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. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn Techstream on.
4. Read the DATA LIST. Enter the following menus: Body/Smart Access/Data List.
   SMART ACCESS:
   
   

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

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

   OK

   "YES" is displayed on the tester display.

NG → CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Steering Lock Actuator Assembly Connector Terminal E78

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   E78-3 (IGE) - E78-1 (GND)	Engine switch off Engine switch on (ACC or IG)	Motor activated: Below 1 V Motor not activated: 10 to 12 V

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

NG: Go to next step 

1. Disconnect the E78 connector from the steering lock actuator assembly.
   Fig 2: Identifying Steering Lock Actuator Assembly Connector Terminal E78

   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
   E78-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E61 connector from the main body ECU.
   Fig 3: Identifying E78 Steering Lock Actuator Assembly And E61 Main Body 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	Condition	Specified Condition
   E78-3 (IGE) - E61-19 (SLR+)	Always	Below 1 Ω
   E78-3 (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 Steering Lock Actuator Assembly Connector Terminal E78

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   E78-3 (IGE) - E78-1 (GND)	The specified condition should be checked after performing the following: Move the shift lever to the P position Turn the engine switch off Open the driver's door	Motor activated: Below 1 V Motor not activated: 10 to 12 V

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

NG: Go to next step 

1. Disconnect the E78 connector from the steering lock actuator assembly.
   Fig 5: Identifying E78 Steering Lock Actuator Assembly And E61 Main Body ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E61 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
   E78-3 (IGE) - E61-19 (SLR+)	Always	Below 1 Ω
   E78-3 (IGE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU