Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B2NQ
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): B2275; STSW Monitor Malfunction; 2019 - 2022 MY Avalon HV [04/2018 -        ]

DTC

B2275

STSW Monitor Malfunction

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

B2275

STSW Monitor Malfunction

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 power switch on (IG) and wait 10 seconds or more, then start the hybrid control system 3 times.
  • *: Only detected while a malfunction is present and the power switch is on (IG).

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

B2275

Power Source Control

  • Starter Request Signal

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

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

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

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

PROCEDURE

1.

CHECK FOR DTC

(a) Turn the power switch on (IG) and wait 25 seconds.

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

Body Electrical > Power Source Control > Trouble Codes

OK:

DTC B2285 is not output simultaneously.

NG

GO TO DTC B2285 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): B2285; Steering Lock Position Signal Circuit Malfunction 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): B2285; Steering Lock Position Signal Circuit Malfunction

OK

2.

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

(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the G46 hybrid vehicle control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G40-27 (ST2) - G46-9 (ST2)

Always

Below 1 Ω

G40-27 (ST2) or G46-9 (ST2) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the G40 certification ECU (smart key ECU assembly) connector.

(b) Reconnect the G46 hybrid vehicle control ECU connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G40-27 (ST2) - Body ground

With the brake pedal depressed, the power switch is pressed and held → After approx. 3 sec. has elapsed, the power switch is released

8.5 V or higher → 1 V or less
OK

REPLACE HYBRID VEHICLE CONTROL ECU 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL