DTC B2782: Power Source Control ECU Malfunction: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Steering Lock Actuator Assembly Connector Terminal E78

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   E78-3 (IGE) - E78-1 (GND)	The specified condition should be checked after performing the following: Turn the engine switch off Turn the engine switch on (ACC or IG)	Motor activated: Below 1 V Motor not activated: 10 to 12 V
   E78-3 (IGE) - E78-1 (GND)	The specified condition should be checked after performing the following: Move the shift lever to the P position Turn the engine switch off Open the driver's door	Motor activated: Below 1 V Motor not activated: 10 to 12 V

   HINT: 

   The steering lock ECU and steering lock actuator assembly are supplied as a unit.

OK → REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) 

NG: Go to next step 

1. Disconnect the E78 connector from the steering lock actuator assembly.
   Fig 2: Identifying Steering Lock Actuator Assembly Connector Terminal E78

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E78-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E61 connector from the main body ECU.
   Fig 3: Identifying E78 Steering Lock Actuator Assembly And E61 Main Body ECU Connectors

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E78-3 (IGE) - E61-19 (SLR+)	Always	Below 1 Ω
   E78-3 (IGE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU