Probable Causes

Damaged wiring, incorrect ECS module part number installed or incorrect equipment installed.

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 C1415 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC C1415 was not retrieved, fault is intermittent. Go to step  8.
2. Check system configuration
   
   Check system configuration and correct ECS module part number for vehicle. Note if passenger-side air bag should be installed in vehicle. Using scan tool, select MODULE IDENTIFICATION. Retrieve module information. If correct ECS module is installed, go to next step. If correct ECS module is not installed, replace ECS module with correct part number. See ELECTRONIC CRASH SENSOR (ECS) MODULE  under REMOVAL & INSTALLATION. Go to step  9.
3. Check passenger-side air bag equipment
   
   Check passenger-side air bag equipment list. If passenger-side air bag should be installed in vehicle, verify that it is installed. Go to next step. If passenger-side air bag should not be installed in vehicle, check if passenger-side air bag module is installed. Go to next step.
4. Check passenger-side air bag installation
   
   Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Remove passenger-side air bag trim panel. If passenger-side air bag module is installed and vehicle should be equipped, go to next step. If passenger-side air bag module is installed and vehicle should not be equipped, remove air bag module. Verify that passenger-side air bag option connector is connected. Option connector is located on passenger-side air bag module bracket. Go to step  9. If air bag module is not installed and vehicle should be equipped, go to next step. If air bag module is not installed and vehicle should be equipped with passenger-side air bag, install air bag module. Verify that passenger-side air bag option connector is not connected. Go to step  9.
5. Check passenger-side air bag option connector
   
   If passenger-side air bag option connector is connected and vehicle is not equipped with passenger-side air bag, go to next step. If passenger air bag option connector is connected and vehicle is equipped with passenger-side air bag, disconnect passenger-side air bag option connector. Go to step  9. If passenger-side air bag option connector is not connected and vehicle is equipped with passenger-side air bag, go to step  7. If passenger-side air bag option connector is not connected and vehicle is not equipped with passenger-side air bag, connect passenger-side air bag option connector. Go to step  9.
6. Check passenger-side air bag circuit
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access and disconnect ECS module harness connector. See ELECTRONIC CRASH SENSOR (ECS) MODULE  under REMOVAL & INSTALLATION. Measure resistance between harness side of ECS module connector terminals No. 14 (Light Blue/Orange wire, circuit No. 607) and No. 28 (Pink/Black wire, circuit No. 616). See Figure. If resistance is less than 5 ohms, repair short between Light Blue/Orange wire and Pink/Black wire. See WIRING DIAGRAMS . Go to step  9. If resistance is more than 5 ohms, check for causes of intermittent high resistance. Attempt to recreate hard fault by flexing wire harness and cycling ignition frequently. Repair any intermittent problems found. If no intermittent problems are found, replace ECS module. Go to step  9.
7. Check passenger-side air bag option circuit
   
   Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Turn ignition switch to RUN position. Measure voltage in Pink wire between ground and passenger air bag option connector. Option connector is located on passenger-side air bag module bracket. If voltage is less than one volt, repair open in Pink wire. Go to step  9. If voltage is more than one volt, check for causes of an intermittent condition. Repair any intermittent problems found. If no intermittent problems are found, replace ECS module. Go to step  9.
8. Check for intermittent fault
   
   Refer to continuous DTCs recorded in step  1. If DTC retrieved in step  1 was an intermittent fault, check for causes of intermittent condition. Attempt to recreate fault by flexing wire harness and cycling ignition key frequently. Repair any intermittent problems. Go to next step. If no intermittent problems are 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 (DTC) IDENTIFICATION  table. DO NOT clear any DTCs until all DTCs have been resolved. If no continuous 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.