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 Navigator RWDFACTORY OEM SERVICE PROCEDURE
Test D: One-Touch Down Feature Inoperative
NOTE:
After repair, clear Diagnostic Trouble Codes (DTCs) and retest system.
- Using New Generation Star (NGS) tester, perform Generic Electronic Module (GEM) self-test. If no DTCs, DTC B1398 or DTC B1400 exists, go to next step. If DTCs B1405 or B1410 exists, go to TEST C: SINGLE WINDOW INOPERATIVE (ALL OTHER WINDOWS OPERATE) . If DTC B1342 exists, replace GEM. See GENERIC ELECTRONIC MODULE (GEM) under REMOVAL & INSTALLATION.
- Turn ignition switch to RUN position. Using NGS tester, trigger GEM active command ACCY RLY to ON. Observe GEM PID D_PWRLY while triggering GEM active command ONE TOUCH to ON and OFF. If PID value agrees with command mode, go to TEST C: SINGLE WINDOW INOPERATIVE (ALL OTHER WINDOWS OPERATE) . If PID does not agree with command mode and displays OFFO-G, go to next step. If PID does not agree with command mode and displays ON-B-, go to step 6 .
- Turn ignition switch to LOCK position. Remove one-touch down relay. Check one-touch down relay from Central Junction Box (CJB). CJB is located behind left side of instrument panel. See MINI RELAYS under COMPONENT TESTS. If one-touch down relay is okay, go to next step. If one-touch down relay is faulty, replace one-touch down relay.
- Remove accessory delay relay from Central Junction Box (CJB). CJB is located behind left side of instrument panel. Measure resistance between accessory delay relay socket terminal No. 87 and one-touch down relay socket terminal No. 85. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace CJB.
- Disconnect GEM from CJB 18-pin harness connector C267. Measure resistance between one-touch down relay socket terminal No. 86 and CJB connector C267 terminal No. 2. See Figure and Figure . Resistance should be less than 5 ohms. Measure resistance between ground and CJB connector C267 terminal No. 2. Resistance should be 10 k/ohms or more. If resistances are as specified, replace GEM. See GENERIC ELECTRONIC MODULE (GEM) under REMOVAL & INSTALLATION. If either resistance is not as specified, replace CJB.
- Turn ignition switch to LOCK position. Remove one-touch down relay from Central Junction Box (CJB). CJB is located behind left side of instrument panel. Check one-touch down relay. See MINI RELAYS under COMPONENT TESTS. If one-touch down relay is okay, go to next step. If one-touch down relay is faulty, replace one-touch down relay.
- Disconnect GEM 18-pin harness connector C267. Turn ignition switch to RUN position. Measure voltage between ground and one-touch down relay socket terminal No. 86. See Figure . If voltage exists, replace CJB. If voltage does not exist, replace GEM. See GENERIC ELECTRONIC MODULE (GEM) under REMOVAL & INSTALLATION.
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.