Test I: Safety Belt Indicator Does Not Operate Correctly (Chime Okay)

WARNING: This page is about a different car, the 2002 Lincoln Navigator and 2002 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: After making any repairs, clear DTCs and perform self-test.

Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below center of instrument panel, right of steering column. Turn ignition switch to RUN position. Observe GEM PID SBLTLMP while toggling active command SBLTLIGHT OFF and ON. If PID does not display OFF---, ON---, go to next step. If GEM PID SBLTLMP displays OFF---, ON---, go to step 4.
Turn ignition switch to LOCK position. Disconnect GEM Gray harness connector C239. GEM is located on back side of central junction box, under left side of instrument panel. Turn ignition switch to RUN position. If safety belt indicator stays on continuously, go to next step. If safety belt indicator does not stay on, go to step 4.
Turn ignition switch to LOCK position. Disconnect instrument cluster harness connector C237. Measure resistance between ground and GEM 26-pin harness connector C239 terminal No. 12 (Dark Green/Light Green wire). See Figure. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Dark Green/Light Green wire between instrument cluster and GEM.
Disconnect all GEM harness connectors. Inspect harness connectors for corrosion and pushed out pins. Connect all GEM harness connectors, ensuring they are connected correctly. Operate system and verify if concern is still present. If concern is still present, replace GEM. See GENERIC ELECTRONIC MODULE/CENTRAL TIMER MODULE under REMOVAL & INSTALLATION. If concern is not present, system is operating correctly at this time. Clear DTCs and perform self-test.