Both HID bulbs keep flickering and making clicking noise:

1. Ensure that the HID bulbs have been connected to the ballasts correctly and tightly. 2. Ensure the battery is producing at least 12 volts. 3. If your vehicle low beam has daytime running lights, you may need to disconnect those.  Never switch on the HID system until after the motor is running.

HID turns on then both sides go out:

Check all fuses. Please check your fuse box according to your vehicle's user manual and upgrade the stock 10Amp or 15Amp headlight fuse to 30Amp. The 30Amp fuses are 100% safe for your vehicle, they will not cause problems or damage to your vehicle.

Only one light works, although both lights are installed exactly the same:

1.The +/- polarity of one side might not match with the stock harness. 2. The fuse might be blown on one side. 3. Malfunctioned parts.

Inspection Procedure: Check all connections between the bulb, ballast, & relay. Check the fuses. Use at least 30Amp fuse if the stock 15Amp fuse blows. Switch the failing bulb module to the opposite side to see if the problem remains. If the failing light now works, you may have a bad connection on the opposite side, or the ballast may have failed. If the problem still persists, the Ballast and/or Bulb may have failed. Check the ballasts and bulbs.  Switch one to the working side of the vehicle. If the problem still persists, the ballast and/or bulb is malfunctioning.

The ballasts make electrical noise when first turn on:

This is normal, the ballasts are absorbing powers from the battery to start up, that's why you hear electric noise.

The HID works initially but starts to flicker sometimes:

This may be caused by a loose connection, low battery voltage or damaged bulbs or ballasts.  Never switch on the HID system until after the motor is running.

Inspection Procedure: Switch off the HID system immediately. Disconnect each connector and clean with alcohol. Wait more than 5 minutes (to allow the Ballast Safety Micro Chip to reset).  Reconnect each connector.

HID will only work when the high beam is turn on:

Make sure you have plugged in all wires correctly to their positions and +/- polarity is correct.
 
The HID bulbs changes color when first turn on:

This is normal. At the beginning, the ballasts are storing the power from the battery of the car. Since the power has not been stabilized yet, the bulbs will might have different colors or even flicker a little bit. As soon as the power is stabilized to the ballast, the bulbs will light normally.

The colors or lighting effects of the two bulbs are different:

1. The level of the two sizes' headlight housings are not even.  2. For new bulbs, the colors may be slightly different for first few hours of burning. The colors will adjust slightly after the first few hours of operation.
 
One or both bulbs will not light or bulbs turn off after the vehicle is started:
 
HID system requires a steady level of battery voltage of at least 12Volts in order for the ballasts to start up. The "Auto Headlight Switch-On" and Daytime Running Light function draws excessive power from the vehicle battery.  This can cause the HID system to not switch on.
 
If you have Daytime Running Lights, try disconnecting the fuse or wiring of Daytime Running Lights only.
 
If you have "Auto Switch-On" Headlight function (Automatic Daylight Sensor), set the switch function to "Manual Switch-On" headlight mode.
 
Never switch on the HID system until after the motor is running.
 
If these do not remedy the problem, you may need to install an HID Relay Harness to resolve this problem.