STEERING LOCK SYSTEM ECU Power Source Circuit
DESCRIPTION
This circuit supplies voltage from the battery to terminal B of the steering lock actuator assembly (steering lock ECU). This circuit is used as the power source for the steering lock CPU, the motor, communication, and the peripheral circuits.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Tech Tips
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
PROCEDURE
-
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)
-
Text in Illustration *1 Front view of wire harness connector:
(to Steering Lock Actuator Assembly (Steering Lock ECU))
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
NG 
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK 
-
-
CHECK HARNESS AND CONNECTOR (BATTERY - STEERING LOCK ECU)
Text in Illustration *1 Front view of wire harness connector:
(to 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 D33-7 (B) - Body ground Always 11 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK 
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here
-