DTC B2782: Power Source Control ECU Malfunction: Procedure

1. Disconnect the F68 steering lock ECU connector.
   Fig 1: Steering Lock ECU Connector GND Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch off, make sure that the steering lock is unlocked and move the shift lever to P.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F68-1 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

4. Reconnect the F68 steering lock ECU connector.
   Fig 2: Inspecting Steering Lock ECU (IGE Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F68-3 (IGE) - F68-1 (GND)	Driver side door opened	Below 1 V (Steering lock motor operating)
   F68-3 (IGE) - F68-1 (GND)	Driver side door opened	11 to 14 V (Steering lock motor not operating)

   HINT: 

   When the steering lock is locked and the engine is switch is turned on (IG), the steering lock motor activates to release the steering lock. The motor operates for 2 to 15 seconds.

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU)

NG → See step   4 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Disconnect and reconnect the cable to the negative (-) battery terminal to clear the malfunction history of Power Supply Open.

NEXT: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR .
2. 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 Open	Open in ECU record/NG (PAST) or OK	NG (PAST): Open in ECU OK: No malfunction	-

   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

B → See step   6 

A → See step   5 

1. Disconnect the F80 power management control ECU connector.
2. Disconnect the F68 steering lock ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F68-3 (IGE) - F80-8 (SLR+)	Always	Below 1 Ω
   F68-3 (IGE) or F80-8 (SLR+) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7