Toyota TechDoc

STEERING LOCK SYSTEM > Steering Lock Motor Drive Power Circuit

for Preparation Click here

DESCRIPTION

The steering lock actuator assembly (steering lock ECU) is connected to the power management control ECU*1 (power source control ECU*2) and certification ECU. The steering lock ECU cannot activate the motor unless it receives permission signals from both ECUs. (The power management control ECU*1 or power source control ECU*2 permits the steering lock ECU to supply power to activate the motor.)

*1: for 1KR-FE, 1NR-FE
*2: for 1ND-TV

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When the engine switch is off, the power management control ECU*1 or power source control ECU*2 may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following step to wake up the ECU.

Connect the intelligent tester to the DLC3 with the engine switch off, and turn any door courtesy switch ON and OFF at 1.5-second intervals until communication between the intelligent tester and the vehicle begins.

*1: for 1KR-FE, 1NR-FE
*2: for 1ND-TV

1.CHECK VEHICLE CONDITION

Check the problem symptom of the steering lock system.
Result
Condition
Proceed to
Steering lock cannot be released
A
Steering cannot be locked
B

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

Go to step 6

A

2.READ VALUE USING INTELLIGENT TESTER (LOCK/UNLOCK RECEIVE)

Turn the engine switch off.

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester on.

Enter the following menus: Body / Entry and Start / Data List.

Select the item below in the Data List, and read its value displayed on the intelligent tester.

Entry and Start
Tester Display
Measurement Item/Range
Normal Condition
Diagnosis 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
-

Entry and Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnosis 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	-

Check if a steering unlock command signal has been received.
OK:
"YES" is displayed on the tester display.

CHECK ENTRY AND START SYSTEM (Click here)

OK

3.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
D33-3 (IGE) - D33-1 (GND)
Engine switch off
Engine switch on (ACC or IG)
Motor activated: Below 1 V
Motor not activated:
11 to 14 V
Text in Illustration
*1
Component with harness connected:
(Steering Lock Actuator Assembly (Steering Lock ECU))

Go to step 4

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)

Disconnect the connector from the steering lock actuator assembly (steering lock ECU).

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
D33-1 (GND) - Body ground
Always
Below 1 Ω
Text in Illustration
*1
Front view of wire harness connector:
(to Steering Lock Actuator Assembly (Steering Lock ECU))

Text in Illustration
*1	Front view of wire harness connector: (to Steering Lock Actuator Assembly (Steering Lock ECU))

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT (SOURCE) CONTROL ECU)

for 1KR-FE, 1NR-FE
1. Disconnect the connector from the power management control ECU.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  D33-3 (IGE) - D38-8 (SLR+)
  Always
  Below 1 Ω
  D33-3 (IGE) - Body ground
  Always
  10 kΩ or higher
  Text in Illustration
  *1
  Rear view of wire harness connector:
  (to Power Management Control ECU)
  *2
  Front view of wire harness connector:
  (to Steering Lock Actuator Assembly (Steering Lock ECU))

Text in Illustration
*1	Rear view of wire harness connector: (to Power Management Control ECU)
*2	Front view of wire harness connector: (to Steering Lock Actuator Assembly (Steering Lock ECU))

for 1ND-TV
1. Disconnect the connector from the power source control ECU.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  D33-3 (IGE) - D73-8 (SLR+)
  Always
  Below 1 Ω
  D33-3 (IGE) - Body ground
  Always
  10 kΩ or higher
  Text in Illustration
  *1
  Rear view of wire harness connector:
  (to Power source Control ECU)
  *2
  Front view of wire harness connector:
  (to Steering Lock Actuator Assembly (Steering Lock ECU))
  Result
  Result
  Proceed to
  NG
  A
  OK (for 1KR-FE, 1NR-FE)
  B
  OK (for 1ND-TV)
  C

Text in Illustration
*1	Rear view of wire harness connector: (to Power source Control ECU)
*2	Front view of wire harness connector: (to Steering Lock Actuator Assembly (Steering Lock ECU))

Result
Result	Proceed to
NG	A
OK (for 1KR-FE, 1NR-FE)	B
OK (for 1ND-TV)	C

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)

REPLACE POWER SOURCE CONTROL ECU (Click here)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D33-3 (IGE) - D33-1 (GND)	The specified condition should be checked after performing the following: Move the shift lever to P Turn the engine switch off Open the driver door	Motor activated: Below 1 V Motor not activated: 11 to 14 V

Text in Illustration
*1	Component with harness connected: (Steering Lock Actuator Assembly (Steering Lock ECU))

Go to step 7

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

7.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT (SOURCE) CONTROL ECU)

for 1KR-FE, 1NR-FE
1. Disconnect the connector from the power management control ECU.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  D33-3 (IGE) - D38-8 (SLR+)
  Always
  Below 1 Ω
  D33-3 (IGE) - Body ground
  Always
  10 kΩ or higher
  Text in Illustration
  *1
  Rear view of wire harness connector:
  (to Power Management Control ECU)
  *2
  Front view of wire harness connector:
  (to Steering Lock Actuator Assembly (Steering Lock ECU))

for 1ND-TV
1. Disconnect the connector from the power source control ECU.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  D33-3 (IGE) - D73-8 (SLR+)
  Always
  Below 1 Ω
  D33-3 (IGE) - Body ground
  Always
  10 kΩ or higher
  Text in Illustration
  *1
  Rear view of wire harness connector:
  (to Power source Control ECU)
  *2
  Front view of wire harness connector:
  (to Steering Lock Actuator Assembly (Steering Lock ECU))
  Result
  Result
  Proceed to
  NG
  A
  OK (for 1KR-FE, 1NR-FE)
  B
  OK (for 1ND-TV)
  C

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)

REPLACE POWER SOURCE CONTROL ECU (Click here)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection	Switch Condition	Specified Condition
D33-3 (IGE) - D33-1 (GND)	Engine switch off Engine switch on (ACC or IG)	Motor activated: Below 1 V Motor not activated: 11 to 14 V