Remove and disconnect power door lock/unlock relay located behind passenger kick panel. Measure resistance between power door lock/unlock relay terminal No. 5 and terminals No. 2, 4, 7 and 9. See Fig 1 . All resistances should be 150-185 ohms. If resistances are not as specified, replace power door lock/unlock relay.
Measure resistance between power door lock/unlock relay terminal No. 6 and terminals No. 3, 8 and 12. See Fig 1 . All resistances should be less than 5 ohms. If all resistances are as specified, go to next step. If resistances are not as specified, replace power door lock/unlock relay.
Apply battery voltage to relay terminal No. 5 and ground to relay terminal No. 1. Measure voltage between ground and relay terminal No. 7. See Fig 1 . Apply battery voltage to relay terminal No. 5 and ground to relay terminal No. 2. Measure voltage between ground and relay terminal No. 6.
Apply battery voltage to relay terminal No. 5 and ground to relay terminal No. 3. Measure voltage between ground and relay terminal No. 4. See Fig 1 . Apply battery voltage to relay terminal No. 5 and ground to relay terminal No. 8. Measure voltage between ground and relay terminal No. 9.
Voltage in all tests should be more than 10 volts. If voltage is not as specified, replace power door lock/unlock relay. If all voltages are as specified, relay is functioning properly.

Fig 1: Identifying Door Lock/Unlock Relay Terminals

Courtesy of FORD MOTOR CO.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Power Door Lock/Unlock Relay