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Not Receiving BUS Messages Correctly

  1. Turn ignition switch to OFF position. Disconnect Powertrain Control Module (PCM) harness connector C3. See COMPONENT LOCATIONS  . Connect scan tool to Data Link Connector (DLC). See Figure . Turn ignition switch to ON position. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool display BUS OPERATIONAL, replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS OPERATIONAL, go to next step.
    2. WARNING: DO NOT reconnect battery before turning ignition switch to ON position and ensuring no one is in vehicle. Air bag may deploy.
    NOTE: Disconnect battery and wait 2 minutes before disconnecting Air Bag Control Module (ACM). If ACM is dropped, it must be replaced.
  2. Turn ignition switch to OFF position. Disconnect negative battery cable and wait 2 minutes. Disconnect Air Bag Control Module (ACM) harness connector. Connect negative battery cable. Turn ignition switch to ON position. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool displays BUS OPERATIONAL, replace ACM. See AIR BAG CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS OPERATIONAL, go to next step.
  3. Turn ignition switch to OFF position. Disconnect Sentry Keyless Immobilizer Module (SKIM) harness connector. See Figure . Turn ignition switch to ON position. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool display BUS OPERATIONAL, replace SKIM. See SENTRY KEY IMMOBILIZER MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS OPERATIONAL, go to next step.
  4. Turn ignition switch to OFF position. Disconnect Remote Keyless Entry (RKE) module harness connector, if equipped. Turn ignition switch to ON position. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool display BUS OPERATIONAL, replace RKE module. See REMOTE KEYLESS ENTRY MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS OPERATIONAL, go to next step.
  5. Turn ignition switch to OFF position. Disconnect Compass/Mini-Trip Computer (CMTC) harness connector, if equipped. See Figure . Turn ignition switch to ON position. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool displays BUS OPERATIONAL, replace CMTC. See COMPASS/MINI-TRIP COMPUTER  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS OPERATIONAL, go to next step.
  6. Turn ignition switch to OFF position. Disconnect Transmission Control Module (TCM) harness connector, if equipped. See Figure . Turn ignition switch to ON position. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool displays BUS OPERATIONAL, replace TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display BUS OPERATIONAL, go to next step.
  7. Connect a known-good scan tool or communication cable to DLC. Using scan tool, enter SYSTEM MONITORS then CCD BUS TEST. If scan tool still displays NOT RECEIVING BUS MESSAGES CORRECTLY, replace instrument cluster. See INSTRUMENT PANELS - CHEROKEE article. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool does not display NOT RECEIVING BUS MESSAGES CORRECTLY, repair or replace scan tool or scan tool cable as necessary. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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