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.
2000 Lincoln LS 3.0 S, AutomaticFACTORY OEM SERVICE PROCEDURE
Test Q: One-Touch Down Feature Does Not Operate Properly
- Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Using NGS tester, perform Driver's Door Module (DDM) self-test. If DDM DTC B1400 is retrieved, go to step 6 . If any other DDM DTC is retrieved, see DRIVER'S DOOR MODULE DTC INDEX table under SELF-DIAGNOSTIC SYSTEM. If no DDM DTCs are retrieved, go to next step.
- Turn ignition switch to LOCK position. Remove driver's control switch. Perform DRIVER'S CONTROL SWITCH test under COMPONENT TESTS. If switch is okay, go to next step. If switch is faulty, replace driver's control switch.
- Measure resistance between driver's control switch 16-pin harness connector C504 terminal No. 4 (Yellow/Black wire) and ground. See Figure . If resistance is greater than 10 k/ohms, go to step 5 . If resistance is less than 10 k/ohms, go to next step.
- Disconnect DDM 26-pin harness connector C501d. Measure resistance between driver's control switch 16-pin harness connector C504 terminal No. 4 (Yellow/Black wire) and ground. If resistance is greater than 10 k/ohms, replace DDM. If resistance is less than 10 k/ohms, repair short to ground in Yellow/Black wire and retest system operation.
- Disconnect DDM 26-pin harness connector C501d. Measure resistance in Yellow/Black wire between driver's control switch 16-pin harness connector C504 terminal No. 4 and DDM 26-pin harness connector C501d terminal No. 21. See Figure . If resistance is less than 5 ohms, replace DDM. If resistance is greater than 5 ohms, repair open in Yellow/Black wire and retest system operation.
- Turn ignition switch to RUN position. Using NGS tester, monitor DDM PID OTD_SW. Disconnect driver's control switch 16-pin harness connector C504. If DDM PID changes when switch 16-pin harness connector C504 is disconnected, replace driver's control switch. If DDM PID does not change when switch 16-pin harness connector C504 is disconnected, go to next step.
- Turn ignition switch to LOCK position. Disconnect DDM 26-pin harness connector C501d. Turn ignition switch to RUN position. Measure voltage between driver's control switch 16-pin harness connector C504 terminal No. 4 (Yellow/Black wire) and ground. If voltage is greater than 10 volts, repair short to power in Yellow/Black wire and retest system operation. If voltage is less than 10 volts, replace DDM.
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.