Steering: Description and Operation

This system operates with both the tilt function and telescopic function driven automatically by the motor and controlled by the ECU. The steering can be adjusted steplessly forward and back, and up and down, to provide the most suitable steering position for easy driving, with automatic movement of the steering to a position which facilitates getting in and out of the vehicle.

The driver can have the most appropriate driving position memorized by operating the power seat and remote control mirror together with the tilt and power telescopic steering.

Current is always applied through the PWR fuse to TERMINAL +B of the tilt and power telescopic ECU and through the DOME fuse to TERMINAL ECUB of the tilt and power telescopic ECU.

With the ignition SW turned ON, the current flows from ECU-IG fuse to TERMINAL IG of the tilt and power telescopic ECU.

1. MANUAL TILT OPERATION
When the ignition key is inserted into the ignition key cylinder (Unlock warning SW ON), a signal is input to TERMINAL UWSW of the tilt and power telescopic ECU. If the manual SW is pushed to the "TILT UP" side, current flows from TERMINAL VC of the tilt and power telescopic ECU to TERMINAL MSW of the tilt and power telescopic ECU passing through the manual SW. (The ECU detects the manual SW position by the volume of current.)

As a result, tilt and power telescopic ECU operates and the current to TERMINAL +B of the ECU flows from TERMINAL TIM+ to TERMINAL 1 of the tilt and power telescopic unit to TERMINAL 2 of the tilt control motor to TERMINAL 1 to TERMINAL 10 of the tilt and power telescopic unit to TERMINAL TIM- of the tilt and power telescopic ECU to TERMINAL GND to GROUND, and the tilt up function operates as long as the manual SW is pushed to the "TILT UP" side.

For tilt down operation, when the manual SW is pushed to the "TILT DOWN" side, the current flowing from ECU to motor flows to TERMINAL TIM- of the tilt and power telescopic ECU to TERMINAL 10 of the tilt and power telescopic unit to TERMINAL 1 of the tilt control motor to TERMINAL 2 to TERMINAL 1 of the tilt and power telescopic unit to TERMINAL TIM+ of the tilt and power telescopic ECU, so the motor rotates in the reverse direction to tilt up operation, and tilt down operation occurs only while the manual SW is being pushed.

2. MANUAL TELESCOPIC OPERATION
When the ignition key is inserted into the ignition key cylinder (Unlock warning SW ON), a signal is input to TERMINAL UWSW of the tilt and power telescopic ECU. When the manual SW is pushed toward "TELESCO SHORT" side, current flows from TERMINAL VC of the tilt and power telescopic ECU to TERMINAL MSW of the tilt and power telescopic ECU through the manual SW.

As a result, the tilt and power telescopic ECU operates and the current to TERMINAL +B of the tilt and power telescopic ECU flows from TERMINAL TEM+ of the tilt and power telescopic ECU to TERMINAL 6 of the telescopic position sensor to TERMINAL 2 of the telescopic control motor to TERMINAL 6 to TERMINAL 3 of the telescopic position sensor to TERMINAL TEM- of the tilt and power telescopic ECU to TERMINAL GND to GROUND, and telescopic short operation occurs as long as the manual SW is pushed the to "TELESCO SHORT" side.

For telescopic long operation, when the manual SW is pushed to the "TELESCO LONG" side, current flowing from the tilt and power telescopic ECU to the motor flows through TERMINAL TEM- of the tilt and power telescopic ECU to TERMINAL 3 of the telescopic position sensor to TERMINAL 1 of the telescopic control motor to TERMINAL 2 to TERMINAL 6 of the telescopic position sensor to TERMINAL TEM+ of the tilt and power telescopic ECU to TERMINAL GND to GROUND.

As a result, the motor rotates in reverse to the telescopic short mode and telescopic long operation occurs as long as the manual SW is pushed to the "TELESCO LONG" side.

3. AUTO AWAY OPERATION
When the ignition SW is turned from ON to OFF, the current stops flowing from the ECU-IG fuse to TERMINAL IG of the tilt and power telescopic ECU and is input as a signal that the ignition SW is OFF. When the auto SW is turned ON, an auto SW ON, signal is input to TERMINAL ASW of the tilt and power telescopic ECU.

If the ignition key is removed from the ignition key cylinder (Unlock warning SW OFF) at this time, a signal is input from TERMINAL UWSW of the tilt and power telescopic ECU. Also, the tilt position sensor input into TERMINAL TIS of the tilt and power telescopic ECU a signal of the steering tilt position just before the ignition SW (for unlock warning) is turned from ON to OFF.

As a result, the tilt and power telescopic ECU operates and the current to TERMINAL +B of the tilt and power telescopic flows from TERMINAL TIM+ of the tilt and power telescopic ECU to TERMINAL 1 of the tilt and power telescopic unit to TERMINAL 2 of the tilt control motor to TERMINAL 1 to TERMINAL 10 of the tilt and power telescopic unit to TERMINAL TIM- of the tilt and power telescopic ECU to TERMINAL GND to GROUND, causing the motor to rotate so that tilt-up operation occurs automatically.

At the same time, the current from TERMINAL +B of the tilt and power telescopic ECU to TERMINAL TEM+ flows from TERMINAL 6 of the telescopic position sensor to TERMINAL 2 of the telescopic control motor to TERMINAL 1 to TERMINAL 3 of the telescopic position sensor to TERMINAL TEM- of the tilt and power telescopic ECU to TERMINAL GND to GROUND, causing the motor to rotate so that telescopic short operation occurs on auto and with tilt up operation occurring simultaneously on auto, auto away operation occurs.

4. AUTO RETURN OPERATION
When the steering is in auto away condition and the ignition key is inserted into the ignition key cylinder (Unlock warning SW ON), a signal is input to TERMINAL UWSW of the tilt and power telescopic ECU.

As a result, the tilt and power telescopic ECU operates and the current to TERMINAL +B of the tilt and power telescopic ECU flows from TERMINAL TEM- of the tilt and power telescopic ECU to TERMINAL 3 of the telescopic position sensor to TERMINAL 1 of the telescopic control motor to TERMINAL 2 to TERMINAL 6 of the telescopic position sensor to TERMINAL TEM+ of the tilt and power telescopic ECU to TERMINAL GND to GROUND, and at the same time, current flows from TERMINAL TIM- of the tilt and power telescopic ECU to TERMINAL 10 of the tilt and power telescopic unit to TERMINAL 1 of the tilt control motor to TERMINAL 2 to TERMINAL 1 of the tilt and power telescopic unit to TERMINAL TIM+ of the tilt and power telescopic ECU to TERMINAL GND to GROUND, causing both the tilt control motor and telescopic control motor to rotate. The motors continue to rotate until the signals input from the tilt position sensor to TERMINAL TIS of the tilt and power telescopic ECU and from the telescopic position sensor to TERMINAL TES of the tilt and power telescopic ECU (Signals informing the ECU of the current position of the steering) match the position memorized by the ECU prior to auto away operation.

In this way, the steering position is automatically returned to the original position.

When the ignition SW is turned from OFF to ON or the shift lever is shifted to a position other than "P" (A/T), or parking brake lever released (M/T), auto operation is stopped.