Toyota Yaris: Smart Key System (for Start Function) / IG Circuit Short to Ground (B227111)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / IG Circuit Short to Ground (B227111)

DESCRIPTION

This DTC is stored when a malfunction in the IG circuit or IG hold circuit of the certification ECU (smart key ECU assembly) is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B227111

IG Circuit Short to Ground

When either of the following conditions is met (1-trip detection logic*1):

  • The IG circuit of the certification ECU (smart key ECU assembly) is malfunctioning.*2
  • The IG hold circuit of the certification ECU (smart key ECU assembly) is malfunctioning.*3
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
  • Turn the ignition switch to ON.
  • *1: Only detected while a malfunction is present and the ignition switch is ON.
  • *2: The IG circuit and IG hold circuit activate the IG relay.
  • *3: After the IG circuit turns on, even if the certification ECU (smart key ECU assembly) malfunctions, the IG hold circuit will maintain the power source mode in ON.
Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

The ignition switch cannot be turned to ON (the engine cannot be started).

The power source mode cannot be changed to ON.

Related Data List and Active Test Items

DTC No.

Data List and Active Test

B227111

Power Source Control
  • IGP Relay Monitor (Outside)
  • IGR Relay Monitor (Outside)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Click here

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

H45-11 (IGRD) - Body ground

Ignition switch ACC

1 V or less

H45-11 (IGRD) - Body ground

Ignition switch ON

9 V or higher

H45-24 (IGPD) - Body ground

Ignition switch ACC

1 V or less

H45-24 (IGPD) - Body ground

Ignition switch ON

9 V or higher

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

OK

END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    Diagnostic Trouble Code Chart

    D..

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