Suspension Control: Other Lexus RX II facelift

PRECAUTION

Note. When disconnecting the negative (-) battery terminal, initialize the following systems after the terminal is reconnected.

SYSTEM INITIALIZATION TABLE

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1. JACK OR LIFT UP AND DOWN Follow the procedure below when raising the vehicle with a jack or lift. Turn the ignition switch to the ON position. Press the height control OFF switch button and check that the height control "OFF" indicator light comes on. Turn the ignition switch off. Raise the vehicle. Follow the procedure below when lowering the vehicle. Lower the vehicle slowly to the ground. Turn the ignition switch to the ON position. Press that the OFF indicator goes out and that the height control operates.
2. REMOVE FRONT SUSPENSION OR FRONT AXLE Do not turn the lower part of the pneumatic cylinder assembly without air in it, otherwise the diaphragm might be twisted or damaged. To avoid damage, follow the procedure below when using a compressor to fill the cylinders with air. Stop the compressor as well as the engine in 1 minute after the engine starts. Restart the engine, and stop the engine in 1 minute. HINT: It takes about 2 to 3 minutes to fill the pneumatic cylinders with air when replacing all of them. Inject the air in a location where the ambient temperature is below 35°C (95°F).
3. REMOVE HEIGHT CONTROL VALVE NO.1 AND NO.2 Be careful that the vehicle body lowers because the air in the pneumatic cylinder is discharged by disconnecting the pneumatic cylinder side air tube of the height control valve.
4. DISCONNECT AND CONNECT HEIGHT CONTROL TUBE (Type 1) NOTE: Disconnecting and connecting the height control tube should be performed by hand to prevent dust or foreign objects from entering. Be careful not to damage the height control tube. Disconnect the height control tube. Loosen the locknut. NOTE: Stabilize the chamber of the pneumatic cylinder assembly with your hands to avoid movement. Disconnect the tube from the pneumatic cylinder. Remove the 2 O-rings. Install the height control tube. Install the 2 new O-rings to the height control tube and coat them with MP grease No. 2. NOTE: Air leaks may occurs if dust or foreign objects come into contact with the O-rings. Insert the tube into the pneumatic cylinder assembly and connect the tube with a lockout. Torque: 17 N*m (175 kgf*cm, 13 ft.*lbf) NOTE: Stabilize the chamber of the pneumatic cylinder assembly with your hands to avoid movement.
5. DISCONNECT AND CONNECT HEIGHT CONTROL TUBE (Type 2) NOTE: Disconnecting and connecting the height control tube should be performed by hand to prevent dust or foreign objects from entering. Be careful not to damage the height control tube. Disconnect the height control tube. Pinch "A" to release connector No. 1 and pull it out from the housing. Set SST to the tube. SST 09730-00010 Insert SST into the housing to expand the claw of plug or tube connector in the housing. Pull out the tube with SST inserted. NOTE: Do not force the tube. Insert a flat-head thin-blade screwdriver into the circular hole on the housing, and remove connector circular hole on the housing, and remove connector No. 2, the 2 O-rings and the plate from the housing. HINT: The O-ring, the plate and connector No. 2 are non-reusable parts. Install the 2 O-rings and the plate. NOTE: When replacing the parts on which the tube to be installed with new ones, it is not necessary to perform the procedure for installation. Apply MP grease to the 2 new O-rings and plate, and then install them to the straight tube or an equivalent. NOTE: Install the plate between the O-rings. Air leaks may occur if dust or foreign objects come into contact with the O-rings. Insert the tube onto which the 2 O-rings and plate are installed into the housing, and then push them in lightly with rolled up cardboard. Push connector No. 2 into the housing until a clicking sound is heard. Install the height control tube. Push the tube and connector No. 1 to the housing until a clicking sound is heard. NOTE: Turn the phase of the housing port from that of the connector No. 1 claw by 90°C when installing. Lightly pull on the tube to make sure that it is securely connected.
6. DISCONNECT AND CONNECT HEIGHT CONTROL TUBE (Type 3) NOTE: Disconnecting and connecting the height control tube should be performed by hand to prevent dust or foreign objects from entering. Be careful not to damage the height control tube. Disconnect the height control tube. Remove the holder. Spread the clip and slowly pull the height control tube No. 2 straight out. NOTE: Do not completely remove the clip except when replacing it. Remove the 2 O-rings. HINT: Some tubes are equipped with only one O-ring. Install the height control tube. Hook one side of the new clip around the union groove, and slide the other side into the opposite side of the union groove. Install 2 new O-rings to the height control tube and coat them with MP grease No. 2. NOTE: Air leaks may occur if dust or foreign objects come into contact with the O-rings. Connect the height control tube to the connector on the straight and securely until a click sound can be heard. HINT: Some tubes are equipped with only one O-ring. NOTE: Connect the height control tube straight in order to prevent air leaks. Install the height control tube to the holder being careful not to apply excessive force to the clip.

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1. ADJUST STANDARD VEHICLE HEIGHT Release the parking brake and stabilize the suspensions by pushing up and down on the corners of the vehicle. Adjust the shift lever to the N position and settle the tires by shifting the vehicle back and forth by hand. Start the engine. On the height control switch, first press "HI" to raise the vehicle's height, and next press "LO" to lower it, and then press the switch to change it to the "N" position. NOTE: Make sure to release the parking brake and adjust the shift lever to the N position.
2. INSPECT TIRE
3. ADJUST VEHICLE HEIGHT
4. ADJUST VEHICLE HEIGHT
5. INSPECT VEHICLE HEIGHT SWITCH FUNCTION NOTE: Perform the procedure with the vehicle vacant and unloaded. Change the height control switch from the "N" position to the "HI" position and back to the "N" position again. Check the time it took and the degree of change in the vehicle's height to reach the target height. "N" --> "HI" position: approx. 40 to 60 seconds "HI" --> "N" position: approx. 20 to 40 seconds Change in vehicle height: approx. 30 mm (1.18 in.) NOTE: Shut off the engine to check the vehicle height. Change the vehicle height control switch from the "N" position to the "LO" position and back to the "N" position again. Check the time it took and the degree of change in the vehicle's height to reach the height target height. "N" --> "LO" position: approx. 10 to 30 seconds "LO" --> "N" position: approx. 20 to 40 seconds Change in vehicle height: approx. 15 mm (0.59 in.) NOTE: Shut off the engine to check the vehicle height.
6. INSPECT GET ON AND OFF MODE FUNCTION Turn the access mode switch ON and check the change in the vehicle's height with the engine stopped. Change in the vehicle height, Down from "N" position: approx. 30 mm (1.18 in.) NOTE: When the function inspections are performed in succession, the vehicle height control is interrupted.
7. INSPECT AUTOMATIC LEVELING FUNCTION NOTE: Make sure the height control switch is in the "NORM" position and the access mode switch is OFF. Turn the ignition switch OFF and have four people (two in the front, two in the rear) ride in the vehicle. HINT: Each person should weigh approx. 68 kg. Start the engine and check the time it takes to complete vehicle height control. Time to target height: approx. 40 to 60 seconds Turn the ignition switch OFF and than have the four people get out of the vehicle. Start the engine and check the time it takes to complete vehicle height control. Time to target height: approx. 10 to 30 seconds
8. CHECK CONNECTIONS OF TIRES FOR AIR LEAKAGE Set the height control switch to the "HI" position and raise the vehicle's height. Stop the engine. Apply soapy water to the connections of the tubes and check if there is any air leakage.

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1. PRECAUTION NOTE: When disconnecting the negative (-) terminal cable of the battery, initialize the following systems after the completion of the operation. SYSTEM INITIALIZATION TABLE System Name See procedure Lighting System (Adapting Front Lighting System) «INITIALIZATION»(ref-236032-S32462476002006062900000) Power Window System «INITIALIZATION»(ref-236041-S15540293112006062900000) Power Back Door System «INITIALIZATION»(ref-236020-S42734098382006062900000) Sliding roof system «INITIALIZATION»(ref-236021-S01691602862006062900000)
2. AIR SUSPENSION SYSTEM PRECAUTION Note for operation When you work under or when jacking it up, make sure the height control OFF switch to prohibit controlling the height of the vehicle is on. HINT: When the height control OFF switch is operated to prohibit controlling the vehicles height, the height control OFF indicator light on the combination meter comes on. The auto leveling control and access mode control continue to control for max. 60 seconds after turning the ignition switch OFF. Disallowance of the height control OFF switch is recorded even when the negative terminal of the battery is disconnected. Disallowance of the vehicle height control by the height control OFF switch is released at the vehicle speed of 30 km/h (19 mph) or more. Do not operate the steering wheel, if there is no air in the pneumatic cylinder. HINT: The pneumatic cylinder could be damaged if it is twisted without air in the cylinder. In the case of letting down the vehicle without air in the cylinder, make sure all the pipes are securely connected. HINT: The pneumatic cylinder could be damaged if there is any pipe disconnected while letting down the vehicle. Do not apply battery voltage to the compressor motor for more than 60 seconds to prevent damage to the motor. HINT: In the case where it is necessary to perform the operation by charging the battery for more than 60 seconds, for example height recovery without air in the cylinder, proceed the operation as follow: after 60 seconds have passed, turn the ignition switch OFF once, and then turn the ignition switch ON again for commencement of operation. Note for connector operation. In the case where disconnecting the connectors for height control sensor rear RH and height control valve sub-assembly No. 2, it possible causes incorrect connection. Since these 2 connectors have the same shape, they may be connected incorrectly unless the clamp of wire harness is properly connected. When you connecting the connectors, confirm a mark (white tape) on the wire harness of height control sensor rear RH and the clamp position of wire harness.
3. FAIL-SAFE FUNCTION When a Air Suspension System malfunction is detected under the normal control operation, the suspension control ECU will suspected the switch control of the height control operation.

FAIL-SAFE FUNCTION CHART