Test A: No Communication With Driver's Seat Module
WARNING:
Vehicle may be equipped with side air bags and seat belt pretensioners. Before testing or repairing power seat system, disable restraint system. See AIR BAG RESTRAINT SYSTEMS - LS article. For any diagnostic or service to power seats equipped with side air bags, use Air Bag Simulators (418-133). Air bag simulators must be installed to air bag floor harness connector, and removed prior to operating vehicle. For any diagnostic or service to power seats equipped with seat belt pretensioners, use Pretensioners Simulators (418-F088). Pretensioners simulators must be installed to pretensioners floor harness connector, and removed prior to operating vehicle.
NOTE:
After any repairs are complete, ensure all component are properly installed and all harness connectors are connected properly and repeat data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in appropriate MODULE COMMUNICATIONS NETWORK - LS article.
- Using New Generation Star (NGS) tester, clear Driver's Door Module (DDM) DTCs. Perform DDM self-test. If NGS tester communicates with DDM, go to next step. If NGS tester does not communicate with DDM, go to TEST B: NO COMMUNICATION WITH DRIVER'S DOOR MODULE .
- Turn ignition switch to LOCK position. Disconnect Driver's Seat Module (DSM) 17-pin harness connectors C341c. Disconnect DSM 4-pin harness connectors C341b. DSM is located under driver's seat. Measure voltage between ground and DSM harness connector C341c terminal No. 10 (Orange/White wire). See Fig 1 . Measure voltage between ground and DSM harness connector C341b terminal No. 2 (Red wire). If both voltages are 10 volts or more, go to next step. If either voltage is less than 10 volts, repair open or short to ground in appropriate wire(s). See POWER DISTRIBUTION article in WIRING DIAGRAMS.
- Ensure ignition switch is in LOCK position. Measure resistance between ground and DSM harness connector C341b terminal No. 4 (Black wire). Measure resistance between ground and DSM harness connector C341c terminal No. 2 (Brown/White wire). If both resistances are less than 5 ohms, repair module communication concern. See MODULE COMMUNICATIONS NETWORK - LS article. If either resistance is 5 ohms or more, repair open in appropriate Black wire between DSM and ground. Ground point is located under driver's seat. See GROUND DISTRIBUTION article in WIRING DIAGRAMS.