Inspection Procedure

HINT:

When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:

With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

NOTE: If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P, open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.

CHECK VEHICLE CONDITION

Check the problem symptom of the steering lock system.

Result

RESULT CHART

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

B: Go to step 5

A: Go to next step

READ VALUE USING TECHSTREAM (LOCK/UNLOCK RECEIVE)

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

Smart Key

SMART KEY - DATA LIST

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: Go to SMART KEY SYSTEM (START FUNCTION) (HOW TO PROCEED WITH TROUBLESHOOTING) (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: Go to next step.

INSPECT STEERING LOCK ECU

Immediately after turning the engine switch on (IG), measure the voltage between terminals E26-3 (IGE) and E26-1 (GND) of the steering lock ECU.

Result

RESULT CHART

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

B: Go to SMART KEY SYSTEM (START FUNCTION) (PROBLEM SYMPTOMS TABLE) (See PROBLEM SYMPTOMS TABLE )

Fig 1: Identifying E26 Steering Lock ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A: Go to next step

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU)

Fig 2: Identifying E26 Steering Lock ECU Connector And E1 Main Body ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the E26 steering lock ECU connector.
Disconnect the E1 main body ECU connector.

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

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E26-3 (IGE) - E1-19 (SLR*)	Always	Below 1 Ω
E26-3 (IGE) or E1-19 (SLR+) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

INSPECT STEERING LOCK ECU

Move the shift lever to P.
Turn the engine switch off.
Open the driver side door.

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

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E26-3 (IGE) - E26-1 (GND)	Steering lock motor operating	Below 1 V
E26-3 (IGE) - E26-1 (GND)	Steering lock motor not operating	11 to 14 V

NG: Go to step 6

Fig 3: Identifying E26 Steering Lock ECU Connector Terminals