Toyota Tundra Service Manual: System Description

SYSTEM DESCRIPTION

1. FUNCTION OF MAIN COMPONENTS

Component

Function

Multiplex tilt and telescopic ECU

This ECU sends a control signal to the tilt motor and telescopic motor, based on signals from each switch, to adjust the steering position.

Tilt motor (steering column assembly)

This motor is activated by a signal from the multiplex tilt and telescopic ECU and adjusts the tilt position.

The tilt position sensor in the motor detects the tilt position by counting the number of pulses as the motor rotates.

Telescopic motor (steering column assembly)

This motor is activated by a signal from the multiplex tilt and telescopic ECU and adjusts the telescopic position.

The telescopic position sensor in the motor detects the telescopic position by counting the number of pulses as the motor rotates.

2. MANUAL OPERATION

(a) The tilt and telescopic positions can be adjusted as desired by operating the tilt and telescopic switch (headlight dimmer switch assembly).

3. AUTO AWAY/RETURN FUNCTION

(a) When the power source is changed from on (ACC) or on (IG) to off, the steering wheel automatically tilts up and fully retracts.

(b) When the power source is changed from off to on (ACC) or on (IG), the steering wheel automatically returns to the previous position which was set before the power source was turned off.

(c) The auto away/return function can be prohibited by using the Techstream.

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4. DRIVING POSITION MEMORY FUNCTION

(a) The system can memorize/recall two driving positions by operating the seat memory switch LH. Even if these positions are changed when a driver is getting in/out, it can recall the memory position by one-touch operation if the steering wheel column position, seat position and outer mirror surface position of the driver are stored.

    Problem Symptoms Table

    System Diagram

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