POWER DOOR LOCK CONTROL SYSTEM Collision Door Lock Release Function does not Operate

DTC Code DTC Name
Collision Door Lock Release Function does not Operate

DESCRIPTION

When an impact is detected, a relay inside the door control battery is operated to switch the power source of the door lock with motor assemblies from the vehicle battery to the door control battery.

WIRING DIAGRAM

B439336E01

CAUTION / NOTICE / HINT

Note:

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

  • 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

PROCEDURE

  1. CHECK DOOR LOCK OPERATION

    1. Check door lock operation.

      Click hereClick here

      OK

      All doors lock and unlock normally.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO PROBLEM SYMPTOMS TABLE

    Click hereClick here

    OK

  2. CHECK DOOR CONTROL BATTERY (BATTERY VOLTAGE)

    1. B377768C22

      *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

      Switch Condition

      Specified Condition

      N37-8 (IG) - Body ground

      Engine switch on (IG)

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - DOOR CONTROL BATTERY)Click here

    OK

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

    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the N37 door control battery connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3B-52 (ACTG) - N37-9 (ACTG)

      Always

      Below 1 Ω

      3B-52 (ACTG) or N37-9 (ACTG) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    1. Remove the instrument panel junction block assembly.

      for LHD:Click here

      for RHD:Click here

    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.

      B439338C01

      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      -

      -

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A-7 (ACTG) - 3B-52

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

  5. REPLACE DOOR CONTROL BATTERY

    1. Replace the door control battery with a new or known good one.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK DOOR CONTROL BATTERY

    1. Check door control battery operation.

      Click here

      OK

      Collision detection door lock function operates normally.

    Result

    Proceed to

    OK

    NG
    OK

    END (DOOR CONTROL BATTERY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the N37 door control battery connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3B-50 - N37-8 (IG)

      Always

      Below 1 Ω

      3B-50 or N37-8 (IG) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BATTERY VOLTAGE)

    1. B439339C01

      *a

      Component with harness connected

      (Instrument Panel Junction Block Assembly)

      Disconnect the instrument panel junction block assembly.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      3B-50 - Body ground

      Engine switch on (IG)

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    NG

    GO TO LIGHTING SYSTEM (IG Signal Circuit)

    Click here