Anti-Theft Relay
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
To test the relay, use an ohmmeter to check resistance values between terminals. See Fig 1.
To test relay with voltage, disconnect the ohmmeter. Connect pins 3 and 1 to 12 volt DC power and pin 2 to ground. Measure voltage between pins 5 and 2. If the voltage is 12 volts, continue the test. If the voltage is not 12 volts, replace the relay. Disconnect power from pin 1 and measure voltage between pins 4 and 2. If voltage is 12 volts, the relay is okay. If not, replace the relay.