Test A: No Communication With Driver's Door Module
NOTE:
Only vehicles equipped with keyless entry system have a Driver's Door Module (DDM).
NOTE:
Perform all voltage and resistance tests using a Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
- Turn ignition switch to LOCK position. Remove left front door trim panel. See DOOR TRIM PANEL under REMOVAL & INSTALLATION in POWER DOOR LOCKS & TRUNK RELEASE article. Disconnect Driver's Door Module (DDM) 4-pin harness connector C501c, located under left front door trim panel. See Figure. Measure voltage between ground and DDM harness connector C501c terminal No. 4 (Black/White wire). See Fig 1. See POWER DISTRIBUTION in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If voltage is 10 volts or less, go to next step. If voltage is greater than 10 volts, go to step 4.
- Ensure ignition switch is in LOCK position. Remove circuit breaker No. 7 (20-amp) from Battery Junction Box (BJB), located at right front of engine compartment. See Figure. Measure resistance between ground and DDM harness connector C501c terminal No. 4 (Black/White wire). See Fig 1. See POWER DISTRIBUTION in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If resistance is greater than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Black/White wire between DDM and BJB. After repair, test system for normal operation.
- Measure voltage between ground and BJB circuit breaker No. 7 (power supply cavity terminal). See POWER DISTRIBUTION in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If voltage is greater than 10 volts, repair open circuit in Black/White wire between DDM and BJB. If voltage is 10 volts or less, repair open circuit in power supply wire to circuit breaker No. 7 in BJB. After repair, test system for normal operation.
- Ensure ignition switch is in LOCK position. Measure voltage between ground and DDM harness connector C501c terminal No. 3 (Yellow/Light Green wire). See Fig 1. See WIRING DIAGRAMS . If voltage is 10 volts or less, go to next step. If voltage is greater than 10 volts, go to step 7.
- Remove maxi-fuse No. 28 (20-amp) from Central Junction Box (CJB), located behind left side of instrument panel. See Figure. Measure resistance between ground and DDM harness connector C501c terminal No. 3 (Yellow/Light Green wire). See Fig 1. See WIRING DIAGRAMS .If resistance is greater than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Yellow/Light Green wire between CJB and DDM. After repair, test system for normal operation.
- Measure voltage between ground and CJB maxi-fuse No. 28 (power supply cavity terminal). If voltage is greater than 10 volts, repair open circuit in Yellow/Light Green wire between CJB and DDM. If voltage is 10 volts or less, repair open circuit in power supply wire to maxi-fuse No. 28 in CJB. See POWER DISTRIBUTION in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, test system for normal operation.
- Disconnect DDM harness connector C501b, located under left front door trim panel. See Figure. Measure resistance between ground and DDM harness connector C501b terminals No. 4 (Pink/Orange wire) and No. 15 (Black wire). See Fig 2. See POWER GROUND in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If both resistance readings are 5 ohms or less, repair module communications problem. See MODULE COMMUNICATIONS NETWORK - CROWN VICTORIA & GRAND MARQUIS article. If either resistance reading is greater than 5 ohms, repair open circuit in Pink/Orange wire between DDM and ground point G202, located behind left rocker panel, and/or in Black wire between DDM and ground point G200, located behind right rocker panel. See Figure. After repair, test system for normal operation.