Test L: Instrument Cluster 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.
NOTE:
Instrument cluster may also be referred to as Hybrid Electronic Cluster (HEC).
- Turn ignition switch to LOCK position. Disconnect instrument cluster 12-pin harness connector C254. 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 VIC: NO RESPONSE ON CKT 914 (BUS +), go to next step. If NGS tester does not indicate VIC: NO RESPONSE ON CKT 914 (BUS +), go to step 3.
- Turn ignition switch to LOCK position. Disconnect NGS tester. Disconnect instrument cluster harness connector C254. Using an ohmmeter, measure resistance in Tan/Orange wire between terminal No. 18 at instrument cluster harness connector C254 and terminal No. 2 at Data Link Connector (DLC). See Figure and Fig 1 . If resistance is less than 5 ohms, replace instrument cluster and retest system for normal operation. If resistance is 5 ohms or greater, repair open in Tan/Orange wire between instrument cluster harness connector C254 and DLC. Retest system for normal operation.
- Turn ignition switch to LOCK position. Disconnect NGS tester. Disconnect instrument cluster harness connector C254. Measure resistance in Pink/Light Blue wire between terminal No. 17 at instrument cluster harness connector C254 and terminal No. 10 at DLC. See Figure and Fig 1 . If resistance is less than 5 ohms, replace instrument cluster and retest system for normal operation. If resistance is 5 ohms or greater, repair open in Pink/Light Blue wire between instrument cluster harness connector C254 and DLC. Retest system for normal operation.