LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2001 >> ZX2 Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Power Door Lock System & Remote Keyless Entry System) >> Symptom Tests >> Test A: No Communication With Central Security Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test A: No Communication With Central Security Module

WARNING: This page is about a different car, the 2001 Ford Focus and 2000 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect Central Security Module (CSM) 16-pin Green connector C451. Turn ignition switch to RUN position. Measure voltage between ground and CSM connector C451 terminal No. 1 (Orange/White wire). See Fig 1 . If more than 10 volts exists, go to next step. If less than 10 volts exists, repair open in Orange/White wire between Central Junction Box (CJB) and CSM. Recheck system operation.
  2. Measure resistance between ground and CSM connector C451 terminals No. 5 and 11 (both Black wires). If resistance is 5 ohms or less, see appropriate MODULE COMMUNICATIONS NETWORK article to continue diagnosis. If resistance is greater than 5 ohms, repair open in Black wire. Recheck system operation.
Fig 1: Identifying Anti-Theft/Central Locking Control Module Harness Connector C451 & C452 Terminals
G00006276Courtesy of FORD MOTOR CO.
scientia non olet · About LEMON Manuals