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Home >> Acura >> 2007 >> RL >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Integrated Control System >> DTC Troubleshooting >> DTC B1000: Communication Bus Line Error (BUS-OFF)

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

  1. Clear the DTCs with the HDS.
  2. Turn the ignition switch OFF, and then back ON (II).
  3. Wait for 6 seconds or more.
  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 6 seconds, then recheck for DTCs after each unit is disconnected.
    CONTROL UNIT REFERENCE

    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)
    OnStar Control Unit(1) Connector A (22P)
    AcuraLink Control Unit (XM receiver) Connector B (16P)
    Adaptive Front Lighting Control Unit Connector (40P)
    Keyless Access Control Unit Connector A (31P)
    (1) '05-06 models

    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 REFERENCE

    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)
    OnStar Control Unit(1) Connector A (22P)
    AcuraLink Control Unit (XM receiver) Connector B(16P)
    Adaptive Front Lighting Control Unit Connector (40P)
    Keyless Access Control Unit Connector A (31P)
    (1) '05-06 models
  8. Disconnect driver's under-dash fuse/relay box connectors X (39P), N (45P), J (30P), 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.
    CONNECTOR TERMINALS REFERENCE

    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
    OnStar Control Unit(1) G1
    AcuraLink Control Unit (XM receiver) G1
    Adaptive Front Lighting Control Unit D11
    Keyless Access Control Unit X18
    (1) '05-06 models

    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  - Go to step 10.

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

    Is there less than 1 V? 

    YES  - Replace the driver's under-dash fuse/relay box.

    NO  - Repair the short in the wire between the driver's under-dash fuse/relay box and the affected control unit.

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