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Home >> Ford >> 2000 >> Excursion 7.3 F, 4WD >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System - Excursion & Super Duty >> Diagnostic Tests >> Test G: Driver Air Bag Circuit Short To Ground (DTC B1887) >> Possible Causes

Possible Causes

A driver-side air bag ignitor circuit shorted to ground could be caused by a short to ground on Gray/Orange wire (circuit 614), a short to ground on Gray/White wire (circuit 615), a short to ground in clockspring or a short to ground in air bag module.

  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 B1887 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1887 was not retrieved, fault is intermittent. Go to step  5.

  2. Check driver-side air bag

    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 B1887 is retrieved, go to next step. If DTC B1887 is not retrieved, replace driver-side air bag module. See DRIVER-SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. Go to step  6.
    NOTE: DO NOT remove or separate shorting bars from ECS module harness connector.

  3. Check driver-side air bag circuit

    Turn ignition off. Access ECS module and disconnect harness connector. See ELECTRONIC CRASH SENSOR  under REMOVAL & INSTALLATION. Measure resistance between ECS module harness connector terminals No. 1 (Gray/Orange wire) and No. 21 (Black/Orange wire). See Figure. If resistance is less than 10 k/ohms, go to next step. If resistance is more than 10 k/ohms, replace ECS module. Go to step  6.

  4. Check driver-side air bag wiring & clockspring

    Disconnect driver-side air bag module connector. Disconnect lower clockspring connector located on steering column. Inspect all crimps, terminals, fuses, wires and connectors feeding ECS module harness connector terminals No. 1 (Gray/Orange wire) and No. 15 (Gray/White wire), clockspring and clockspring connectors. See WIRING DIAGRAMS . Also, check for pinched wires and damaged connector terminals. If any damage is found, repair/replace as necessary and go to step  6. If no damage is found, go to step  6.

  5. Check for intermittent fault

    Refer to continuous DTCs recorded in step  1. If DTC retrieved in step  1 was an intermittent fault, check for cause of intermittent short to ground on Gray/Orange wire, Gray/White wire and clockspring assembly. Attempt to recreate fault by driving vehicle, 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 an 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 (DTC) IDENTIFICATION  table. If no continuous 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.
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