Test A: No Communication With Central Security Module
WARNING: This page is about a different car, the 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
After making any repairs, retest system for proper operation.
- Turn ignition switch to LOCK position. Disconnect negative battery cable. Disconnect Central Security Module harness connector C274a. Disconnect CSM module harness connector C274b. Reconnect negative battery cable. Turn ignition switch to RUN position. Measure voltage between ground and CSM module harness connector C274a terminal No. 25 (Red/Yellow wire). Measure voltage between ground and CSM module harness connector C274b terminal No. 12 (Black/White wire). See Fig 1. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in appropriate wire between central junction box and CSM. See WIRING DIAGRAMS .
- Turn ignition switch to LOCK position. Measure resistance between ground and CSM module harness connector C274b terminal No. 13 (Black/Light Blue wire). If resistance is 5 ohms or less, diagnose network fault. See MODULE COMMUNICATIONS NETWORK - BLACKWOOD article. If resistance is more than 5 ohms, repair open in Black/Light Blue wire between CSM module and ground. Ground point is located behind left kick panel. See WIRING DIAGRAMS .