DTC B2782: Power Source Control ECU Malfunction [03/2017 - ]: Procedure

1. Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D59-1 (GND) - Body ground	Always	Below 1 Ω

3. Reconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
4. Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P*.
   • *: for Automatic Transmission
5. 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	D59-3 (SLR+) - D59-1 (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 Actuator Assembly (Steering Lock ECU))
   *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).
     • To lock the steering, turn the engine switch off with the shift lever is in P*, and then open a door.
       • *: for Automatic Transmission

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - ]

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.
   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 [06/2016 - ]

Result: 

NEXT 

See step  3

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

   Refer to DTC CHECK / CLEAR [03/2017 - ]

3. Use the Data List to check if the steering lock control is functioning properly.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Power Supply Short	Record of malfunction of signal sent to steering lock actuator assembly (motor) from certification ECU (smart key ECU assembly) (short circuit) / OK or NG (Past)	OK: No record of malfunction (short circuit) NG (Past): Record of malfunction (short circuit) exists	This item records malfunctions in the circuit between the certification ECU (smart key ECU assembly) and steering lock actuator assembly (motor).

   RESULT
   
   

   Result	Proceed to
   B2782 is not output "OK" is displayed on the Techstream.	A
   B2782 is output "NG (Past)" is displayed on the Techstream.	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 ACTUATOR ASSEMBLY (STEERING LOCK ECU). Refer to  DISASSEMBLY [03/2017 - ] 

1. Disconnect the D41 certification ECU (smart key ECU assembly) connector.
2. Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
3. Check for deformation and corrosion of the connector case and terminals.

   OK

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D41-29 (SLR+) - D59-3 (SLR+)	Always	Below 1 Ω
   D59-3 (SLR+) - Body ground	Always	10 kΩ or higher
   D41-29 (SLR+) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR