to ground
   
   Turn ignition off. Access RCM and disconnect both harness connectors. See RESTRAINTS CONTROL MODULE  under REMOVAL & INSTALLATION. Measure resistance between ground and RCM harness connector C310B, terminal No. 3 (White/Light Blue wire). See Figure . If resistance is less than 10 k/ohms, repair short to ground on White/Light Blue wire. Go to step  6 . If resistance is more than 10 k/ohms, replace RCM. Go to step  6 .
5. Check for intermittent fault
   
   Refer to continuous DTCs recorded in step  1 . If DTC retrieved in step  1 was a intermittent fault, check for cause of intermittent short to voltage or ground on White/Light Blue and Brown/Light Blue wires. Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Repair any intermittent problems found. Go to next step. If DTC retrieved in step  1 was not a intermittent fault, 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. If no DTCs were retrieved, reconnect air bag system. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Prove out system. Clear all DTCs. See CLEARING FAULT CODES  under DIAGNOSTICS.