No Communication With Driver Door Module
- Disconnect Driver Door Module (DDM) 4-pin connector. Measure voltage between ground and DDM 4-pin connector Black/White wire. If battery voltage is present, go to step 4). If battery voltage is not present, go to next step.
- Remove circuit breaker No. 14 (20-amp DOOR LOCKS/SEAT MOTOR). On Crown Victoria and Grand Marquis, circuit breaker is located in underhood fuse panel. On Town Car, circuit breaker is located in underdash fuse panel. Measure resistance between ground and DDM 4-pin connector Black/White wire. If resistance is less than 10 k/ohms, repair short to ground in Black/White wire between DDM connector and circuit breaker. If resistance is more than 10 k/ohms, go to next step.
- Measure voltage between ground and input cavity of circuit breaker No. 14. If battery voltage is present, repair open in Black/White wire between DDM connector and circuit breaker. If battery voltage is not present, repair power supply to circuit breaker. See WIRING DIAGRAMS.
- Disconnect DDM connector C519/C520. See Figure
. Measure resistance between ground and DDM connector C519/C520, terminals No. 4 and 15 (both Black wires). If resistance is 10 k/ohms or more, repair open Black wire(s). If resistance is less than 10 k/ohms, go to MODULE COMMUNICATIONS NETWORK article.