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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 267 (Supplemental Inflatable Restraint System - Except F150) >> Diagnostic Tests >> Test N: Passenger-Side Air Bag Deactivation (Pad) Warning Light Short To Battery (DTC B1890) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

A short to battery in PAD switch warning light circuit could be caused by an short to battery in Yellow/Light Green wire (circuit No. 1113), damaged or inoperative PAD switch or damaged or inoperative 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 B1890 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B1890 was not retrieved, fault is intermittent. Go to step  4.

  2. Check PAD switch warning light

    Turn PAD switch to OFF position. If PAD warning light illuminates properly, replace RCM. Go to step  5. If PAD warning light does not illuminate properly, go to next step.

  3. 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. Access RCM and disconnect harness connector. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Access PAD switch and disconnect harness connector. See PASSENGER-SIDE AIR BAG DEACTIVATION (PAD) SWITCH  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure voltage between ground and harness side of RCM connector terminal No. 9 (Yellow/Light Green wire). See Figure. If voltage is more than 0.2 volt, repair short to battery in Yellow/Light Green wire. See WIRING DIAGRAMS . Go to step  5. If voltage is less than 0.2 volt, replace PAD switch. Go to step  5.

  4. 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 B1890 was retrieved during on-demand self-test, fault is hard. Go to step  2. If DTC B1890 was not retrieved, fault is intermittent. Check for cause of intermittent short to battery in Yellow/Light Green wire. See WIRING DIAGRAMS . Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. Repair any intermittent problems found. Go to next step.

  5. 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.
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