DTC B2782: Power Source Control ECU Malfunction [10/2020 - 10/2022]: 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
   G22-3 (IGE) - G22-1 (GND)	2 V/DIV., 200 ms./DIV.	Any door opened when conditions below met, and then steering lock motor activated: Shift state park (P) Steering lock unlocked in advance by carrying key and turning engine switch on (IG) After above conditions met, engine 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 engine switch on (ACC) or on (IG).
     • To lock the steering, turn the engine 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. Clear the DTCs.

   Body Electrical > Smart Access > Clear DTCs 

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

   • After the engine switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

     Refer to BEFORE DISCONNECTING BATTERY [10/2020 - 10/2022]

   • When disconnecting and reconnecting the battery.

     Refer to WORK PROCEDURE [10/2020 - 10/2022]

     HINT: 

     When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

     Refer to AUTOMATIC LEARNING CHART [10/2020 - 10/2023]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Perform the DTC output confirmation operation.
2. Check if DTC B2782 is output.

   Body Electrical > Smart Access > 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 [12/2017 - 10/2022] 

1. Disconnect the G22 steering lock ECU (steering lock actuator with ECU assembly) connector.
2. Disconnect the G71 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
   G22-3 (IGE) - G71-25 (SLR+)	Always	Below 1 Ω
   G22-1 (GND) - Body ground	Always	Below 1 Ω
   G22-3 (IGE) or G71-25 (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 [10/2020 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR