PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2036

DTC Code DTC Name
B2036 Power Supply Relay Malfunction Open

DESCRIPTION

If the seat belt control ECU judges that there is a malfunction in its internal circuit as a result of self-diagnosis, or if the power source voltage (+B) is not input to the seat belt control ECU, this DTC will be stored.

DTC No. DTC Detection Condition Trouble Area
B2036

  • Malfunction in seat belt control ECU

  • Power source voltage (+B) is not input to the seat belt control ECU.

  • Harness or connector

  • PSB fuse

  • Seat belt control ECU

INSPECTION PROCEDURE

Note


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

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

PROCEDURE


  1. INSPECT SEAT BELT CONTROL ECU (+B TERMINAL VOLTAGE)

    CAUTION:

    Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.


    1. A003YX5E51
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the seat belt control ECU connector.

    3. Connect the cable to the negative (-) auxiliary battery terminal.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H6-7 (+B) - Body ground Power switch off 11 to 14 V

    5. Disconnect the cable from the negative (-) auxiliary battery terminal.

    6. Reconnect seat belt control ECU connector.

    7. Connect the cable to the negative (-) auxiliary battery terminal.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT)

    OK

    REPLACE SEAT BELT CONTROL ECU Click here