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No Communication With Lighting Control Module

WARNING: This page is about a different car, the 1997 Mercury Grand Marquis, 1997 Lincoln Town Car, and 1997 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect Lighting Control Module (LCM) connector C2029/C222 located behind left side of instrument panel. See Figure . Measure voltage between ground and LCM connector C2029/C222, terminal No. 6 (Tan/White wire). If battery voltage is present, go to step 5). If battery voltage is not present, go to next step.
  2. Remove 15-amp fuse No. 4 (fuse No. 15 on Town Car) located in underdash fuse panel. Measure resistance between ground and LCM connector C2029/C222, terminal No. 6 (Tan/White wire). If resistance is less than 10 k/ohms, repair short to ground in Tan/White wire. If resistance is more than 10 k/ohms, go to next step.
  3. Measure voltage between ground and fuse No. 4 (fuse No. 15 on Town Car) input cavity. If battery voltage is present, goto next step. If battery voltage is not present, repair power supply to fuse. See WIRING DIAGRAMS  .
  4. Measure resistance between fuse No. 4 (fuse No. 15 on Town Car) output cavity and LCM connector C2029/C222, terminal No. 6 (Tan/White wire). If resistance is 5 ohms or less, replace fuse, reconnect all components and retest system. If resistance is more than 5 ohms, repair open in Tan/White wire.
  5. Measure voltage between ground and LCM connector C2029/C222, terminal No. 11 (Light Green/Yellow wire). If battery voltage is present, go to step 9). If battery voltage is not present, go to next step.
  6. Remove 15-amp fuse No. 8 (fuse No. 4 on Town Car) located in underdash fuse panel. Measure resistance between ground and LCM connector C2029/C222, terminal No. 11 (Light Green/Yellow wire). If resistance is less than 10 k/ohms, repair short to ground in Light Green/Yellow wire. If resistance is more than 10 k/ohms, go to next step.
  7. Measure voltage between ground and fuse No. 8 input cavity. If battery voltage is present, go to next step. If battery voltage is not present, repair power supply to fuse No. 8 (fuse No. 4 on Town Car). See WIRING DIAGRAMS  .
  8. Measure resistance of Light Green/Yellow wire between fuse No. 8 (fuse No. 4 on Town Car) output cavity and LCM connector C2029/C222, terminal 11. If resistance is 5 ohms or less, replace fuse No. 8 (fuse No. 4 on Town Car), restore vehicle and retest system. If resistance is more than 5 ohms, repair open in Light Green/Yellow wire, then retest system.
  9. Measure resistance between ground and LCM connector C2029/C222, terminal No. 9 (Black wire on Crown Victoria and Grand Marquis or Pink/Orange wire on Town Car). If resistance is less than 5 ohms, go to MODULE COMMUNICATIONS NETWORK article to continue diagnosis.

If resistance is more than 5 ohms, repair open in Black wire (Crown Victoria and Grand Marquis) or Pink/Orange wire (Town Car) between LCM connector and ground.

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