DTC B2782: Power Source Control ECU Malfunction: Procedure

CHECK FOR DTC OUTPUT (B2785)
1. Check for DTCs.Refer to DTC CHECK / CLEAR .
  OK
  
  DTC B2782 is output, but DTC B2785 is not output.
NG → See step 5

OK: Go to next step

INSPECT STEERING LOCK ECU

Fig 1: Identifying Steering Lock ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

Tester Connection	Condition	Specified Condition
3 (IGE) - 1 (GND)	Engine switch on (IG) Steering lock motor is operating	Below 1 V
3 (IGE) - 1 (GND)	Engine switch on (IG) Steering lock motor is not operating	11 to 14 V

HINT:

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

NG → See step 4

OK → See step 3

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU). Refer to REMOVAL

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU AND BODY GROUND)

Fig 2: Identifying E77 And E15 Connector Terminals

Disconnect the E77 and E15 ECU connectors.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E77-3 (IGE) - E15-7 (SLR+)	Always	Below 1 Ω
E77-1 (GND) - Body ground	Always	Below 1 Ω
E77-3 (IGE) or E15-7 (SLR+) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

REFER TO B2785. Refer to DTC B2785: Communication Malfunction between ECUs Connected by LIN