Test A: No Communication With Central Security Module

NOTE: Central Security Module (CSM) may also be referred to as anti-theft/central locking module.

1. Disconnect Central Security Module (CSM) Green 16-pin connector C451a. See Fig 1 . Measure resistance of Orange/White wire between CSM connector C451a terminal No. 1 and output side of fuse No. 25 (20-amp) in Central Junction Block (CJB). See Fig 2 and Fig 3 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange/White wire.
2. Measure resistance between ground and CSM connector C451a terminal No. 5 (Black wire). If resistance is less than 5 ohms, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - COUGAR article. If resistance is 5 ohms or more, repair open in Black wire between ground and CSM.

Fig 1: Locating Central Security Module (CSM) & In-Line Connectors Near Passenger's "A" Pillar

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Central Security Module 16-Pin Harness Connectors C451a & C451b Terminals

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Central Junction Box Connectors & Terminals

Courtesy of FORD MOTOR CO.