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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 268 (Supplemental Restraint System - Air Bag Restraint Systems) >> Diagnostic Tests >> Test K: Left Seat Belt Buckle Circuit Short To Ground (DTC B2434) >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

A left front seat belt buckle switch short to ground fault could be caused by damaged wiring, terminals, connectors, faulty seat belt buckle switch or 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 USING SCAN TOOL  under DIAGNOSTICS. If DTC B2434 was retrieved during on-demand self-test, fault is hard. Go to next step. If DTC B2434 was not retrieved, fault is intermittent. Go to step  5 .

  2. Check circuit for short to ground between RCM & left front seat belt buckle switch

    Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect connector C310B. See RESTRAINTS CONTROL MODULE (RCM)  under REMOVAL & INSTALLATION. Disconnect left front seat belt buckle switch connector. Measure resistance between ground and harness side of RCM connector C310B, terminal No. 25 (Brown/Light Blue wire, circuit No. 85). See Figure . If resistance is more than one megohm, go to next step. If resistance is less than one megohm, repair short to ground in Brown/Light Blue wire. See WIRING DIAGRAMS  . Go to step  6 .

  3. Check seat belt buckle switch

    Turn ignition switch in OFF position. Connect connector C310B. Install known-good seat belt buckle switch. See SEAT BELT BUCKLE PRETENSIONER/SWITCH ASSEMBLY  under REMOVAL & INSTALLATION. Connect negative battery cable. Perform on-demand self-test. If DTC B2434 was retrieved during on-demand self-test, go to next step. If DTC B2434 was not retrieved, fault is corrected. 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. Install original seat belt buckle switch. Perform on-demand-self-test. If DTC B2434 was retrieved during on-demand self-test, replace RCM. Go to step  6 . If DTC B2434 was not retrieved during on-demand self-test, fault is corrected. Go to step  6 .

  5. Check for intermittent DTC

    Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform on-demand self-test. If DTC B2434 was retrieved during on-demand self-test, go to step  2 . If DTC B2434 was not retrieved during on-demand self-test, check for cause of intermittent fault. Attempt to recreate fault by flexing wire harness and cycling ignition switch frequently. 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.
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