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DTC B1000: Communication Bus Line Error (BUS Off)

WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF, and then back ON (II).
  3. Check for DTCs with the HDS.

    Is DTC B1000 indicated? 

    YES  -Go to step 4.

    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.

  4. Check for DTCs with the HDS.

    Are DTCs B1005, B1006, B1007, B1008, B1010, B1011 and B1032 indicated? 

    YES  -Go to step 5.

    NO  -Replace the MICU.

  5. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.
    TERMINALS REFERENCE CHART

    Control Unit Appropriate Connector
    Gauge Control Module Connector B (18P)
    Relay Control Module Under-hood fuse/relay box connector K (10P)
    Door Multiplex Control Unit Connector A (22P)
    Combination switch Control Unit Connector (8P)
    Power Seat Control Unit Connector A (20P)
    Display Panel Control Unit Connector A (22P)
    HandsFreeLink Control Unit Connector (28P)
    Automatic Lighting Control Unit Connector (14P)
    AcuraLink Control Unit Connector C (16P)

    Is DTC B1000 indicated with each individual unit disconnected? 

    YES  -Go to step 6.

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

  6. Disconnect all of the appropriate connectors for each of the units in the table.
    TERMINALS REFERENCE CHART

    Control Unit Appropriate Connector
    Gauge Control Module Connector B (18P)
    Relay Control Module Under-hood fuse/relay box connector K (10P)
    Door Multiplex Control Unit Connector A (22P)
    Combination Switch Control Unit Connector (8P)
    Power Seat Control Unit Connector A (20P)
    Display Panel Control Unit Connector A (22P)
    HandsFreeLink Control Unit Connector (28P)
    Automatic Lighting Control Unit Connector (14P)
    AcuraLink Control Unit Connector C (16P)
  7. Disconnect under-dash fuse/relay box connectors X (39P), N (45P), J (30P), G (8P), D (17P).
  8. Check for continuity between each of the under-dash fuse/relay box terminals listed in the table below and body ground.
    TERMINALS REFERENCE CHART

    Connected Control Unit Under-dash fuse/relay box terminal
    Gauge Control Module N28
    Relay Control Module D11
    Door Multiplex Control Unit J4
    • Combination Switch Control Unit
    • Automatic Lighting Control Unit
    		 X27
    • Power Seat Control Unit
    • AcuraLink Control Unit
    		 G1
    Display Panel Control Unit N22
    HandsFreeLink Control Unit X18

    Is there continuity? 

    YES  -Repair a short in the wire between the under-dash fuse/relay box and the connected control unit.

    NO  -Go to step 9.

  9. Measure the voltage between each of the under-dash fuse/relay box terminals listed in the table above and body ground.

    Is there 1 V or less? 

    YES  -Replace the under-dash fuse/relay box.

    NO  -Repair a short in the wire between the under-dash fuse/relay box and the connected control unit.

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