No Communication With Driver's Door Module

Check Power Supply - Disconnect 4-pin connector from driver's door module. Measure voltage between ground and Black/White wire at 4-pin connector. If battery voltage is not present, go to next step. If battery voltage is present, go to step 4).
Check Black/White Wire For Short - Remove door lock/seat motor 20-amp circuit breaker from engine compartment fuse box located near battery. Measure resistance between ground and Black/White wire at 4-pin connector. If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair Black/White wire for short to ground and retest.
Check Power At Door Lock/Seat Motor Circuit Breaker - Check for battery voltage at input side of door lock/seat motor 20-amp circuit breaker. If battery voltage is present, repair Black/White wire for open. If battery voltage is not present, repair open power supply to engine compartment fuse box. See POWER DISTRIBUTION article in WIRING DIAGRAM .
Check Ground Circuits - Disconnect 18-pin connector from driver's door module. Measure resistance between ground and both Black wires at 18-pin connector. If resistances are greater than 5 ohms, repair open in Black wire(s) in question and retest. If resistances are less than 5 ohms, see MODULE COMMUNICATIONS NETWORK article for network diagnostics.