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Not Receiving BUS Messages Correctly

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM). See COMPONENT LOCATIONS  . Turn ignition on. Use scan tool to check condition of BUS. If scan tool does not display BUS OPERATIONAL, go to next step. If scan tool displays BUS OPERATIONAL, replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  2. Turn ignition off. Disconnect Transmission Control Module (TCM), if equipped. See Figure . Turn ignition on. If scan tool does not display BUS OPERATIONAL, go to next step. If scan tool displays BUS OPERATIONAL, replace TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  3. Turn ignition off. Disconnect Compass/Mini-Trip Computer (CMTC), if equipped. Turn ignition on. If scan tool does not display BUS OPERATIONAL, go to next step. If scan tool displays BUS OPERATIONAL, replace CMTC. See OVERHEAD CONSOLE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  4. Turn ignition off. Disconnect Remote Keyless Entry (RKE) module (if equipped). Turn ignition on. If scan tool does not display BUS OPERATIONAL, go to next step. If scan tool displays BUS OPERATIONAL, replace RKE module. See REMOTE KEYLESS ENTRY MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
    WARNING: Disconnect battery and wait 2 minutes before disconnecting air bag control module. If air bag control module is dropped, it must be replaced.
  5. Turn ignition off and wait 2 minutes. Disconnect Air Bag Control Module (ACM). Turn ignition on. If scan tool does not display BUS OPERATIONAL, go to next step. If scan tool displays BUS OPERATIONAL, replace ACM. See AIR BAG CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  6. Connect a known-good scan tool or communication cable to DLC. If scan tool does not display BUS OPERATIONAL, replace scan tool communications cable or scan tool as necessary. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool displays BUS OPERATIONAL, replace instrument cluster. See appropriate INSTRUMENT PANELS article. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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