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Power Seat Systems Diagnostic System Check

NOTE: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The presence of DTCs which begin with "U" indicate some other module is not communicating. The check will determine if any internal controller or system voltage DTCs are set.
  1. Connect scan tool. Turn ignition on. If scan tool powers up, go to next step. If scan tool does not power up, see TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on. Try to establish communication with Driver's Door Module (DDM), Passenger Front Door Module (PFDM), Left Rear Door Module (LRDM), Right Rear Door Module (RRDM), Driver's Door Switch Assembly (DDSA) and Memory Seat Module (MSM). If scan tool communicates with all modules listed, go to next step. If scan tool does not communicate with all modules listed, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Cycle ignition switch through all positions. Observe CLASS 2 POWER MODE parameter under DIAGNOSTIC CIRCUIT CHECK on scan tool. If displayed CLASS 2 POWER MODE parameter matches actual ignition switch position, go to next step. If displayed CLASS 2 POWER MODE parameter does not match actual ignition switch position, see TEST C: POWER MODE MISMATCH  under SYSTEM TESTS.
  4. With scan tool, select display DTCs function for Driver's Door Module (DDM), Passenger Front Door Module (PFDM), Left Rear Door Module (LRDM), Right Rear Door Module (RRDM), Driver's Door Switch Assembly (DDSA) and Memory Seat Module (MSM). If scan tool displays any DTCs for any modules mentioned, go to next step. If scan tool does not display any DTCs, see POWER SEATS - DEVILLE article for further diagnosis.
  5. If scan tool does not display any DTCs that begin with a "U", go to next step. If scan tool displays any DTCs that begin with "U", see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  6. If scan tool does not display DTC B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTC B1000, B1004, B1007 or B1009, go to step DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  7. If scan tool displays DTC B1327 or B1328, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in GENERATORS & REGULATORS - DEVILLE article in STARTING & CHARGING SYSTEMS. If scan tool does not display B1327 or B1328, diagnose any other DTCs that are present. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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