Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Installation

INSTALLATION

PROCEDURE

1. INSTALL POWER STEERING ECU ASSEMBLY

(a) Install 2 service nuts to the steering main shaft. Recommended Service Nut: Thread Diameter 12.0 mm (0.472 in.) Thread Pitch 1.25 mm (0.0492 in.)

(b) Simultaneously rotate the service nut that was installed first counterclockwise and rotate the service nut that was installed second clockwise to lock them.

NOTICE:

Do not apply excessive torque to the service nuts by using a tool such as an impact wrench.

HINT:

The service nuts are used for turning the steering main shaft during inspection of the steering main shaft rotating torque.

Remove the service nuts after performing this procedure.

Grease

(c) Apply grease to a new electric power steering motor shaft damper.

NOTICE:

First wipe off the existing grease from the serrated part, and then apply the dedicated grease supplied with a new power steering ECU assembly or electric power steering column sub-assembly.

(d) Install the electric power steering motor shaft damper to the electric power steering column sub-assembly.

(e) Temporarily install the power steering ECU assembly to the electric power steering column sub-assembly with the 2 bolts. NOTICE: When temporarily installing the 2 bolts to the power steering ECU assembly, do not tighten them all the way down.

(f) Secure the steering column assembly in a vise using aluminum plates, cloths and wooden blocks. NOTICE: Do not overtighten the vise, as the steering column assembly may become deformed. Secure the power steering ECU assembly so that it is upright. Support the steering column assembly with wooden blocks or similar items to ensure that it does not fall.

*a Wooden Block *b Cloth

(g) Rotate the steering main shaft 180 degrees counterclockwise and then 180 degrees clockwise at a speed of 60 rpm, and repeat 2 to 3 times to center the axis of the power steering ECU assembly. [*1]

(h) Tighten the 2 bolts. [*2]

Torque:

18.5 N·m {189 kgf·cm, 14 ft·lbf}

(i) Using a torque wrench, measure the turning torque of the steering main shaft. Preload: 1.3 to 2.7 N*m (13.3 to 27.5 kgf*cm, 11.6 to 23.8 in.*lbf) NOTICE: Ensure that there is no abnormal resistance during rotation. If the turning torque is not as specified, loosen the 2 bolts and repeat steps [*1] and [*2] to recenter the axis of the power steering ECU assembly.

(j) Remove the 2 service nuts.

(k) Connect the connector.

2. INSTALL STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY

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3. INSTALL STEERING COLUMN ASSEMBLY

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4. TORQUE SENSOR ZERO POINT CALIBRATION

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5. ASSIST MAP WRITING

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