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ELECTRIC SYSTEM AUTO PARTS: HEADLIGHT MOTOR
HOW TO DETECT THE HEADLIGHT ADJUSTMENT STEPPER MOTOR FAILURE
Diagnostics of the headlight adjustment stepper motor can be easily performed on your own. The inspection method is selected depending on the failure nature. If, when switching on the ignition and trying to adjust the headlights, you do not hear the specific buzz, check the supply circuit for integrity. For this, you have to disconnect the wire harness from the component and fix the test probes on its terminals. Then you should switch on the ignition and check the voltage between the appropriate terminals, adjusting the headlights position with the switch situated in the cabin. If a break in the adjuster power supply circuit is not discovered, the component requires replacement.
If the buzzing is heard when you switch on the adjuster, but the light is not adjusted, the teeth of the rod or gear may have been scuffed. But the problem can be not only in the electric motor, but in the jammed headlight reflector.
If the headlight adjuster is operating erratically, you need to disassemble the electric motor. Contact oxidation, wear of graphite tracks, gear teeth and rod indicate that the part requires replacement.
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