DTC B2275: STSW Monitor Malfunction [12/2019 - 11/2023]: Procedure

1. Turn the ignition switch to ON and wait 25 seconds.
2. Using the GTS, check for certification ECU (smart key ECU assembly) DTCs.

   Body Electrical > Power Source Control > Trouble Codes 

   OK

   DTC B2285 is not output simultaneously.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO DTC B2285. Refer to  DTC B2285: Steering Lock Position Signal Circuit Malfunction [12/2019 - 10/2021]  , or refer to  DTC B2285: Steering Lock Position Signal Circuit Malfunction [10/2021 - 10/2022]  , or refer to  DTC B2285: Steering Lock Position Signal Circuit Malfunction [10/2022 - 11/2023]  

Result: 

OK 

See step  2

1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the H67 hybrid vehicle control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H48-27 (ST2) - H67-4 (ST2)	Always	Below 1 Ω
   H48-27 (ST2) or H67-4 (ST2) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Connect the H48 certification ECU (smart key ECU assembly) connector.
2. Connect the H67 hybrid vehicle control ECU connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H48-27 (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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023]