Toyota Corolla Cross: Starter Circuit Short to Ground (B227511,B227512)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function, Hev Model) / Starter Circuit Short to Ground (B227511,B227512)

DESCRIPTION

This DTC is stored when a malfunction is detected in the starter circuit inside the certification ECU (smart key ECU assembly).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B227511	Starter Circuit Short to Ground	Certification ECU (smart key ECU assembly) internal HV activation request output circuit malfunction or external circuit malfunction (1-trip detection logic*)	Certification ECU (smart key ECU assembly) Hybrid vehicle control ECU Wire harness or connector	DTC Output Confirmation Operation: Turn the ignition switch to ON and wait 10 seconds or more, then start the hybrid control system 3 times.
B227512	Starter Circuit Short to Battery	Certification ECU (smart key ECU assembly) internal HV activation request output circuit malfunction or external circuit malfunction (1-trip detection logic*)	Certification ECU (smart key ECU assembly) Hybrid vehicle control ECU Wire harness or connector	DTC Output Confirmation Operation: Turn the ignition switch to ON and wait 10 seconds or more, then start the hybrid control system 3 times.

*: Only detected while a malfunction is present and the ignition switch is ON.

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
The power source mode changes to ON (READY) even though the hybrid control system is not started. The power source mode does not change to ON (READY) even though the hybrid control system is started.	-

Related Data List and Active Test Items

DTC No.	Data List and Active Test
B227511 B227512	-

DTC No.

Data List and Active Test

B227511

B227512

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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Start Key(CAN). 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.
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Before replacing the hybrid vehicle control ECU or certification ECU (smart key ECU assembly), refer to Registration.
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After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.	CHECK FOR DTC

(a) Turn the ignition switch to ON and wait 25 seconds.

(b) Using the GTS, check for certification ECU (smart key ECU assembly) DTCs.

Body Electrical > Power Source Control > Trouble Codes

OK:

DTC B228562 is not output simultaneously.

GO TO DTC B228562

2.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the I223 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I249 hybrid vehicle control ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I223-2 (ST2) - I249-11 (ST2)	Always	Below 1 Ω
I223-2 (ST2) or I249-11 (ST2) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Connect the I223 certification ECU (smart key ECU assembly) connector.

(b) Connect the I249 hybrid vehicle control ECU connector.

*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

Standard Voltage:

Tester Connection	Condition	Specified Condition
I223-2 (ST2) - Body ground	With the brake pedal depressed, the power switch is pressed and held	8.5 V or higher
I223-2 (ST2) - Body ground	After approx. 3 sec. has elapsed, the power switch is released	1 V or less

REPLACE HYBRID VEHICLE CONTROL ECU

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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