Unable to Unlock Steering Wheel: Procedure

1. Check whether the engine switch can be turned on (IG) when the shift lever is in P and the brake pedal is depressed.

   OK

   Engine switch can be turned on (IG).

NG → See step   12 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Check the DTCs of the main body ECU by following the prompts displayed on the Techstream screen.

   OK

   No DTCs related to main body ECU are output.

NG → GO TO RELEVANT DTC  DIAGNOSTIC TROUBLE CODE CHART 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Check the DTCs of the certification ECU by following the prompts displayed on the Techstream screen.

   OK

   No DTCs related to certification ECU are output.

NG → GO TO RELEVANT DTC  DIAGNOSTIC TROUBLE CODE CHART 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Within 10 seconds of the engine switch being turned on (IG), check the Data List and read the value displayed on the Techstream screen.
   SMART KEY
   
   

   Item	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   7 

OK: Go to next step 

Fig 1: Identifying Steering Lock ECU Connector Terminals (Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E77 steering lock ECU connector.
2. Measure the resistance and voltage according to the value(s) in the table below.

   Standard Voltage

   Standard resistance 

   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

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 2: Identifying Steering Lock ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   HINT: 

   When the engine switch is turned on (IG), the steering lock motor activates for 2 to 15 seconds.

   RESULT
   
   

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

B → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → See step   16 

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

   Item	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   9 

A: Go to next step 

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

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

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

   Item	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   17 

OK → See step   13 

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

   Item	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   11 

A: Go to next step 

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

   When replacing the ID code box, registration must be performed according to the "Registration" procedures. Refer to REMOVAL .

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

   Item	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	-

   OK

   OK is displayed on the Techstream screen.

NG → See step   18 

OK → See step   14 

1. Replace the steering lock ECU with a new one. Refer to REMOVAL .
   NOTE:

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

2. With the shift lever in P and the brake pedal depressed, turn the engine switch on (IG).
3. Check whether the steering lock can be released by turning the steering wheel, and check that the engine starts.

   OK

   Steering lock is released and engine starts.

NG → See step   19 

OK → See step   15