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Test F: Restraint Control Module Does Not Respond To NGS Tester

WARNING: This page is about a different car, the 2001 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Depending on module configuration, with all modules connected and with ignition switch in RUN position or with engine running, 2-3 volts may be present at Data Link Connector (DLC) terminal No. 7 (Light Blue/White wire). This is the International Standards Organization (ISO) 9141 diagnostic communications network circuit.
  1. Inspect New Generation Star (NGS) tester connector and Data Link Connector (DLC) for loose, damaged or corroded terminals. Repair connector(s) as necessary and retest system for normal operation. If connectors are okay, deactivate air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Disconnect Restraint Control Module (RCM) harness connector C204. RCM is located under instrument panel, mounted on center tunnel. See Figure. Inspect harness connector for loose, damaged or corroded terminals. Repair harness connector as necessary and retest system for normal operation. If harness connector is okay, go to next step.
  2. Turn ignition switch to LOCK position. Measure resistance in Light Blue/White wire between RCM harness connector C204 terminal No. 4 and DLC terminal No. 7. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is 5 ohms or more, repair open in Light Blue/White wire between RCM and DLC. Restore harness connections and test system for normal operation.
  3. Turn ignition switch to RUN position. Measure voltage between DLC terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). See Figure. If voltage exists at either measurement, repair short to ground or short to voltage in Light Blue/White wire between RCM and DLC. If voltage is not indicated in both measurements, replace RCM. Retest system for normal operation.
Fig 1: Identifying Restraint Control Module Harness Connector C204 Terminals
G00035323Courtesy of FORD MOTOR CO.
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