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This article explains what the LEDs mean on the OBDLink® Bluetooth MX+, CX, and LX adapters. 

MX+ adapter

When you install your MX+ adapter for the first time, all the LEDs flash in a green-red-yellow-blue pattern.

1. POWER 
   • LED is on when the adapter is booted up and ready. 
   • LED flashes green every few seconds when the adapter is plugged in and the engine is off (sleep mode).

     Note: OBDLink adapters use BatterySaver™ Technology low power mode, so they will not drain your vehicle battery and are safe to leave installed.

   • LED flashes green and turns solid during the factory reset procedure.

2. OBD

   • LED flashes red when the adapter is paired and data is traveling between the adapter and your phone/tablet.

   • LED is off when the adapter is plugged in and the engine is off (sleep mode).

   • Contact technical support if you are having problems and you see the OBD and HOST LEDs blinking in an alternating red and yellow pattern. 

3. HOST

   • LED flashes yellow when the adapter is paired and data is traveling between the adapter and your phone/tablet.

   • LED is off when the adapter is plugged in and the engine is off (sleep mode).

   • Contact technical support if you are having problems and you see the OBD and HOST LEDs blinking in an alternating red and yellow pattern.

4. BT

   • LED flashes blue rapidly when ready to pair with a Bluetooth device.

   • LED is on when the adapter is paired to your phone/tablet.

   • LED flashes blue slowly when the adapter is not in pairing mode.

   • LED is off when the adapter is plugged in and the engine is off (sleep mode).

5. Pair button

   • Press the button to pair the adapter with your phone/tablet using Bluetooth.

   • To restore to factory settings, press and hold the button for 15 seconds.

CX adapter

When you install your CX adapter for the first time, all the LEDs flash in a green-red-blue pattern.

1. PWR
   • LED is on when the adapter is booted up and ready. 
   • LED flashes green every few seconds when the adapter is plugged in and the engine is off (sleep mode).
     Note: OBDLink adapters use BatterySaver™ Technology low power mode, so they will not drain your vehicle battery and are safe to leave installed.
2. OBD
   • LED flashes red when the adapter is paired and data is traveling between the adapter and your phone/tablet.
   • LED is off when the adapter is plugged in and the engine is off (sleep mode).
   • Contact technical support if you are having problems and you see the OBD and PWR LEDs blinking in an alternating red and green pattern. 
3. BLE
   • LED flashes blue rapidly when ready to pair with a Bluetooth Low Energy (BLE) device.
   • LED is on when the adapter is paired to your phone/tablet.
   • LED flashes blue slowly when the adapter is not in pairing mode.
   • LED is off when the adapter is plugged in and the engine is off (sleep mode). 

LX adapter

When you install your LX adapter for the first time, all the LEDs flash in a green-red-yellow-blue pattern.

1. POWER 
   • LED is on when the adapter is booted up and ready. 
   • LED flashes green every few seconds when the adapter is plugged in and the engine is off (sleep mode).
     Note: OBDLink adapters use BatterySaver™ Technology low power mode, so they will not drain your vehicle battery and are safe to leave installed.
   • LED flashes green and turns solid during the factory reset procedure.
2. OBD 
   • LED flashes red when the adapter is paired and data is traveling between the adapter and your phone/tablet.
   • LED is off when the adapter is plugged in and the engine is off (sleep mode).
   • Contact technical support if you are having problems and you see the OBD and HOST LEDs blinking in an alternating red and yellow pattern. 
3. HOST 
   • LED flashes yellow when the adapter is paired and data is traveling between the adapter and your phone/tablet.
   • LED is off when the adapter is plugged in and the engine is off (sleep mode).
   • Contact technical support if you are having problems and you see the OBD and HOST LEDs blinking in an alternating red and yellow pattern. 
4. BT 
   • LED flashes blue rapidly when ready to pair with a Bluetooth device.
   • LED is on when the adapter is paired to your phone/tablet.
   • LED flashes blue slowly when the adapter is not in pairing mode.
   • LED is off when the adapter is plugged in and the engine is off (sleep mode).
5. Pair button
   • Press the button to pair the adapter with your phone/tablet using Bluetooth.
   • To restore to factory settings, press and hold the button for 15 seconds.

Learn more

• If you have wireless issues connecting your OBDLink® MX+ or OBDLink LX adapter to your phone or tablet, see the Restore OBDLink® Bluetooth Adapter to Factory Settings article.
• For descriptions of terms used in this article, see the Glossary of Acronyms and Terms.

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