Anti-Theft Relay
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.