LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2002 >> ZX2 Automatic >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Remote Keyless Entry Systems >> System Tests >> Test C: No Communication With Rap Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test C: No Communication With Rap Module

NOTE: Remote Anti-Theft Personality (RAP) module is located in luggage compartment, behind right trim panel. See Figure. For RAP module connectors C404 and C405 terminal identification, refer to illustrations. See Figure and Figure .
  1. Turn ignition switch to LOCK position. Check condition of central junction box MIRROR/RADIO fuse (5-amp) and ROOM fuse (10-amp). Central junction box is located above left side kick panel. If fuses are okay, reinstall fuses and go to step  4. If ROOM fuse is blown, go to next step. If MIRROR/RADIO fuse is blown, go to step  3.
  2. Ensure ignition switch is in LOCK position. Disconnect Remote Anti-Theft Personality (RAP) module 22-pin harness connector C404. Replace ROOM fuse. Check condition of replaced ROOM fuse. If fuse is okay, replace RAP module. See REMOTE ANTI-THEFT PERSONALITY MODULE  under REMOVAL & INSTALLATION. Retest system operation. If fuse is blown, repair short to ground in Blue/Red wire between central junction box ROOM fuse and RAP module. Retest system operation.
  3. Ensure ignition switch is in LOCK position. Disconnect Remote Anti-Theft Personality (RAP) module 26-pin harness connector C405. Replace MIRROR/RADIO fuse. Turn ignition switch to ON position. Check condition of replaced MIRROR/RADIO fuse. If fuse is okay, replace RAP module. See REMOTE ANTI-THEFT PERSONALITY MODULE  under REMOVAL & INSTALLATION. Retest system operation. If fuse is blown, repair short to ground in Blue/Black wire between central junction box and RAP module. Retest system operation.
  4. Ensure ignition switch is in LOCK position. Disconnect Remote Anti-Theft Personality (RAP) module 22-pin harness connector C404 and RAP module 26-pin harness connector C405. On all door system, check resistance between ground and RAP module 22-pin harness connector C404 terminal No. 14 (Black wire). See Figure. On driver's door system, measure resistance between ground and RAP module 26-pin harness connector C405 terminal No. 24. See Figure. On all models, if resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between ground and RAP module. Retest system operation.
  5. Measure voltage between ground and RAP module 22-pin harness connector C404 terminal No. 12 (Blue/Red wire). See Figure. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair Blue/Red wire between central junction box and RAP module. Retest system operation.
  6. Disconnect RAP module 26-pin harness connector C405. Turn ignition switch to ON position. Measure voltage between ground and RAP module 26-pin harness connector C405 terminal No. 25 (Blue/Black wire). See Figure. If voltage is more than 10 volts, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - ESCORT & ZX2 article. If voltage is 10 volts or less, repair Blue/Black wire between central junction box and RAP module. Retest system operation.
scientia non olet · About LEMON Manuals