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Test B: No Communication With Lighting Control Module (LCM)

  1. Turn ignition switch to OFF position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to ON position. Monitor Lighting Control Module (LCM) PID IGN_LC. If NGS tester does not display UNABLE TO PERFORM TEST/FUNCTION or MODULE NOT RESPONDING: LCM or CHECK IGNITION STATUS/VERIFY CABLE REQUIREMENTS or CHECK CABLE CONNECTIONS, go to next step. If NGS tester displays UNABLE TO PERFORM TEST/FUNCTION or MODULE NOT RESPONDING: LCM or CHECK IGNITION STATUS/VERIFY CABLE REQUIREMENTS or CHECK CABLE CONNECTIONS, go to step  16 .
  2. Monitor LCM PID IGN_LC while turning key to each position. If PID IGN_LC indicates ACCY while in ACCESSORY position and OFF in all other positions, replace LCM. If PID IGN_LC indicates ACCY while in RUN position, go to next step. If PID IGN_LC indicates OFF in all positions, go to step  7 .
  3. Turn ignition switch to ON position. Measure voltage between ground and output side of fuse No. 5 (10-amp) in central junction box. If battery voltage does not exist, go to next step. If battery voltage exists, repair open in Red/Yellow wire between central junction box and LCM.
  4. Remove and inspect fuse No. 5 from central junction box. If fuse is blown, go to next step. If fuse is okay, repair open in Brown/Pink wire between central junction box and ignition switch.
  5. Turn ignition switch to OFF position. Disconnect LCM harness connector C206. Disconnect light sensor/amplifier harness connector C243. Measure resistance between ground and terminal No. 17 (Red/Yellow wire) at LCM harness connector C206. See Fig 1 . If resistance is 20 ohms or less, repair short to ground in Red/Yellow wire. If resistance is greater than 20 ohms, go to next step.
  6. Turn ignition switch to OFF position. Connect LCM harness connector C206. Remove fuse No. 5 (10-amp) in central junction box. Measure resistance between ground and output side of fuse No. 5 in central junction box. If resistance is 20 ohms or less, repair autolamp concern. See AUTOLAMP SYSTEMS - CONTINENTAL article. If resistance is greater than 20 ohms, replace LCM.
  7. Turn ignition switch to ON position. Measure voltage at output side of fuse No. 4 (10-amp) in central junction box. If battery voltage exists, go to next step. If battery voltage does not exist, go to step  9 .
  8. Turn ignition switch to OFF position. Disconnect LCM harness connector C208. Turn ignition switch to ON position. Measure voltage between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. See Fig 2 . If battery voltage exists, replace LCM. If battery voltage does not exist, repair open in Black/Pink wire.
  9. Turn ignition switch to OFF position. Remove and inspect fuse No. 4 (10-amp) from central junction box. If fuse is blown, go to next step. If fuse is okay, repair open in Black/Light Green wire between central junction box and ignition switch.
  10. Disconnect driver's door lock switch harness connector C505. Measure resistance between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. If resistance is 10 k/ohms or less, go to next step. If resistance is greater than 10 k/ohms, replace driver's door lock switch.
  11. Disconnect passenger's door lock switch harness connector C602. Measure resistance between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. If resistance is 10 k/ohms or less, go to next step. If resistance is greater than 10 k/ohms, replace passenger's door lock switch.
  12. Disconnect passenger's power window switch harness connector C600. Measure resistance between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. If resistance is 10 k/ohms or less, go to next step. If resistance is greater than 10 k/ohms, replace passenger's power window switch.
  13. Disconnect left rear power window switch harness connector C711. Measure resistance between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. If resistance is 10 k/ohms or less, go to next step. If resistance is greater than 10 k/ohms, replace left rear power window switch.
  14. Disconnect right rear power window switch harness connector C809. Measure resistance between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. If resistance is 10 k/ohms or less, go to next step. If resistance is greater than 10 k/ohms, replace right rear power window switch.
  15. Ensure ignition switch is in OFF position. Connect LCM harness connector C208. Measure resistance by backprobing between ground and terminal No. 2 (Black/Pink wire) at LCM harness connector C208. If resistance is greater than 2 k/ohms, replace LCM. If resistance is 2 k/ohms or less, repair short to ground in Black/Pink wire.
  16. Turn ignition switch to OFF position. Disconnect LCM harness connectors. Measure resistance between ground and terminal No. 13 (Black wire) at LCM harness connector C206. See Fig 1 . Measure resistance between ground and terminal No. 1 (Black wire) at LCM harness connector C207. See Fig 3 . Measure resistance between ground and terminal No. 9 (Black wire) at LCM harness connector C211. See Fig 4 . If all resistances are 5 ohms or less, go to next step. If any resistance is greater than 5 ohms, repair open in appropriate Black wire.
  17. Measure resistance between ground and terminal No. 15 (Black/Light Blue wire) at LCM harness connector C207. If resistance is 5 ohms or less, repair module communication concern. See MODULE COMMUNICATIONS NETWORK - CONTINENTAL article. If resistance is greater than 5 ohms, repair open in Black/Light Blue wire.
Fig 1: Identifying Lighting Control Module Harness Connector C206 Terminals
G98F01672Courtesy of FORD MOTOR CO.
Fig 2: Identifying Lighting Control Module Harness Connector C208 Terminals
G98G00386Courtesy of FORD MOTOR CO.
Fig 3: Identifying Lighting Control Module Harness Connector C207 Terminals
G98I00388Courtesy of FORD MOTOR CO.
Fig 4: Identifying Lighting Control Module Harness Connector C211 Terminals
G98J00389Courtesy of FORD MOTOR CO.
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