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

B006NQGE01

CAUTION / NOTICE / HINT

Note


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

  • After performing the following inspection, perform Initialization.

    Click here

PROCEDURE


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


    1. B006ODXC06
      *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
      G49-4 (BECU) - Body ground Always 11 to 14 V
      G49-5 (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
      G49-2 (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 - JUNCTION BLOCK ASSEMBLY LH)


    1. Disconnect the G49 door control battery connector.

    2. Disconnect the 4D junction block assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G49-3 (EDOR) - 4D-23 Always Below 1 Ω
      G49-3 (EDOR) or 4D-23 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT JUNCTION BLOCK ASSEMBLY LH


    1. Remove the junction block assembly LH.

      Click here

      B006QYBC01
      *a

      Component without harness connected

      (Junction Block Assembly LH)

      		 - -

    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
      MB-31 (BECU) - 4D-23 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE JUNCTION BLOCK ASSEMBLY LH 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. B006NWMC01
      *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
      G49-3 (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
      G49-3 (EDOR) - Body ground Engine switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE DOOR CONTROL BATTERY Click here