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PCI Bus Communication Failure

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
    NOTE: Determine which modules this vehicle is equipped with before beginning.
    CAUTION: When attempting to communicate with any of the modules on this vehicle, the DRBIII will display 1 of 2 different communication errors: a NO RESPONSE message or a BUS +/- SIGNALS OPEN message.
  1. Turn the ignition on. Using the DRBIII, attempt to communicate with the following control modules: airbag control module, SKIM (sentry key immobilizer) and MIC (instrument cluster). If the DRBIII was able to communicate with one or more modules, go to the next step. If the DRBIII was not able to communicate with one or more modules, go to step  3.
  2. Turn the ignition off. Visually inspect the related wiring harness and connectors. Look for any chafed, pierced, pinched, or partially broken wires or connectors. If the DRBIII can not communicate with a single module, refer to the symptom index for the related symptoms. See SYMPTOM INDEX  table under SELF-DIAGNOSTIC SYSTEM. If any problems were found, repair wiring harness/connectors as necessary. If no problems were found, the test is complete.
  3. Turn the ignition off. Disconnect the PCM harness connector. See Figure. Disconnect the DRBIII from the Data Link Connector (DLC). Disconnect the negative battery cable. Measure the resistance of the PCI bus circuit between the Data Link Connector (DLC) and the PCM connector. If the resistance is below 5.0 ohms, go to the next step. If the resistance is above 5.0 ohms, repair the PCI bus circuit for an open.
    4. NOTE: Reconnect the PCM harness connector and the negative battery cable.
  4. Turn the ignition on. Measure the voltage of the PCI bus circuit at the Data Link Connector (DLC). If the voltage is above 1.5 volts, go to the next step. If the voltage is below 1.5 volts, go to step  6.
    5. NOTE: When performing this step, turn ignition off and wait one minute before disconnecting each module. After each module is disconnected, turn ignition on.
  5. Turn the ignition off. Using a voltmeter, connect one end to the PCI bus circuit at the DLC, and the other end to ground. Turn the ignition on. While monitoring the voltmeter, disconnect each module the vehicle is equipped with one at a time. If the voltage is steadily above 1.5 volts with all the modules disconnected, repair the PCI bus circuit for a short to voltage. If the voltage is steadily below 1.5 volts with all the modules disconnected, replace the module that when disconnected, the short to voltage was eliminated.
  6. Turn the ignition off. Disconnect the negative battery cable. Using a ohmmeter, connect one end to the PCI bus circuit at the DLC, and the other end to ground. While monitoring the ohmmeter, disconnect each module the vehicle is equipped with one at a time. If the resistance is below 1000 ohms with all the modules disconnected, repair the PCI bus circuit for a short to ground. If the resistance is above 1000 ohms with all the modules disconnected, replace the module that when disconnected, the short to ground was eliminated.
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