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

B001CUOE01

CAUTION / NOTICE / HINT

Note


  • 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.

  • w/ Entry and Start System

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

PROCEDURE


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


    1. B001CHVC29
      *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
      A104-4 (BECU) - Body ground Always 11 to 14 V
      A104-5 (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
      A104-2 (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 - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the A104 door control battery connector.

    2. Disconnect the 2M driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A104-3 (EDOR) - 2M-22 Always Below 1 Ω
      A104-3 (EDOR) or 2M-22 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY


    1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

      Click here

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

      B001DERE01
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-31 (BECU) - 2M-22 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK DOOR CONTROL BATTERY (POWER OUTPUT)


    1. Turn the ignition switch off.

    2. Remove the ECU-B fuse from the engine room relay block.

    3. B001GSDC04
      *a

      Component with harness connected

      (Door Control Battery)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A104-3 (EDOR) - Body ground Approximately 90 seconds or more elapsed after ignition switch turned to ON (door control battery fully charged) → Approximately 30 minutes or more elapsed after ignition switch turned off (door control battery fully discharged) 11 to 14 V → Below 2 V

      Tech Tips

      Charge and discharge times differ depending on the charging amount of the door control battery.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DOOR CONTROL BATTERY for LHD: Click here for RHD: Click here

    OK

  5. CHECK DOOR CONTROL BATTERY (POWER OUTPUT)


    1. Turn the ignition switch off.

    2. 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.

    3. B001GSDC04
      *a

      Component with harness connected

      (Door Control Battery)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A104-3 (EDOR) - Body ground Ignition switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE DOOR CONTROL BATTERY for LHD: Click here for RHD: Click here