LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2001 >> Windstar Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Module Communications Network System) >> System Tests >> Test L: No Module/Network Communication - ISO 9141
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test L: No Module/Network Communication - ISO 9141

WARNING: This page is about a different car, the 2000 Ford Windstar and 1999 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Depending on module configuration, with all modules connected and with ignition switch in RUN position or with engine running 2-3 volts may be present at Data Link Connector (DLC) terminal No. 7 (Light Blue/White wire). This is the International Standards Organization (ISO) 9141 diagnostic communications network circuit.
NOTE: If repairs to a module communication network circuit is required, see REPAIRING BUS WIRING  . If module replacement is necessary, see PROGRAMMING  and REMOVAL & INSTALLATION  .
  1. Turn ignition switch to OFF position. Inspect Data Link Connector (DLC) terminal No. 7 for damage. If DLC is okay, go to next step. If DLC is damaged, repair as necessary.
  2. Turn ignition switch to OFF position. Deactivate air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Disconnect Restraint Control Module (RCM) 26-pin harness connector C231. Inspect connector for damage. Repair as necessary. Measure resistance between RCM harness connector C231 terminal No. 5 (Light Blue/White wire) and DLC terminal No. 7 (Light Blue/White wire). If resistance is less than 5 ohms and vehicle is equipped with Parking Aid Module (PAM) or Right Power Sliding Door Module (RPSDM), go to next step. If resistance is less than 5 ohms and vehicle is only equipped with RCM, go to step  14 . If resistance 5 ohms or more, repair open in Light Blue/White wire between RCM harness connector C231 and DLC.
  3. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is not present in both measurements and vehicle is equipped with PAM only, go to next step. If voltage is not present in both measurements and vehicle is equipped with RPSDM or Left Power Sliding Door Module (LPSDM), go to step  7 . If voltage is not present in both measurements and vehicle is equipped with RPSDM and PAM, go to step  12 . If voltage is present in both measurements, replace RCM.
  4. Turn ignition switch to OFF position. Disconnect PAM 26-pin harness connector C445. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in either measurement, go to next step. If voltage is not present in both measurements, replace PAM.
  5. Turn ignition switch to OFF position. Disconnect in-line 14-pin harness connector C432. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in either measurement, go to next step. If voltage is not present in both measurements, repair open in Light Blue/White wire between PAM and in-line harness connector C432.
  6. Turn ignition switch to OFF position. Disconnect in-line 16-pin harness connector C292. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in either measurement, repair short to ground or voltage in Light Blue/White wire between DLC and male half of in-line harness connector C292. If voltage is not present in both measurements, repair short to ground or voltage in Light Blue/White wire between in-line harness connector C432 and in-line harness connector C292.
  7. If vehicle is not equipped with LPSDM, go to next step. If vehicle is equipped with LPSDM, go to step  10 .
  8. Turn ignition switch to OFF position. Disconnect RPSDM 12-pin harness connector C352. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in either measurement, go to next step. If voltage is not present in both measurements, replace RPSDM.
  9. Turn ignition switch to OFF position. Disconnect in-line 16-pin harness connector C292. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in either measurement, repair short to ground or voltage in Light Blue/White wire between DLC and male half of in-line harness connector C292. If voltage is not present in both measurements, repair short to ground or voltage in light Blue/White wire between RPSDM, LPSDM (if equipped), in-line harness connector C432 (if equipped with PAM) and in-line harness connector C292.
  10. Turn ignition switch to OFF position. Disconnect RPSDM 12-pin harness connector C352. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is not present in both measurements, go to next step. If voltage is present in both measurements, replace RPSDM.
  11. Turn ignition switch to OFF position. Disconnect LPSDM 12-pin harness connector C355. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in either measurement, go to step  9 . If voltage is not present in both measurements, replace LPSDM.
  12. Turn ignition switch to OFF position. Disconnect PAM 26-pin connector C445. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is not present in both measurements, go to next step. If voltage is present in both measurements, replace PAM.
  13. Turn ignition switch to OFF position. Disconnect in-line 14-pin harness connector C432. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is not present in both measurements, go to step  7 . If voltage is present in both measurements, repair short to ground or voltage between PAM and in-line harness connector C432.
  14. Turn ignition switch to ON position. Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). Measure voltage between DLC terminals No. 7 (Light Blue/White wire) and No. 16 (Light Blue/White wire). If voltage is present in both measurements, repair short to ground or voltage between DLC and RCM. If voltage is not present in both measurements, replace RCM.
scientia non olet · About LEMON Manuals