Steering Lock Motor Drive Power Circuit: Procedure

1. Check the problem symptom of the steering lock system.

   Result

   Condition	Proceed to
   Steering lock cannot be released	A
   Steering cannot be locked	B

B → See step   6 

A: Go to next step 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Smart Key / Data List.
6. Select the item below in the Data List, and read its value displayed on the Techstream.
   SMART KEY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Lck/Unlck Rec	Steering lock command reception record / YES or NO	YES: Steering lock/unlock signal received NO: Steering lock/unlock signal not received	-

7. Check if a steering unlock command signal has been received.

   OK

   "YES" is displayed on the Techstream display.

NG → See step   8 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying IGE And GND Of E39 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E39-3 (IGE) - E39-1 (GND)	Engine switch off Engine switch on (ACC or IG)	Motor activated: Below 1 V Motor not activated: 11 to 14 V

NG → See step   4 

OK → See step   9 

1. Disconnect the E39 connector from the steering lock actuator assembly.
   Fig 2: Identifying GND Of E39 Connector Terminal

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E39-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E50 connector from the main body ECU.
   Fig 3: Identifying Steering Lock Actuator Assembly And Main Body ECU Connector Terminals

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E39-3 (IGE) - E50-7 (SLR+)	Always	Below 1 Ω
   E39-3 (IGE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

1. Measure the voltage according to the value(s) in the table below.
   Fig 4: Identifying IGE And GND Of E39 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E39-3 (IGE) - E39-1 (GND)	The specified condition should be checked after performing the following: Move the shift lever to neutral Turn the engine switch off Open the driver's door	Motor activated: Below 1 V Motor not activated: 11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E39 connector from the steering lock actuator assembly.
   Fig 5: Identifying Steering Lock Actuator Assembly And Main Body ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E50 connector from the main body ECU.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E39-3 (IGE) - E50-7 (SLR+)	Always	Below 1 Ω
   E39-3 (IGE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU