Inspection Procedure

HINT:

When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:

With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

CHECK FOR DTC OUTPUT (B2785)
1. Check for DTCs (See DTC CHECK/CLEAR ).
  OK: DTC B2782 is output, but DTC B2785 is not output.
  
  NG: REFER TO B2785 (See )
  
  OK: Go to next step

INSPECT STEERING LOCK ECU

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

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.

Fig 1: Identifying Terminals Of E77 Steering Lock ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 3

OK: REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (See REMOVAL )

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

Fig 2: Identifying Terminals Of E77 And E15 ECU Connector

Disconnect the E77 and E15 ECU connectors.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

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)