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.

1. CHECK STEERING LOCK ECU 
   1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition (Steering Lock Position)	Specified Condition
      4 (SLP1) - 2 (SGND)	Locked	11 to 14 V
      4 (SLP1) - 2 (SGND)	Unlocked	Below 1.2 V

      NG: Go to step  3

      Fig 1: Identifying Terminals Of Steering Lock ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU) 
   1. Disconnect the E77 and E15 ECU connectors.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E15-18 (SLP) - E77-4 (SLP1)	Always	Below 1 Ω
      E77-4 (SLP1) - Body ground	Always	10 kΩ or higher

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 2: Identifying Terminals Of E77 And E15 ECU Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) 
   1. Disconnect the E77 ECU connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E77-1 (GND) - Body ground	Always	Below 1 Ω
      E77-2 (SGND) - Body ground	Always	Below 1 Ω

      Fig 3: Identifying Terminals Of E77 ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step 

4. CHECK HARNESS AND CONNECTOR (BATTERY - STEERING LOCK ECU) 
   1. Disconnect the E77 ECU connector.
   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E77-7 (B) - E77-2 (SGND)	Always	11 to 14 V

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 4: Identifying Terminals Of E77 ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

5. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU) 
   1. Disconnect the E77 and E15 ECU connectors.
   2. Disconnect the E15 connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E15-18 (SLP) - E77-4 (SLP1)	Always	Below 1 Ω
      E77-4 (SLP1) - Body ground	Always	10 kΩ or higher

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 5: Identifying Terminals Of E77 And E15 ECU Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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