MAIN BODY ECU REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed, installed, or replaced during the main body ECU (multiplex network body ECU) removal/installation are shown below.

Necessary Procedure After Parts Removed/Installed/Replaced
Replacement part or procedure Necessary procedures Effects/Inoperative when not performed Link
Disconnect cable from negative (-) battery terminal Memorize steering angle neutral point LKA/LDA system

Click here

Pre-collision system
Parking assist monitor system

Click here

Steering sensor zero point calibration Variable gear ratio steering system

Click here

Replacement of main body ECU (multiplex network body ECU) Code registration

  • Wireless door lock control system

  • Smart Access system with push-button start

  • Engine start

 See Service Bulletin for the registration method.

Tech Tips


  • Use the same procedure for RHD and LHD vehicles.

  • The procedure listed below is for LHD vehicles.

PROCEDURE


  1. PRECAUTION

    CAUTION:

    Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing.

    B000WAX

    Click here

    Note

    After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  2. REMOVE NO. 2 DECK BOARD

    Click here

  3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

    Click here

    CAUTION:

    B000Y52

    • Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Click here

    • If the airbag deploys for any reason, it may cause a serious accident.

    Note

    When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

    Click here

  4. REMOVE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

    Click here

  5. REMOVE NO. 2 AIR DUCT

    Click here

  6. REMOVE HEATER TO REGISTER CENTER SUB DUCT

    Click here

  7. REMOVE NO. 1 SIDE TRIM BRACKET

    Click here

  8. REMOVE FRONT FLOOR CARPET ASSEMBLY LH


    1. B000X6BC01
      B000WYJ Remove in this Direction

      Detach the guide and remove a part of the front floor carpet assembly LH.

  9. REMOVE NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY

    Click here

  10. REMOVE DRIVER SIDE JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU


    1. B000U6FC01
      B000XM7 Nut

      Remove the 2 nuts and disconnect the ECU.

    2. B000X00C01
      B000XM7 Nut

      Remove the 2 nuts and disconnect the driver side junction block assembly with main body ECU.

    3. B000TOVC01
      B000TT4 Connector

      Disconnect the 7 connectors.

    4. B000Z8MC01
      B000TT4 Connector

      Detach the wire harness clamp.

    5. Disconnect the 2 connectors and remove the driver side junction block assembly with main body ECU.

  11. REMOVE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. B000VO1C01
      B000XM7 Nut

      Remove the nut.

    2. Detach the claw and remove the wiring harness bracket.

    3. B000ZAKC01
      *1 Driver Side Junction Block Assembly
      *2 Main Body ECU (Multiplex Network Body ECU)

      Press the claw of the driver side junction block assembly as shown in the illustration to release the lock.

    4. B000VVLC01
      *a Protective Tape
      B000WYJ Remove in this Direction

      With the driver side junction block assembly lock released, insert a screwdriver with its tip wrapped with protective tape horizontally between the main body ECU (multiplex network body ECU) and driver side junction block assembly.

      Note


      • Use a screwdriver with a diameter between 5.0 mm (0.197 in.) and 6.3 mm (0.248 in.) and a length of approximately 90 mm (3.54 in.).

      • Do not insert the screwdriver under the connector socket of the main body ECU (multiplex network body ECU).

    5. Using the screwdriver, carefully raise the main body ECU (multiplex network body ECU) to the position where the connector becomes disconnected.

      Note


      • Do not twist the screwdriver to raise the main body ECU (multiplex network body ECU).

      • Replace the driver side junction block assembly or the main body ECU (multiplex network body ECU) when the connector terminal, locking section or case is damaged or deformed.

    6. B000UNAC01
      B000WCN Place Hand Here
      B000WYJ Remove in this Direction (1)
      B000YNM Remove in this Direction (2)

      Raise the main body ECU (multiplex network body ECU) as shown by the arrow (1), and then pull it out as shown by the arrow (2) in the illustration.

      Note


      • Do not touch the main body ECU (multiplex network body ECU) connector.

      • When removing the main body ECU (multiplex network body ECU), take care not to damage it.

      • Do not use a main body ECU (multiplex network body ECU) that has been dropped or subjected to a strong shock.