B1008

Factory Manual References

Factory service manual diagnostic procedure for 2007 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 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 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

Circuit Diagram

Fuse/Relay

DTC B1000: Communication Bus Line Error

Fuse/Relay

DTC B1001: MICU (CPU) Error

Fuse/Relay

DTC B1002: MICU (EEPROM) Error

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