Lexus NX: Installation
INSTALLATION
PROCEDURE
1. INSTALL POWER STEERING ECU ASSEMBLY
(a) Install a new electric power steering motor shaft damper to the power steering ECU assembly.
(b) Install a new electric power steering motor shaft spacer to the power steering ECU assembly.
| (c) Temporarily install the power steering ECU assembly to the electric power steering column sub-assembly with the 3 bolts. NOTICE: Do not tighten the bolts until the heads contact the surface of the power steering ECU assembly. Leave a small amount of clearance so that the power steering ECU assembly can be centered in a later procedure. |
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(d) Remove the No. 2 steering intermediate shaft assembly from the electric power steering column sub-assembly.
| (e) Secure the electric power steering column sub-assembly in a vise between aluminum plates or pieces of cloth as shown in the illustration. NOTICE:
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(f) Install the 2 nuts to the electric power steering column sub-assembly.
HINT:
The nuts to use are the steering wheel set nut or equivalents.
| Steering wheel set nut part No. | Thread diameter | Thread pitch |
|---|---|---|
| 90179-12071 | 12 mm (0.4724 in.) | 1.25 mm (0.0492 in.) |
| (g) Turn the steering main shaft by 180° to the left and right at a speed of 1 turn per second. Repeat these movements 2 to 3 times to center the power steering ECU assembly. |
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(h) Tighten the 3 bolts.
Torque:
18.5 N·m {189 kgf·cm, 14 ft·lbf}
| (i) Check the turning torque of the steering main shaft. Standard preload: 0.9 to 1.5 N*m (10 to 15 kgf*cm, 8 to 13 in.*lbf) NOTICE: Make sure that the shaft turns smoothly. HINT: If the result is not as specified, center the power steering ECU assembly again. |
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(j) Install the No. 2 steering intermediate shaft assembly to the electric power steering column sub-assembly.
Torque:
35.3 N·m {360 kgf·cm, 26 ft·lbf}
(k) Connect the 2 connector clamps of a new ECU wire harness sub-assembly to the harness bracket.
(l) Connect the 3 connectors to the power steering ECU assembly.
(m) Install the 2 cable ties and heat resistant tape.
| *a | Cable Tie | *b | Heat Resistant Tape |
NOTICE:
As heat from the power steering motor assembly may generate smoke, use heat resistant tape (resistant to 100°C (212°F) or higher).
(n) Install a new power steering ECU protector to the power steering ECU assembly.
2. INSTALL ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY
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3. PERFORM TORQUE SENSOR ZERO POINT CALIBRATION
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4. PERFORM ASSIST MAP WRITING
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Precaution
PRECAUTION HANDLING PRECAUTIONS FOR SRS AIRBAG SYSTEM (a) This vehicle is equipped with a Supplemental Restraint System (SRS). Failure to carry out service operations in the correct sequence could cau
Parts Location
PARTS LOCATION ILLUSTRATION *1 POWER STEERING ECU ASSEMBLY *2 ELECTRIC POWER STEERING COLUMN SUB-ASSEMBLY - POWER STEERING MOTOR ASSEMBLY - MOTOR ROTATION ANGLE SENSOR - TORQUE SENSOR - ECU
SEE MORE:
Power Steering Warning Light Circuit
DESCRIPTION The power steering ECU is connected to the combination meter via CAN communication. If any of the following conditions are detected, the power steering warning light remains on.
The circuit that supplies power source voltage to the power steering ECU assembly (terminal IG) is open.
Rear Door Courtesy Switch
ComponentsCOMPONENTS ILLUSTRATION *1 REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY - - N*m (kgf*cm, ft.*lbf): Specified torque - - RemovalREMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
