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 main body ECU (instrument panel junction block assembly) 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

B409277E07

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK DOOR LOCK OPERATION

    1. Check door lock operation (Click here).

      OK

      All doors lock and unlock normally.

    GO TO PROBLEM SYMPTOMS TABLE

    (Click here)

  2. CHECK DOOR CONTROL BATTERY

    1. U184666E02

      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

      H129-8 (IG) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

      (to Door Control Battery)

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] - DOOR CONTROL BATTERY)Click here

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] - DOOR CONTROL BATTERY)

    1. Disconnect the H79 main body ECU (instrument panel junction block assembly) connector.

    2. Disconnect the H129 door control battery connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H79-4 (BATB) - H129-12 (SUBB)

      Always

      Below 1 Ω

      H79-4 (BATB) or H129-12 (SUBB) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. REPLACE DOOR CONTROL BATTERY

    1. Replace the door control battery with new or known good one (Click here).

  5. CHECK DOOR CONTROL BATTERY

    1. Check door control battery operation (Click here).

      OK

      Collision detection door lock function operates normally.

    END (DOOR CONTROL BATTERY WAS DEFECTIVE)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] - DOOR CONTROL BATTERY)

    1. Disconnect the DD main body ECU (instrument panel junction block assembly) connector.

    2. Disconnect the H129 door control battery connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      DD-6 - H129-8 (IG)

      Always

      Below 1 Ω

      DD-6 or H129-8 (IG) - Body ground

      Always

      10 kΩ or higher

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    REPAIR OR REPLACE HARNESS OR CONNECTOR