Test G: Lighting Control Module (LCM) Does Not Respond To NGS Tester
WARNING: This page is about a different car, the 1999 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition switch to LOCK position. Disconnect LCM 16-pin harness connector C221 located behind left side of instrument panel, right of steering column. 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, reconnect harness connector. Turn ignition switch to RUN position. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM. If NGS tester indicates LCM: NO RESPONSE ON CKT 914 (BUS +), go to next step. If NGS tester does not indicate LCM: NO RESPONSE ON CKT 914 (BUS +), go to step 3.
- Turn ignition switch to LOCK position. Disconnect NGS tester. Disconnect LCM harness connector C221. Measure resistance in Tan/Orange wire between terminal No. 20 at LCM harness connector C221 and terminal No. 2 at Data Link Connector (DLC). See Figure and Fig 1 . If resistance is less than 5 ohms, replace LCM and retest system for normal operation. If resistance is 5 ohms or greater, repair open in Tan/Orange wire between LCM harness connector and DLC. Retest system for normal operation.
- Turn ignition switch to LOCK position. Disconnect NGS tester. Disconnect LCM harness connector C221. Measure resistance in Pink/Light Blue wire between terminal No. 28 at LCM harness connector C221 and terminal No. 10 at DLC. See Figure and Fig 1 . If resistance is less than 5 ohms, replace LCM and retest system for normal operation. If resistance is 5 ohms or greater, repair open in Pink/Light Blue wire between LCM harness connector C221 and DLC. Retest system for normal operation.