SMART ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2272

DTC Code DTC Name
B2272 Ignition 1 Monitor Malfunction

DESCRIPTION

This DTC is stored when there is a problem in the IG1 output circuit. The IG1 circuit is the circuit that goes from inside the main body ECU to the RH-IG1, LH-IG1 or LH-IG2 relay.

Tech Tips

When the main body ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No. DTC Detection Condition Trouble Area
B2272 The IG1 relay actuation circuit inside the main body ECU or other related circuit is malfunctioning.

  • Driver side junction block assembly (for RHD)

  • Passenger side junction block assembly (for LHD)

  • Main body ECU

  • Wire harness or connector

WIRING DIAGRAM

A01CEYGE03

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menu: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy switches repeatedly at 1.5 second intervals or less until communication between the intelligent tester and vehicle starts.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG1 Relay Monitor (Outside) Status of IG1 relay monitor (outer) / ON or OFF

      ON: Engine switch on (IG) (IG1 relay is on)

      OFF: Engine switch off (IG1 relay is off)

      		 -
      OK
      ON (engine switch on (IG)) appears on the screen.

    NG

    CHECK JUNCTION BLOCK ASSEMBLY (RH-IG RELAY) Click here

    OK

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch on (IG).

    3. After 10 seconds have elapsed, recheck for DTCs and check if the same DTC is output.

      OK
      DTC B2272 is not output.

    NG

    REPLACE MAIN BODY ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK JUNCTION BLOCK ASSEMBLY (RH-IG RELAY)


    1. A01CCROE20

      Disconnect the 5D and 5A connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5D-7 - 5A-4 Always 130 to 235 Ω at 20°C (68°F)
      5D-7 - 5D-12 Always Below 1 Ω
      5D-7 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for RHD) B
      NG (for LHD) C

    B

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

    C

    REPLACE PASSENGER SIDE JUNCTION BLOCK ASSEMBLY

    A

  4. CHECK MAIN BODY ECU (LH-IG RELAY)


    1. A01CCROE19

      Disconnect the 4D and 4A connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4D-11 - 4A-5 Always 130 to 235 Ω at 20°C (68°F)
      4D-11 - Body ground Always 10 kΩ or higher

    NG

    REPLACE MAIN BODY ECU Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - JUNCTION BLOCK)


    1. Disconnect the G48 connector.

      A01CARYE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G48-3 (IG1D) - 5D-7 Always Below 1 Ω
      G48-3 (IG1D) - Body ground Always 10 kΩ or higher
      5D-12 - 4D-11 Always Below 1 Ω
      5D-12 - Body ground Always 10 kΩ or higher
      5A-4 - Body ground Always Below 1 Ω
      4A-5 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PASSENGER SIDE JUNCTION BLOCK - DRIVER SIDE JUNCTION BLOCK)

    OK

    REPLACE MAIN BODY ECU Click here