B1129

Factory Manual References

Factory service manual diagnostic procedure for 2009 acura csx

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

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - 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. Operate the driver's door lock knob switch several times.
  4. Check for DTCs with the HDS.

    Is DTC B1129 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure. The driver's door lock knob switch system is OK at this time.

  5. Select KEYLESS from the BODY ELECTRICAL menu, and enter the DATA LIST.
  6. Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK).

    Does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator ON and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator OFF with the driver's door lock knob switch in LOCK position, and does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator OFF and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator ON with the driver's door lock knob switch in UNLOCK position? 

    YES  -Faulty MICU, replace the under-dash fuse/relay box.

    NO  -Go to step 7.

  7. Disconnect the driver's door lock actuator 10P connector.
  8. Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.

    Are both information indicators OFF? 

    YES  -Check for an open in the driver's door lock knob switch (LOCK) wire or the driver's door lock knob switch (UNLOCK) wire between the MICU and the driver's door lock knob switch. If OK, replace the driver's door lock actuator.

    NO  -Go to step 9.

  9. Turn the ignition switch OFF.
  10. Disconnect the under-dash fuse/relay box connector T (34P).
  11. Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P) and body ground.
    Fig 1: Checking Continuity Between 23 (UNLOCK) And 24 (LOCK) Terminals Of Under-Dash Fuse/Relay Box Connector T (34P) And Body Ground
    G06269272Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the LOCK or UNLOCK wire.

    NO  -Go to step 12.

  12. Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P).
    Fig 2: Checking Continuity Between 23 (UNLOCK) And 24 (LOCK) Terminals Of Under-Dash Fuse/Relay Box Connector T (34P)
    G06269273Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the LOCK wire and UNLOCK wire.

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

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

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - 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. Operate the driver's door lock knob switch several times.
  4. Check for DTCs with the HDS.

    Is DTC B1129 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure. The driver's door lock knob switch system is OK at this time.

  5. Select KEYLESS from the BODY ELECTRICAL menu, and enter the DATA LIST.
  6. Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK).

    Does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator ON and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator OFF with the driver's door lock knob switch in LOCK position, and does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator OFF and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator ON with the driver's door lock knob switch in UNLOCK position? 

    YES  -Faulty MICU, replace the under-dash fuse/relay box.

    NO  -Go to step 7.

  7. Disconnect the driver's door lock actuator 10P connector.
  8. Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.

    Are both information indicators OFF? 

    YES  -Check for an open in the driver's door lock knob switch (LOCK) wire or the driver's door lock knob switch (UNLOCK) wire between the MICU and the driver's door lock knob switch. If OK, replace the driver's door lock actuator.

    NO  -Go to step 9.

  9. Turn the ignition switch OFF.
  10. Disconnect the under-dash fuse/relay box connector T (34P).
  11. Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P) and body ground.
    Fig 1: Checking Continuity Between 23 (UNLOCK) And 24 (LOCK) Terminals Of Under-Dash Fuse/Relay Box Connector T (34P) And Body Ground
    G06269272Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the LOCK or UNLOCK wire.

    NO  -Go to step 12.

  12. Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P).
    Fig 2: Checking Continuity Between 23 (UNLOCK) And 24 (LOCK) Terminals Of Under-Dash Fuse/Relay Box Connector T (34P)
    G06269273Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the LOCK wire and UNLOCK wire.

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

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

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - 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. Operate the driver's door lock knob switch several times.
  4. Check for DTCs with the HDS.

    Is DTC B1129 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure. The driver's door lock knob switch system is OK at this time.

  5. Select KEYLESS from the BODY ELECTRICAL menu, and enter the DATA LIST.
  6. Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK).

    Does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator ON and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator OFF with the driver's door lock knob switch in LOCK position, and does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator OFF and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator ON with the driver's door lock knob switch in UNLOCK position? 

    YES  -Faulty MICU, replace the under-dash fuse/relay box.

    NO  -Go to step 7.

  7. Disconnect the driver's door lock actuator 10P connector.
  8. Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) in the DATA LIST.

    Are both information indicators OFF? 

    YES  -Check for an open in the driver's door lock knob switch (LOCK) wire or the driver's door lock knob switch (UNLOCK) wire between the MICU and the driver's door lock knob switch. If OK, replace the driver's door lock actuator.

    NO  -Go to step 9.

  9. Turn the ignition switch OFF.
  10. Disconnect the under-dash fuse/relay box connector T (34P).
  11. Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P) and body ground.
    Fig 1: Checking Continuity Between 23 (UNLOCK) And 24 (LOCK) Terminals Of Under-Dash Fuse/Relay Box Connector T (34P) And Body Ground
    G06269272Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the LOCK or UNLOCK wire.

    NO  -Go to step 12.

  12. Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P).
    Fig 2: Checking Continuity Between 23 (UNLOCK) And 24 (LOCK) Terminals Of Under-Dash Fuse/Relay Box Connector T (34P)
    G06269273Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short in the wire between the LOCK wire and UNLOCK wire.

    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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