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Door System Diagnostic System Check

  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. See Figure . Turn ignition on. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST D: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on. Turn on the headlamp switch. Try to establish scan tool communication with Driver Door Module (DDM) and Powertrain Control Module (PCM). If communication with DDM and PCM is established, go to next step. If communication with DDM and PCM is not established, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
    3. NOTE: Engine may start during this step. Turn engine off as soon crank power mode is observed.
  3. Using scan tool, select CLASS 2 POWER MODE in DIAGNOSTIC CIRCUIT CHECK. Rotate ignition switch through all positions while observing IGNITION SWITCH POWER MODE parameter. If ignition switch parameter reading matches actual ignition switch position for all switch positions, go to next step. If ignition switch parameter reading does not match actual ignition switch position for all switch positions, repair voltage input to body control module as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
    4. NOTE: Engine may start during this step. Turn engine off as soon crank power mode is observed.
  4. Using scan tool, select CLASS 2 POWER MODE parameter in DIAGNOSTIC CIRCUIT CHECK. Rotate ignition switch through all positions while observing IGNITION SWITCH POWER MODE parameter. If class 2 power mode parameter reading matches actual ignition switch position for all switch positions, go to next step. If class 2 power mode parameter reading does not match actual ignition switch position for all switch positions, repair voltage input to body control module as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  5. Using scan tool, select DISPLAY DTC function for DDM. Record all displayed DTCs and status of displayed DTCs. If any DTCs are displayed, go to next step. If no DTCs are displayed, repair door system by symptom as necessary. See appropriate INSTRUMENT PANELS, POWER DOOR LOCKS, POWER MIRRORS or POWER WINDOWS article.
  6. If scan tool does not display DTC U1161, U1162, or U1170, go to next step. If scan tool displays DTC U1161, U1162, or U1170, perform appropriate test. See DTC U1161: LOSS OF PASSENGER DOOR MODULE SERIAL DATA, DTC U1162: LOSS OF REAR DOOR MODULE SERIAL DATA & DTC U1170: LOSS OF DRIVER DOOR SWITCH ASSEMBLY SERIAL DATA  in DIAGNOSTIC TESTS.
  7. If scan tool does not display any other DTCs that begin with "U", go to next step. If scan tool displays any other DTCs that begin with "U", go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  8. If scan tool does not display DTC B1656, go to next step. If scan tool displays DTC B1656, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  9. If scan tool does not display DTCs B1982 or B1983, go to next step. If scan tool displays DTCs B1982 or B1983, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  10. If scan tool does not display DTCs B2240, B2241 or B2242, go to next step. If scan tool displays DTCs B2240, B2241 or B2242, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  11. If scan tool displays DTCs that begin with "P", perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display DTCs that begin with "P", perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS 
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