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DTC B1000: Communication Bus Line Error (BUS-OFF)

  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch to LOCK (0) and then back to ON (II).
  3. Wait for at least 6 seconds.
  4. Check for DTCs with the HDS.

    Is DTC B1000 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the communication bus line is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system.

  5. Check for DTCs with the HDS.

    Are DTCs B1005, B1007, B1008, B1011, B1013, B1014, B1015, and B1016 also indicated? 

    YES  -Go to step 6.

    NO  -Replace the MICU.

  6. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC and wait for at least 6 seconds, then recheck for DTCs after each unit is disconnected.
    ITEM SPECIFICATION

    Control Unit Appropriate Connector
    Gauge Control Module Connector B (28P)
    Relay Control Module Connector J (10P)
    Driver's MPCS Unit Connector A (40P)
    Combination Switch Control Unit Connector (8P)
    Power Seat Control Unit Connector A (40P)
    Climate Control Unit Connector (40P)
    HandsFreeLink Control Unit Connector (22P)
    AcuraLink Control Unit (XM receiver) Connector B(16P)
    Adaptive Front Lighting Control Unit Connector (40P)
    Keyless Access Control Unit Connector A (31P)

    Is DTC B1000 indicated with each individual unit disconnected? 

    YES  -Go to step 7.

    NO  -Replace the control unit that was disconnected and B1000 did not reset.

  7. Disconnect all of the appropriate connectors for each of the units in the table.
    CONTROL UNIT POSITION CHART

    Control Unit Appropriate Connector
    Gauge Control Module Connector B (28P)
    Relay Control Module Connector J (10P)
    Driver's MPCS Unit Connector A (40P)
    Combination Switch Control Unit Connector (8P)
    Power Seat Control Unit Connector A (40P)
    Climate Control Unit Connector (40P)
    HandsFreeLink Control Unit Connector (22P)
    AcuraLink Control Unit (XM receiver) Connector B(16P)
    Adaptive Front Lighting Control Unit Connector (40P)
    Keyless Access Control Unit Connector A (31P)
  8. Disconnect driver's under-dash fuse/relay box connectors X (39P), IM (45P), J OOP), G (8P), D (17P), and T (6P).
  9. Check for continuity between each of the driver's under-dash fuse/relay box terminals listed in the table below and body ground.
    CONTROL UNIT CHART

    Connected Control Unit Driver's under-dash fuse/relay box terminal
    Gauge Control Module N22
    Relay Control Module D11
    Driver's MPCS Unit J4
    Combination Switch Control Unit N28
    Power Seat Control Unit G1
    Climate Control Unit T3
    HandsFreeLink Control Unit X27
    AcuraLink Control Unit (XM receiver) J4
    Adaptive Front Lighting Control Unit D11
    Keyless Access Control Unit X18

    Is there continuity? 

    YES  -Repair the short in the wire between the driver's under-dash fuse/relay box and the affected control unit.

    NO  -Replace the driver's under-dash fuse/relay box.

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