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Test K: No Communication With Driver's Seat Module

CAUTION: Side air bag system must be deactivated for diagnosis of power seat (if equipped). See AIR BAG RESTRAINT SYSTEMS - EXPLORER & MOUNTAINEER article. Air Bag Simulator (418-F088) must be installed under seats to floor connector, and removed before operating vehicle.
NOTE: Before beginning this test, ensure seat and seat track are free from all obstructions. For connector identification, see CONNECTOR IDENTIFICATION  .
  1. If vehicle is equipped with memory seat/mirror feature, go to next step. If vehicle is not equipped with memory seat/memory feature, test power seats for proper operation. If seats do not operate properly, repair by symptom. See SYMPTOM INDEX  table.
  2. Connect NGS tester to Data Link Connector (DLC). Ensure transmission is in Park. Turn ignition on. Using NGS tester, monitor Driver's Seat Module (DSM) PID P/N_SW. If NGS tester displays UNABLE TO PERFORM TEST/FUNCTION, MODULE NOT RESPONDING: DSM, CHECK IGNITION STATUS, VERIFY CABLE REQUIREMENTS or CHECK CABLE CONNECTIONS, go to next step. If NGS tester does not display UNABLE TO PERFORM TEST/FUNCTION, MODULE NOT RESPONDING: DSM, CHECK IGNITION STATUS, VERIFY CABLE REQUIREMENTS or CHECK CABLE CONNECTIONS, go to step  8 .
  3. Turn ignition off. Remove fuse No. 36 (7.5-amp) from central junction box. If fuse is okay, go to next step. If fuse is blown, go to step  5 .
  4. Turn ignition on. Measure voltage at input side of fuse No. 36. If battery voltage exists, go to step  6 . If battery voltage does not exist, replace central junction box.
  5. Turn ignition off. Ensure fuse No. 36 is still removed. Disconnect DSM 22-pin harness connector C337. Measure resistance between ground and Light Green/Yellow wire at DSM 22-pin harness connector C337. If resistance is more than 10 k/ohms, system is okay at this time. Replace fuse and recheck system operation. If resistance is 10 k/ohms or less, repair short to ground in Light Green/Yellow wire.
  6. Turn ignition off. Install fuse No. 36 (7.5-amp). Disconnect DSM 22-pin harness connector C337. Turn ignition on. Measure voltage between ground and Light Green/Yellow wire at DSM 22-pin harness connector C337. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Light Green/Yellow wire.
  7. Measure resistance between ground and Black/White wire at DSM 22-pin harness connector C337. If resistance is less than 5 ohms, repair network concern. See MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article. If resistance is 5 ohms or more, repair open in Black/White wire.
  8. Using NGS tester, monitor DSM PID P/N_SW while moving transmission through entire range. If PID value does not agree with transmission position, go to next step. If PID value agrees with transmission position, replace driver's seat module.
  9. Remove fuse No. 28 (7.5-amp) from central junction box. Disconnect DSM 22-pin harness connector C337. Measure resistance of Red/Black wire between output side of fuse No. 28 and DSM 22-pin harness connector C337. If resistance is 5 ohms or less, repair power distribution circuit as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS. If resistance is more than 5 ohms, repair open in Red/Black wire.
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