Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1999 Ford Taurus SHOFACTORY OEM SERVICE PROCEDURE
Test M: Smart Lock Feature Does Not Operate Properly
- Turn ignition switch to LOCK position, leaving key in ignition. Open driver's door. If warning chime sounds, go to next step. If warning chime does not sound, repair warning chime system. See appropriate wiring diagram in WARNING SYSTEMS article.
- Using driver's door lock switch, lock vehicle. If doors lock, go to next step. If doors do not lock, repair power door lock system. See appropriate POWER DOOR LOCKS & TRUNK RELEASE article.
- Disconnect Generic Electronic Module (GEM) harness connector C248. Measure voltage between ground and terminal No. 11 (Pink/Yellow wire) at GEM harness connector C248. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Pink/Yellow wire between terminal No. 11 at GEM harness connector C248, splice S201 (located at left kick panel) and terminal No. 85 at all door lock relay harness connector C255. See WIRING DIAGRAMS .
- Measure voltage in between ground and terminal No. 1 (Pink/Light Green wire) at GEM harness connector C248. If battery voltage exists, replace GEM. If battery voltage does not exist, repair Pink/Light Green wire between terminal No. 1 at GEM harness connector C248, splice S200 (located at left kick panel) and terminal No. 85 at all door unlock relay. See WIRING DIAGRAMS .
Factory Service Tools
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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.