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Test A: No Communication With Lighting Control Module

  1. Turn ignition off. Connect New Generation Star (NGS) tester. Turn ignition switch to RUN position. Using NGS tester, monitor LCM PID IGN_LC. If NGS tester displays UNABLE TO PERFORM TEST/FUNCTION - MODULE NOT RESPONDING: LCM - CHECK IGNITION STATUS/VERIFY CABLE REQUIREMENTS - CHECK CABLE CONNECTION, go to step  8 . If NGS tester display is not as specified, go to next step.
  2. Using NGS tester, monitor LCM PID IGN_LC while rotating ignition switch through ACC, OFF, and RUN positions. If PID IGN_LC does not indicate OFF while in all positions, go to next step. If PID IGN_LC indicates OFF while in all positions, go to step  5 .
  3. Using a voltmeter, check voltage between ground and output side (top terminal) of fuse junction panel fuse No. 14 (7.5-amp). If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, repair Red/Yellow wire between fuse junction panel fuse No. 14 and LCM and retest system operation.
  4. Check fuse junction panel fuse No. 14 (7.5-amp). If fuse is okay, repair White/Yellow wire between fuse junction panel and ignition switch and retest system operation. If fuse is not okay, repair Red/Yellow wire between fuse junction panel fuse No. 14 and LCM. Replace fuse and retest system operation.
  5. Using a voltmeter, check voltage between ground and output side (top terminal) of fuse junction panel fuse No. 18 (7.5-amp). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step  7 .
  6. Turn ignition off. Disconnect LCM 12-pin connector C220 located behind center of instrument panel. Turn ignition switch to RUN position. Using a voltmeter, check voltage between ground and LCM 12-pin connector C220, terminal No. 6 (Dark Blue/Light Green wire). See Fig 1 . If voltage is more than 10 volts, replace LCM and retest system operation. If voltage is 10 volts or less, repair Dark Blue/Light Green wire between fuse junction panel fuse No. 18 and LCM and retest system operation.
  7. Check fuse junction panel fuse No. 18 (7.5-amp). If fuse is okay, repair Black/Light Green wire between fuse junction panel and ignition switch and retest system operation. If fuse is not okay, repair Dark Blue/Light Green wire between fuse junction panel fuse No. 18 and LCM. Replace fuse and retest system operation.
  8. Using a voltmeter, check voltage between ground and output side (left terminal) of fuse junction panel fuse No. 31 (7.5-amp). If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, go to step  12 .
  9. Check fuse junction panel fuse No. 31 (7.5-amp). If fuse is okay, repair Dark Blue/Orange wire between fuse junction panel and power distribution box and retest system operation. If fuse is not okay, go to next step.
  10. Turn ignition off. Remove and disconnect headlight switch. Disconnect LCM 16-pin connector C221 located behind center of instrument panel. Using an ohmmeter, check resistance between ground and LCM 16-pin connector C221, terminal No. 25 (Orange/White wire). See Fig 1 . If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Orange/White wire between fuse junction panel fuse No. 31 and LCM and retest system operation.
  11. Connect and install headlight switch. Using an ohmmeter, check resistance between ground and LCM 16-pin connector C221, terminal No. 25 (Orange/White wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, replace headlight switch and retest system operation.
  12. Disconnect LCM 16-pin connector C221 located behind center of instrument panel. Using a voltmeter, check voltage between ground and LCM 16-pin connector C221, terminal No. 25 (Orange/White wire). See Fig 1 . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Orange/White wire between fuse junction panel fuse No. 31 and LCM and retest system operation.
  13. Disconnect LCM 13-pin connector C222 located behind center of instrument panel. Ensure ignition is off. Using an ohmmeter, check resistance between ground and LCM 16-pin connector C221 terminal No. 23 (Pink/Orange wire). See Fig 1 . Check resistance between ground and LCM 13-pin connector C222, terminal No. 13 (Pink/Orange wire). If both resistances are less than 5 ohms, see appropriate MODULE COMMUNICATIONS NETWORK article to continue diagnosis. If either resistances is 5 ohms or more, repair open in appropriate Pink/Orange wire between LCM and ground and retest system operation.
Fig 1: Identifying Lighting Control Module (LCM) Connectors C220, C221 & C222
G98B00373Courtesy of FORD MOTOR CO.
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