DTC B2782: Power Source Control ECU Malfunction [05/2019 - ]: Procedure

1. Disconnect the I2 steering lock ECU (steering lock actuator assembly) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I2-1 (GND) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Reconnect the I2 steering lock ECU (steering lock actuator assembly) connector.
2. Move the shift lever to P and turn the engine switch off.
3. Check the signal waveform according to the condition(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Frequency

   Item	Content
   Tester Connection	I2-3 (IGE) - I2-1 (GND)
   Tool Setting	2 V/DIV., 200 ms./DIV.
   Vehicle Condition	Steering lock motor not operating → Operating → Not 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).
     • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  3

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - ]

   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 PRECAUTION [05/2019 - ]

   • When disconnecting and reconnecting the battery

     Refer to WORK PROCEDURE [05/2019 - ]

     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 [05/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

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

   Refer to DTC CHECK / CLEAR [10/2014 - ]

   Body Electrical > Smart Access > Trouble Codes 

   Result

   Result	Proceed to
   DTC B2782 is not output.	A
   DTC B2782 is output (for Manual tilt and telescopic steering column).	B
   DTC B2782 is output (for Power tilt and telescopic steering column).	C

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 [10/2014 - ] 

Result: 

C 

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY). Refer to  DISASSEMBLY [10/2014 - ] 

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
2. Disconnect the I2 steering lock ECU (steering lock actuator assembly) connector.
3. Disconnect the I53 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
   I2-3 (IGE) - I53-24 (SLR+)	Always	Below 1 Ω
   I2-3 (IGE) - Body ground	Always	10 kΩ or higher
   I53-24 (SLR+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR