MAIN BODY ECU REMOVAL

CAUTION / NOTICE / HINT

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

Necessary Procedure After Parts Removed/Installed/Replaced
Replaced Part or Performed Procedure Necessary Procedure Effect/Inoperative Function when Necessary Procedure not Performed Link
Disconnect cable from negative battery terminal Perform steering sensor zero point calibration Lane departure alert system (w/ Steering Control)

Click here

Pre-collision system
Memorize steering angle neutral point Parking assist monitor system

Click here

Main body ECU (multiplex network body ECU)*1 Perform code registration (Engine immobiliser system)

  • Wireless door lock control system

  • Smart Entry and Start System (for Entry Function)

  • Smart Entry and Start System (for Start Function)

  • Steering lock function

 See Service Bulletin for the registration method.
*1: w/ Smart Entry and Start System

PROCEDURE


  1. PRECAUTION

    CAUTION:

    Be sure to read Precaution thoroughly before servicing.

    Click here

    B0084N2

    Note

    After turning the ignition 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. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL (for LHD)

    for 2AR-FE:

    Click here

    for A25A-FKS:

    Click here

    for 2GR-FKS:

    Click here

  3. DISCHARGE DOOR CONTROL BATTERY AND DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL (w/ Door Control Battery)

    Note


    • Always ensure that the cable is disconnected from the negative (-) battery terminal and the door control battery is fully discharged when removing or installing the junction block assembly.

    • Make sure to perform the following procedure before removal and installation of the junction block assembly.

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

      Click here

    Tech Tips


    • When the engine switch is turned off after the door control battery is fully charged, the door control battery becomes completely discharged due to self-discharge within approximately 30 minutes.

    • Approximately 90 seconds after the engine switch is turned on (IG), the door control battery becomes fully charged.

    • When approximately 30 minutes or more have elapsed after the engine switch is turned off, the Active Test may not be able to be performed.


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.


      Body Electrical > Main Body > Active Test
      Tester Display Control Range
      Shock Detection Unlock ON/OFF

      Note

      Do not perform the Active Test at this time.

    5. Disconnect the cable from the negative (-) battery terminal.

    6. Perform the "Shock Detection Unlock" Active Test repeatedly until the multiplex network body ECU (main body ECU) communication lost error message "Lost communication with vehicle" is displayed on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display
      Shock Detection Unlock

      Tech Tips


      • When the cable is disconnected from the negative (-) battery terminal and the door control battery becomes completely discharged, the multiplex network body ECU (main body ECU) communication lost message "Lost communication with vehicle" is displayed on the GTS.

      • The number of times the Active Test can be performed depends on the charge condition of the door control battery.

  4. REMOVE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (for LHD)

    Click here

  5. REMOVE NO. 3 INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY (for LHD)

    Click here

  6. REMOVE FRONT DOOR SCUFF PLATE LH (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  7. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  8. DISCONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP LH (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  9. REMOVE INSTRUMENT SIDE PANEL LH (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  10. REMOVE NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY (for RHD)

    Click here

  11. REMOVE NO. 1 METER HOOD CLUSTER (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  12. REMOVE NO. 2 INSTRUMENT PANEL GARNISH SUB-ASSEMBLY (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  13. REMOVE INSTRUMENT PANEL FINISH PLATE GARNISH (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  14. REMOVE LOWER INSTRUMENT PANEL SUB-ASSEMBLY (for RHD)

    Tech Tips

    Use the same procedure for RHD and LHD.

    Click here

  15. REMOVE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU


    1. for LHD:


      1. B0083HE

        Disconnect each connector.

      2. Disengage the clamp.

      3. B0084WHC01
        B00847Z Remove in this Direction

        Disengage the 2 claws and pull down the 2 lock levers to disconnect the 2 connectors as shown in the illustration.

      4. B0089CY

        Disconnect each connector.

      5. B0084SP

        Remove the 2 nuts.

      6. B00878OC01
        B00847Z Remove in this Direction

        Disengage the claw and guide and pull out the instrument panel junction block assembly with main body ECU.

      7. B00869E

        Disengage the clamp.

      8. B0085L2

        Disengage the clamp.

      9. B008575C01
        B00847Z Remove in this Direction

        Disengage the 2 claws and pull down the 2 lock levers to disconnect the 2 connectors as shown in the illustration and remove the instrument panel junction block assembly with main body ECU.

    2. for RHD:


      1. B0088VP

        Disconnect each connector.

      2. B0084G0C01
        B00847Z Remove in this Direction

        Disengage the 2 claws and pull down the 2 lock levers to disconnect the 2 connectors as shown in the illustration.

      3. B0083NL

        Remove the 2 nuts.

      4. B0083FP

        Disengage the clamp.

      5. B0087VPC02
        B00847Z Remove in this Direction

        Disengage the claw and guide and pull out the instrument panel junction block assembly with main body ECU.

      6. B00842C

        Disengage the clamp.

      7. B0083JJ

        Disengage the clamp.

      8. B00873VC01
        B00847Z Remove in this Direction

        Disengage the 2 claws and pull down the 2 lock levers to disconnect the 2 connectors as shown in the illustration and remove the instrument panel junction block assembly with main body ECU.

  16. REMOVE WIRING HARNESS CLAMP BRACKET


    1. B0083DA

      Remove the nut.

    2. Disengage the guide to remove the wiring harness clamp bracket.

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


    1. B00881CC01
      *1 Instrument Panel Junction Block Assembly
      *2 Main Body ECU (Multiplex Network Body ECU)
      B00888T Push in this Direction

      Press the claw of the instrument panel junction block assembly as shown in the illustration to release the lock.

    2. B0084VPC01
      *a Protective Tape
      B00888T Insert in this Direction
      B00847Z Remove in this Direction

      With the instrument panel 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 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).

    3. 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).

    4. B0087CMC01
      B00847Z Remove in this Direction (1)
      B008776 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.