Steering Column: Description and Operation

STEERING COLUMN: STEERING LOCK SYSTEM: SYSTEM DIAGRAM





Circuit Description





* *: for Automatic Transaxle





SYSTEM DESCRIPTION

1. UNLOCK OPERATION CONDITIONS FOR STEERING LOCK

(a) When the following condition is met, the unlock operation is performed:

(1) The engine switch is on (ACC) or on (IG).

HINT
When the engine switch is turned on (ACC) or on (IG) and the electrical key transmitter and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.

(b) When any of the following conditions are met, verification is performed.

* The engine switch is pressed.

* The brake pedal (for Automatic Transaxle) or clutch pedal (for Manual Transaxle) is depressed so that the engine can be started.

* 30 seconds elapse after opening and closing a door.

HINT
* Verification occurs when the code emitted from the electrical key transmitter and the code calculated by the certification ECU (smart key ECU assembly) are compared to check that they match.
* Certification ECU (smart key ECU assembly) verification occurs when the S code and L code are verified while the engine is being started or the engine switch is being pushed. The ID code box (immobiliser code ECU) uses the S code to determine whether the certification ECU (smart key ECU assembly) is authorized. The steering lock ECU uses the L code to determine whether the ID code box (immobiliser code ECU) is authorized.

2. LOCK OPERATION CONDITIONS FOR STEERING LOCK

(a) When all of the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed.

(1) The engine switch is off.

(2) The shift lever is in P.*1

(3) A door is opened or a door lock operation (entry door lock, wireless door lock or key-linked lock operation*2) is performed.

HINT
*1: for Automatic Transaxle

*2: This is the lock/unlock operation with the mechanical key.

3. ENGINE SWITCH INDICATOR FUNCTION

(a) The engine switch indicator blinks in amber indicating a malfunction is present when one of the following occurs: 1) A vehicle speed information malfunction (vehicle speed mismatch) is detected, 2) a malfunction which may result in the steering lock not operating correctly is detected (however, the steering lock operates properly), or 3) a malfunction in the IG control circuit (hold circuit) is detected. If a malfunction which results in the indicator blinking in amber occurs, the engine cannot be started once it is turned off.

HINT
DTCs are stored in all cases listed above.

4. STEERING LOCK ECU DESCRIPTION

(a) The steering lock ECU is built into the steering lock actuator assembly of the steering column assembly.

(b) The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).