B1000

Factory Manual References

Factory service manual diagnostic procedure for 2009 acura csx

DTC B1000: Communication Bus Line Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN SYSTEM DIAGNOSIS TEST MODE A  .
  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 ) and the charging system.

  5. Check for DTCs with the HDS.

    Are DTCs B1008, B1011, and B1032 also indicated with DTC B1000? 

    YES  -Go to step 6.

    NO  -Faulty MICU; replace the under-dash fuse/relay box.

  6. Turn the ignition switch OFF.
  7. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTCs, then recheck for DTCs after each unit is disconnected.
    CONTROL UNIT SPECIFICATION

    Control Unit Appropriate Connector
    MICU Under-dash fuse/relay box connector Q (16P)
    Gauge control module (tach) 36P connector
    Immobilizer-keyless control unit 7P connector
    Climate control unit 32P connector

    Is DTC B1000 indicated with each individual unit disconnected? 

    YES  -Go to step 8.

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

  8. Disconnect the under-dash fuse/relay box connector Q(16P).
  9. Check for continuity between the under-dash fuse/ relay box connector Q(16P) No. 6 terminal and body ground.
    Fig 1: Checking Continuity Between Under-Dash Fuse/ Relay Box Connector Q(16P) 6 Terminal And Body Ground
    G06269255Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair the short to ground in the wire.

    NO  -Go to step 10.

  10. Turn the ignition switch ON (II).
  11. Check for voltage between the under-dash fuse/ relay box connector Q (16P) No. 6 terminal and body ground.
    Fig 2: Checking Voltage Between Under-Dash Fuse/ Relay Box Connector Q (16P) 6 Terminal And Body Ground
    G06269256Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there voltage? 

    YES  -Repair the short to power in the wire between the under-dash fuse/relay box connector and the affected control unit.

    NO  -Faulty MICU; replace the under-dash fuse/relay box.

DTC B1150: Communication Bus Line Error (Bus off)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN SYSTEM DIAGNOSIS TEST MODE A  .
  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.

    Are DTCs B1001, B1008, B1011, B1032, and or B1900 also indicated with DTC B1150? 

    YES  -Troubleshooting DTC B1000.

    NO  -If only DTC B1150 is present, replace the gauge control module (tach) assembly. If no DTCs are present, it's an intermittent failure, the system is OK at this time. Check for loose or poor connections at the gauge control module (tach) 36P connector, and at the under-dash fuse/relay box connector Q (16P).

DTC B1000: Communication Bus Line Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN SYSTEM DIAGNOSIS TEST MODE A  .
  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 ) and the charging system.

  5. Check for DTCs with the HDS.

    Are DTCs B1008, B1011, and B1032 also indicated with DTC B1000? 

    YES  -Go to step 6.

    NO  -Faulty MICU; replace the under-dash fuse/relay box.

  6. Turn the ignition switch OFF.
  7. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTCs, then recheck for DTCs after each unit is disconnected.
    CONTROL UNIT SPECIFICATION

    Control Unit Appropriate Connector
    MICU Under-dash fuse/relay box connector Q (16P)
    Gauge control module (tach) 36P connector
    Immobilizer-keyless control unit 7P connector
    Climate control unit 32P connector

    Is DTC B1000 indicated with each individual unit disconnected? 

    YES  -Go to step 8.

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

  8. Disconnect the under-dash fuse/relay box connector Q(16P).
  9. Check for continuity between the under-dash fuse/ relay box connector Q(16P) No. 6 terminal and body ground.
    Fig 1: Checking Continuity Between Under-Dash Fuse/ Relay Box Connector Q(16P) 6 Terminal And Body Ground
    G06269255Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair the short to ground in the wire.

    NO  -Go to step 10.

  10. Turn the ignition switch ON (II).
  11. Check for voltage between the under-dash fuse/ relay box connector Q (16P) No. 6 terminal and body ground.
    Fig 2: Checking Voltage Between Under-Dash Fuse/ Relay Box Connector Q (16P) 6 Terminal And Body Ground
    G06269256Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there voltage? 

    YES  -Repair the short to power in the wire between the under-dash fuse/relay box connector and the affected control unit.

    NO  -Faulty MICU; replace the under-dash fuse/relay box.

Supporting Diagrams & Locations

Reference material from the factory manual for this diagnostic procedure.

Diagram

Circuit Diagram

Diagram

Circuit Diagram

Diagram

Circuit Diagram

Diagram

Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN)

Diagram

Circuit Diagram

Diagram

Circuit Diagram

Location

Component Location Index

Location

Component Location Index

Location

Component Location Index

Location

Component Location Index

Fuse/Relay

DTC B1026: Front Passenger's Door Lock Switch Signal Error

Fuse/Relay

DTC B1127: Driver's Door Key Cylinder Switch Signal Error

Fuse/Relay

DTC B1128: Driver's Door Lock Switch Signal Error (LOCK/UNLOCK)

Fuse/Relay

DTC B1129: Driver's Door Lock Knob Switch Signal Error (LOCK/UNLOCK)

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