← GS Lexus GS repair manuals →
Autopapyrus · Lexus GS (S190)
https://autopapyrus.com/guides/lexus/gs/headlight-leveling-actuator-servo-motor-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Lexus GS (S190): Headlight Leveling Actuator (Servo Motor) Replacement

On a 2008 GS with xenon headlights, the auto-leveling system tilts the headlight reflector with an actuator that receives a signal from the vehicle height sensors. A faulty actuator shows up as a system fault code, a headlight beam that is stuck aimed too high or too low, and a whirring noise in the headlight. The exact step-by-step procedure for this model is not documented in publicly available service materials, so the general approach is given below. Check torque specs and fastener locations against the manufacturer's service manual.

Difficulty: Medium Time: 1-2 hours per headlight Steps: 11

Parts

2
№PartGenuine part no.
01 Headlight leveling actuator (electric motor) with link rod/shaftleft and right, for the matching side 85661-48030
02 Headlight assemblyif the actuator is not sold separately

Part numbers are from the manufacturer's original catalogue. Check them against your VIN before ordering.

Tools

7
  • Socket set and ratchet (8, 10, 12 mm)
  • Phillips and flathead screwdrivers
  • plastic trim clip removers
  • Torx set
  • scan tool with Toyota/Lexus support (for checking codes and calibration)
  • gloves
  • soft pad for the headlight
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online) and 1 more. See manuals →

Step by step

11 steps
  1. Diagnosis. Connect the scan tool, read the lighting system codes (AFS and auto-leveling), and check for any body height sensor codes. If the sensor or the sensor link is faulty, replacing the actuator will not help. Also check the fuse and the headlight connector.
  2. Turn off the engine, switch off the lights, and disconnect the negative battery terminal. Wait 5-10 minutes. A xenon headlight runs on high voltage, so do not touch the ballast connectors while power is on.
  3. Gain access to the rear of the headlight: remove the plastic clips and covers in the wheel well and under the headlight, and the wheel well liner if needed. If necessary, remove the front bumper following the steps for this model (clips and screws along the lower edge and in the wheel wells), or remove the entire headlight.
  4. Disconnect the connectors for the bulb, the ballast, and the actuator. Release the locking tabs with a plastic screwdriver and do not pull on the wires.
  5. Remove the headlight from the body: undo the mounting bolts (usually 3-4, 10 mm) and carefully work the headlight out of its locating clips. Place it on a soft pad.
  6. Remove the rear cover of the headlight and, if needed, take out the xenon bulb and the ballast (wear gloves when handling the bulb and do not touch the glass with your fingers).
  7. Locate the leveling actuator on the back of the reflector. It is held by screws or a clip, and the shaft is connected to the movable reflector by a ball-socket end. Note the position of the shaft and disconnect the end from the reflector without jerking, so you do not break the ball socket.
  8. Remove the actuator fasteners and take the actuator off. Install the new actuator in the same position and connect the shaft to the reflector.
  9. Reassemble the headlight in reverse order. Check the rear cover seal. It must be intact, or the headlight will fog up. Tighten the headlight mounting bolts moderately, without overtightening the plastic tabs (a guideline is 5-8 N·m (4-6 lb-ft); use the exact value from the manufacturer's service manual).
  10. Reconnect the battery, turn the ignition on, and switch on the low beams. The headlight should run a self-test, and the actuator should move through its full travel. Clear the codes with the scan tool.
  11. Perform the auto-leveling calibration or initialization according to the service manual (vehicle on level ground, normal load, tire pressure correct). Then check and adjust the beam aim on an aiming stand or against a wall.

Common mistakes and warnings

  • Xenon headlights run on high voltage, so disconnect the power during replacement and do not touch the ballast contacts
  • Incorrect beam aim blinds oncoming drivers, so always check the beam aim after replacement
  • If you have no experience removing bumpers and headlights, or you do not have a scan tool for calibration, it is better to take the car to a repair shop