Unable to Unlock Steering Wheel

STEERING COLUMN: STEERING LOCK SYSTEM: Unable to Unlock Steering Wheel
- Unable to Unlock Steering Wheel

WIRING DIAGRAM





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.

PROCEDURE

1. CHECK ENGINE SWITCH

(a) 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 -- GO TO ENGINE IMMOBILISER SYSTEM (w/ Smart Key System) How To Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK FOR DTC (MAIN BODY ECU)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) 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
OK -- Continue to next step.

3. CHECK FOR DTC (CERTIFICATION ECU)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) 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
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) 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





OK:

YES is displayed on the Techstream screen.

NG -- READ VALUE USING TECHSTREAM
OK -- Continue to next step.

5. CHECK WIRE HARNESS (STEERING LOCK ECU - BODY GROUND)





(a) Disconnect the E77 steering lock ECU connector.

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

Standard Voltage:

Standard resistance










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK STEERING LOCK ECU





(a) 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





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Removal

7. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Check the Data List and read the value displayed on the Techstream screen.

Smart Key





Result





B -- READ VALUE USING TECHSTREAM
A -- Continue to next step.

8. CHECK OPERATION OF ID CODE BOX

(a) Replace the ID code box with a new one Removal.

NOTICE:
When replacing the ID code box, registration must be performed according to the "Registration" procedures Engine Immobiliser System (W/ Smart Key System).

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and turn the Techstream ON.

(d) Check the Data List and read the value displayed on the Techstream screen.

Smart Key





OK:

OK is displayed on the Techstream screen.

NG -- REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU) Removal

OK -- REPLACE ID CODE BOX Removal

9. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Check the Data List and read the value displayed on the Techstream screen.

Smart Key





Result





B -- CHECK OPERATION OF STEERING LOCK ECU
A -- Continue to next step.

10. CHECK OPERATION OF ID CODE BOX

(a) Replace the ID code box with a new one Removal.

NOTICE:
When replacing the ID code box, registration must be performed according to the "Registration" procedures Removal.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and turn the Techstream on.

(d) Check the Data List and read the value displayed on the Techstream screen.

Smart Key





OK:

OK is displayed on the Techstream screen.

NG -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Removal

OK -- REPLACE ID CODE BOX Removal

11. CHECK OPERATION OF STEERING LOCK ECU

(a) Replace the steering lock ECU with a new one Removal.

NOTICE:
When replacing the steering lock ECU, registration must be performed according to the "Registration" procedures Engine Immobiliser System (W/ Smart Key System).

(b) With the shift lever in P and the brake pedal depressed, turn the engine switch on (IG).

(c) 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 -- REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU) Removal

OK -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Removal