Power Door Lock System Test
- Check Door Lock Fuse
Access interior fuse panel. Is Power Door Lock Fuse (30 amp) ok? If yes then go to step 4
. If fuse is not OK, go to next step.
- Check System
Replace power door lock fuse (30 amp). Turn ignition switch to ON position. Does fuse blow again? If yes, then go to next step. If not, then go to step 4
.
- Check For Short To Ground
Turn ignition switch to OFF position. Disconnect White/Green wire from power door lock fuse. See WIRING DIAGRAMS
. Measure resistance of on end of White/Green wire to ground. Is the resistance less than 5 ohms? If yes, then repair White/Green wire between door lock fuse and power door lock relay. See Fig 1
. See WIRING DIAGRAMS
. If resistance is more than 5 ohms, replace power door lock relay.
- Check Power Supply To Relay
Access power door lock relay. Turn ignition switch to ON position. Measure voltage at White/Green wire at power door lock relay connector. See Fig 1
. See WIRING DIAGRAMS
. Is the voltage greater than 10 volts? If yes, then go to next step. If not, then repair White/Green wire between power door lock relay and fuse (30 amp).
- Check Relay Ground
Turn ignition switch to OFF position. Measure resistance of Black wire between power door lock relay and ground. See Fig 1
. See WIRING DIAGRAMS
. Is the resistance less than 5 ohms? If yes, then go to next step. If not, then repair Black wire between power door lock relay and ground.
- Check Power Door Lock Switch
Access power door lock switch in drivers door. See DOOR LOCK SWITCH
under REMOVAL & INSTALLATION. Put door lock switch in UNLOCK position. As you unlock the door, measure the resistance between the Green/Black wire and the Green/Red wire at the connector. See Fig 1
. See WIRING DIAGRAMS
. As you lock the door, measure the resistance between Green/Black wire and the Blue/Red wire at the connector. Is resistance less than 5 ohms for both switch positions? If yes, then go to next step. If not, then replace power door lock switch.
- Check lead To Power Door Switch
Access power door lock relay. Measure the resistance of the Green/Red wire, Green/Black wire and the Blue/Red wires between the power door lock relay and the power door lock switch. See Fig 1
. See WIRING DIAGRAMS
. Are the resistances less than 5 ohms? If yes, then go to next step. If not, then repair faulty circuit.
- Check Power Door Lock Relay
Check power door lock relay for proper operation. See POWER DOOR LOCK RELAY
under COMPONENT TESTS. Replace relay if faulty. If relay operates as specified, go to next step.
- Check Supply To Power Door Lock Motor
Turn the ignition switch to OFF position. Access power door lock motor. See DOOR LOCK MOTOR
under REMOVAL & INSTALLATION. Measure the resistance of the Green and Red wires between the power door lock relay and the power door lock motor. See Fig 1
. See WIRING DIAGRAMS
. Are the resistances less than 5 ohms? If yes, then go to next step. If not, then repair faulty circuit.
- Check Power Door Lock Motor
Turn the ignition switch to ON position. Unlock and lock the faulty door lock. Did the door lock unlock and lock as directed? If yes, then system is operating correctly at this time. See SYMPTOM INDEX
table for additional symptoms. Replace faulty motor if operation is not as specified. See DOOR LOCK MOTOR
under REMOVAL & INSTALLATION.
Courtesy of FORD MOTOR CO.