DTC B2782: Power Source Control ECU Malfunction [11/2018 - 12/2021]: Procedure

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator with ECU Assembly))
   *b	Waveform
   *c	Steering Lock Motor not Operating
   *d	Steering Lock Motor Operating

   OK

   Tester Connection	Tool Setting	Condition	Specified Condition
   G56-3 (IGE) - G56-1 (GND)	2 V/DIV., 200 ms./DIV.	Any door opened when following conditions are met, and then steering lock motor activated: Shift state park (P) Steering lock unlocked in advance by carrying key and turning power switch on (IG) After above conditions are met, power switch turned off	Pulse generation (See waveform)

   HINT: 

   • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.
   • In order to take measurements when the lock motor is operating, perform either of the following operations:
     • To unlock the steering, carry the key and turn the power switch on (ACC) or on (IG).
     • To lock the steering, turn the power switch off with the shift state park (P), and then open a door.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Key / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > Smart Key > Clear DTCs 

6. Disconnect the cable from the negative (-) auxiliary battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) auxiliary battery terminal to clear the record of malfunctions stored in the Data List.
   NOTE:

   • After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notices before proceeding with work.

     Refer to PRECAUTION [11/2018 - ]

   • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

     Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Perform the DTC output confirmation operation.
2. Enter the following menus: Body Electrical / Smart Key / Trouble Codes.
3. Check if DTC B2782 is output.

   Body Electrical > Smart Key > Trouble Codes 

   Result

   Result	Proceed to
   DTC B2782 is not output.	A
   DTC B2782 is output.	B

Result: 

A 

SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR) 

Result: 

B 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY). Refer to  DISASSEMBLY [11/2018 - 12/2021] 

1. Disconnect the G56 steering lock ECU (steering lock actuator with ECU assembly) connector.
2. Disconnect the G54 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G56-3 (IGE) - G54-25 (SLR+)	Always	Below 1 Ω
   G56-1 (GND) - Body ground	Always	Below 1 Ω
   G56-3 (IGE) or G54-25 (SLR+) - Other terminals and body ground	Always	10 kΩ or higher

   NOTE:

   If the result is not as specified, check for looseness in the connection which leads to ground.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2018 - 02/2019]  , or refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR