Inspection Procedure

1. Connect Techstream to the DLC3.
2. Check the DATA LIST for proper functioning of the steering lock function.

   HINT:

   When using Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the tester and vehicle starts.

   Main Body: 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Unlock Switch	Steering lock condition/ON or OFF	ON: Steering is unlocked (Engine switch on (ACC)) OFF Steering is locked (Engine switch off)	-

   OK: ON (steering is unlocked) and OFF (steering is locked) appear on the screen. 

NG:  Go to step  3

OK: Go to Next Step 

1. Delete the DTCs (See DTC CHECK / CLEAR  ).
2. Check for DTC B2285 (Steering lock position signal circuit malfunction) and DTC B2287 (LIN communication master malfunction) and DTC B2785 (Communication malfunction between ECUs connected by LIN).

   Result 

   RESULT CHART
   
   

   Display (DTC output)	Proceed to
   "DTC B2285" only	A
   "DTC B2287" and/or "DTC B2785"	B
   No DTC	C

   HINT:

   • If DTC B2287 is output, (See DTC B2287 LIN COMMUNICATION MASTER MALFUNCTION ).
   • If DTC B2785 is output, (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN ).

B:  GO TO DTC CHART 

C: CHECK INTERMITTENT PROBLEMS 

A: REPLACE MAIN BODY ECU 

1. Disconnect the E61, DR and E78 ECU connectors.
   Fig 1: Identifying Main Body ECU And Steering Lock 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 SPECIFIED CONDITION CHART
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   E61-18 (SLP) - E78-4 (SLP1)	Always	Below 1 Ω
   DR-9 (LIN1) - E78-5 (LIN)	Always	Below 1 Ω
   E61-18 (SLP) or E78-4 (SLP1) - Body ground	Always	10 kΩ or higher
   DR-9 (LIN1) or E78-5 (LIN) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. After replacing the main body ECU with a normally functioning ECU, check that the engine starts. Make sure the brake pedal is depressed and the shift position is P at this time.
2. Check that the engine switch mode can be changed by pushing the engine switch.

   HINT:

   Without depressing the brake pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC) to on (IG) and back to off. With the brake pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status.

   OK: Engine can start normally. 

NG: REPLACE STEERING LOCK ECU 

OK: END (MAIN BODY ECU DEFECTIVE)