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Remote Keyless Entry System Diagnostic System Check

NOTE: Remote Control Door Lock Receiver (RCDLR) module may as be referred to as Remote Function Actuator (RFA) module.
  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. Try to establish scan tool communication with Driver Door Module (DDM) and Remote Control Door Lock Receiver (RCDLR) module. If communication is established, go to next step. If communication is not established, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
    3. NOTE: The engine may start during the following step. Turn engine off as soon as you have observed the Crank power mode.
  3. Access the Class 2 Power Mode in the diagnostic circuit check on the scan tool. Rotate ignition switch through all positions while observing the ignition switch power mode parameter. If ignition switch parameter readings match ignition switch position for all switch positions, go to next step. If ignition switch parameter readings do not match ignition switch position for all switch positions, repair voltage input to body control module as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  4. 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 remote keyless entry system by symptom. See REMOTE KEYLESS ENTRY SYSTEMS - PARK AVENUE article.
  5. 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.
  6. 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.
  7. If scan tool does not display DTC B1000, B1652, B1656, or B1658, go to next step. If scan tool displays DTC B1000, B1652, B1656, or B1658, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  8. If scan tool displays DTC B1982 or B1983, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display DTC B1982 or B1983, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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