POWER DOOR LOCK CONTROL SYSTEM Power Source Circuit

DESCRIPTION

The main power source for the main body ECU (multiplex network body ECU) is supplied via the door control battery.

WIRING DIAGRAM

A01HEOVE02

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (DOOR CONTROL BATTERY - BATTERY AND BODY GROUND)


    1. A01HFFGC04
      *a

      Front view of wire harness connector

      (to Door Control Battery)

      Disconnect the door control battery connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I63-4 (BECU) - Body ground Always 11 to 14 V
      I63-5 (BATB) - Body ground Always 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I63-2 (GND1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (DOOR CONTROL BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the I63 door control battery connector.

    2. Disconnect the 4D instrument panel junction block assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I63-3 (EDOR) - 4D-49 Always Below 1 Ω
      I63-3 (EDOR) or 4D-49 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.


      B008IE0C04
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-31 (BECU) - 4D-49 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here for RHD: Click here

    OK

  4. INSPECT DOOR CONTROL BATTERY (POWER OUTPUT)


    1. Turn the engine switch off.

    2. Remove the ECU-B NO. 1 fuse from the engine room relay block. and leave the vehicle as is for 50 minutes.

    3. Leave the vehicle as is for 30 minutes (wait until the door control battery is discharged).

      Tech Tips

      Discharge time is reduced when the door control battery is not fully charged.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I63-3 (EDOR) - Body ground Engine switch off Below 2 V

    5. Install the ECU-B NO.1 fuse to the engine room relay block.

    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I63-3 (EDOR) - Body ground Engine switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here for RHD: Click here

    NG

    REPLACE DOOR CONTROL BATTERY Click here