DTC B2782: Power Source Control ECU Malfunction [08/2015 - ]: Procedure

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the E26 steering lock ECU (steering lock actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E26-1 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Reconnect the E26 steering lock ECU (steering lock actuator assembly) connector.
2. Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P.
3. Check the signal waveform according to the condition(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   STANDARD FREQUENCY
   
   

   Item	Content
   Tester Connection	E26-3 (IGE) - E26-1 (GND)
   Tool Setting	2 V/DIV., 200 ms./DIV.
   Vehicle Condition	Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))
   *b	Steering lock motor not operating
   *c	Steering lock motor operating

   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) with the shift lever in P.
     • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

Result: 

NG 

See step  5

Result: 

OK 

See step  3

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - ] ).
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 turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notices before proceeding with work (Refer to PRECAUTION [08/2015 - ] ).

Result: 

NEXT 

See step  4

1. Perform the DTC output confirmation operation.
2. Check if DTC B2782 is output (Refer to DTC CHECK / CLEAR [08/2015 - ] ).

   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 ASSEMBLY) 

(Refer to DISASSEMBLY [08/2015 - ] )

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
2. Disconnect the E26 steering lock ECU (steering lock actuator assembly) connector.
3. Disconnect the E125 certification ECU (smart key ECU assembly) connector.
4. Check for deformation and corrosion of the connector case and terminals.

   OK

   There is no deformation or corrosion of the connector case or terminals.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E26-3 (IGE) - E125-24 (SLR+)	Always	Below 1 Ω
   E26-3 (IGE) - Body ground	Always	10 kΩ or higher
   E125-24 (SLR+) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR