TM 10-3930-671-24 Table 2-2.  Unit Troubleshooting Procedures - CONT. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ELECTRICAL SYSTEM (CONT.) 38. HORN DOES NOT OPERATE - CONT. Step 3. Check continuity of horn relay (TB ORD 650). If horn relay has no continuity, replace horn relay (Para 3-22). If horn relay has continuity, replace horn (Para 3-22). 39. ONE OR MORE WARNING LIGHTS DO NOT OPERATE. Step 1. Check continuity across malfunctioning warning light lamp (TB ORD 650). If warning light lamp has no continuity, replace lamp (Para 3-22). If warning light lamp has continuity, go to step 2. Step 2. Check continuity across accessory fuse (TB ORD 650). If accessory fuse has no continuity, replace accessory fuse (Para 3-22). If accessory fuse has continuity, go to step 3. Step 3. Check continuity across warning light switch (TB ORD 650). If warning light switch has no continuity, replace switch (Para 3-22). If warning light switch has continuity, replace warning light lamp assembly (Para 3-22). 40. SEAT BELT WARNING LIGHT DOES NOT OPERATE. Step 1. Check continuity across seat belt light lamp (TB ORD 650). If seat belt light lamp has no continuity, replace lamp (Para 3-22). If seat belt light lamp has continuity, go to step 2. Step 2. Check continuity across ignition fuse (TB ORD 650). If ignition fuse has no continuity, replace ignition fuse (Para 3-22). If ignition fuse has continuity, go to step 3. 2-26