Inspection Procedure

1. CHECK FOR DTCS 
   1. Delete the DTCs (See DTC CHECK / CLEAR  ).
   2. After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).
   3. Check for DTCs again.

      OK: DTC B2785 (Communication malfunction between ECUs connected by LIN), DTC B2287 (LIN communication master malfunction) and DTC B2781 (Open/short in steering lock ECU) are not output. 

      HINT:

      • If DTC B2785 is output, (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN ).
      • If DTC B2287 is output, (See DTC B2287 LIN Communication Master Malfunction  ).
      • If DTC B2281 is output, (See DTC B2781 OPEN / SHORT IN STEERING LOCK ECU ).

   NG: GO TO DTC CHART 

   OK: Go to Next Step 

2. CHECK WIRE HARNESS (MAIN BODY ECU - STEERING LOCK ECU) 
   1. Disconnect the E61 and E78 ECU connectors.
      Fig 1: Disconnecting E78 Steering Lock ECU Connector

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

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      E61-18 (SLP) - E78-4 (SLP1)	Always	Below 1 Ω
      E61-18 (SLP) or E78-4 (SLP1) - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

3. CHECK MAIN BODY ECU OPERATION 

1. After replacing the main body ECU with a normally functioning ECU, check that the engine starts.

OK: Steering lock/unlock function operates normally. 

HINT:

If steering lock/unlock function does not operate, refer to PROBLEM SYMPTOMS TABLE  of the electrical steering lock (steering wheel cannot be unlocked) (See PROBLEM SYMPTOMS TABLE ).

NG:  GO TO ELECTRIC STEERING LOCK

OK: END (MAIN BODY ECU DEFECTIVE)