Door Lock Relay Test
WARNING: This page is about a different car, the 1997 Mercury Tracer and 1997 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
- Remove and disconnect door lock relay. See DOOR LOCK RELAY under REMOVAL & INSTALLATION. Measure resistance between door lock relay terminal No. 5 and terminals No. 2, 4, 7 and 9. See Fig 1 . All resistances should be 150-185 ohms.
- Measure resistance between door lock 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 door lock relay.
- Apply battery positive to relay terminal No. 5 and battery negative to relay terminal No. 1. Measure voltage between battery negative and relay terminal No. 7. See Fig 1 . Apply battery positive to relay terminal No. 5 and battery negative to relay terminal No. 2. Measure voltage between battery negative and relay terminal No. 6.
- Apply battery positive to relay terminal No. 5 and battery negative to relay terminal No. 3. Measure voltage between battery negative and relay terminal No. 4. See Fig 1 . Apply battery positive to relay terminal No. 5 and battery negative to relay terminal No. 8. Measure voltage between battery negative and relay terminal No. 9.
- Voltage in all tests should be greater than 10 volts. If voltage is not as specified, replace door lock relay. If voltages are as specified, relay is functioning properly.