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 lock cannot be locked	B

B → See step   5 

A: Go to next step 

1. Use the Data List to check if the steering lock command is functioning properly.
   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	-

   OK

   YES is displayed on the Techstream screen.

NG → See step   8 

OK: Go to next step 

Fig 1: Steering Lock ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Immediately after turning the power switch ON (IG), measure the voltage between terminals 3 (IGE) and 1 (GND) of the steering lock ECU.
   RESULT
   
   

   Result	Proceed to
   11 to 14 V (measured voltage never becomes below 1 V)	A
   Below 1 V	B

B → See step   9 

A: Go to next step 

Fig 2: Checking Harness And Connector (Steering Lock ECU - Main Body ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L33 steering lock ECU connector.
2. Disconnect the L13 main body ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L33-3 (IGE) - L13-19 (SLR+)	Always	Below 1 Ω
   L33-3 (IGE) or L13-19 (SLR+) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

Fig 3: Steering Lock ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Shift the shift lever to the P position.
2. Turn the power switch OFF.
3. Open the driver side door.
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   3 (IGE) - 1 (GND)	Steering lock motor is operating	Below 1 V
   3 (IGE) - 1 (GND)	Steering lock motor is not operating	11 to 14 V

NG → See step   7 

OK → See step   6 

Fig 4: Checking Harness And Connector (Steering Lock ECU - Main Body ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L33 steering lock ECU connector.
2. Disconnect the L13 main body ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L33-3 (IGE) - L13-19 (SLR+)	Always	Below 1 Ω
   L33-3 (IGE) or L13-19 (SLR+) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU