Steering Lock Motor Drive Power Circuit: Procedure

1. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC output does not occur.

NG → See step   10 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Select the item "Lock/Unlock Receive" in the Data List within 10 seconds of starting the EV system and read the value displayed on the Techstream.
   SMART KEY
   
   

   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   5 

OK: Go to next step 

Fig 1: Steering Lock ECU Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the resistance and voltage according to the value(s) in the table below.

   Standard Resistance

   Standard Voltage 

   Tester Connection	Condition	Specified Condition
   E77-1 (GND) - Body ground	Always	Below 1 Ω
   E77-2 (SGND) - Body ground	Always	Below 1 Ω

   Tester Connection	Condition	Specified Condition
   E77-7 (B) - E77-1 (GND)	Always	11 to 14 V
   E77-7 (B) - E77-2 (SGND)	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 2: Steering Lock ECU Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Immediately after turning the power switch on (IG), inspect the voltage between terminals 3 (IGE) and 2 (SGND) of the steering lock ECU.
   RESULT
   
   

   Result	Proceed to
   Immediately after turning power switch on (IG), measurement is below 1 V.	A
   Measurement is 11 to 14 V, and measurement never becomes below 1 V.	B

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))

B → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → See step   12 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Select the item "S Code Check" in the Data List and read the value displayed on the Techstream.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   S Code Check	S code match record/NG or OK	NG: S code not matched OK: S code matched	-

   RESULT
   
   

   Result	Proceed to
   NG is displayed on the Techstream screen.	A
   OK is displayed on the Techstream screen.	B

B → See step   7 

A: Go to next step 

1. Replace the certification ECU (ECU aggregation box assembly) with a new one. Refer to REMOVAL .
   NOTE:

   When replacing the certification ECU (ECU aggregation box assembly), registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and turn the Techstream on.
4. Check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   S Code Check	S code match record/NG or OK	NG: S code not matched OK: S code matched	-

   OK

   OK is displayed on the Techstream screen.

NG → See step   11 

OK → END 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Select the item "L Code Check" in the Data List and read the value displayed on the Techstream.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   L Code Check	L code match record/NG or OK	NG: L code not matched OK: L code matched	-

   RESULT
   
   

   Result	Proceed to
   NG is displayed on the Techstream screen.	A
   OK is displayed on the Techstream screen.	B

B → See step   9 

A: Go to next step 

1. Replace the ID code box (immobiliser code ECU) with a new one. Refer to REMOVAL .
   NOTE:

   When replacing the ID code box (immobiliser code ECU), registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and turn the Techstream on.
4. Check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   L Code Check	L code match record/NG or OK	NG: L code not matched OK: L code matched	-

   RESULT
   
   

   Result	Proceed to
   NG is displayed on the Techstream screen.	A
   OK is displayed on the Techstream screen.	B

B → END 

A: Go to next step 

1. Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to DISASSEMBLY .
   NOTE:

   When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed according to the "Registration" procedures. Refer to REGISTRATION .

2. Turn the power switch on (IG).
3. Check the steering lock.

   OK

   Steering lock is released and EV system starts.

NG → See step   13 

OK → END