Question 1

How do I turn on the BDI-747 device?

Accepted Answer

Turn the ignition key to the ON position (do not start the vehicle), then press and hold the middle button until the right light turns blue and stays on.

Question 2

How do I start my vehicle with the BDI-747?

Accepted Answer

After turning the device on, wait until the screen says “Test required, Please Provide Breath Sample.” Insert the mouthpiece, take a deep breath, and blow steadily until you hear a click.

Question 3

What does “LINK ON” mean?

Accepted Answer

“LINK ON” confirms that the handset is properly connected to the vehicle system. If it does not appear, turn the key OFF, then back to ON.

Question 4

How long do I have to start my vehicle after passing a test?

Accepted Answer

You have 2 minutes to start your vehicle after receiving a “Test Passed” message.

Question 5

Can I disconnect the handset?

Accepted Answer

Yes. It is recommended to remove the handset when exiting the vehicle to reduce warm-up time and prevent theft. Always wait until the device powers down first.

Question 6

What happens if I don’t blow hard enough?

Accepted Answer

The device may display “Blow test error, Please try again.” This means the breath sample was not strong or long enough. You may try again immediately.

Question 7

What happens if I fail a breath test?

Accepted Answer

If the screen shows “Test Failed,” the system will reset and allow additional attempts based on your state’s rules. Too many failed attempts may result in a temporary lockout.

Question 8

What are rolling retests?

Accepted Answer

Rolling retests are random breath tests required while driving. The device will beep and display a countdown timer prompting you to provide another breath sample.

Question 9

Will the device shut off my vehicle if I miss a rolling retest?

Accepted Answer

No. The BDI-747 will not turn off your vehicle, but the horn may sound and headlights may flash until the vehicle is stopped.

Question 10

What should I do when a rolling retest is requested?

Accepted Answer

It is recommended that you safely pull over, complete the test, and then continue driving.

Question 11

Can I eat or use mouthwash before a breath test?

Accepted Answer

Wait at least 15 minutes after eating or using products containing alcohol (such as mouthwash) before testing.

Question 12

How do I know when my next service appointment is?

Accepted Answer

The device displays your next service date every time it prepares for a test.

Question 13

What happens if I miss a service appointment?

Accepted Answer

Missing service may cause the device to enter stop service mode, which will prevent you from starting your vehicle.

Question 14

What events can cause a violation?

Accepted Answer

Violations may occur if:
• You fail twice at start-up within 4 hours.
• You fail during a rolling retest.
• You miss a rolling retest.
• Power to the device is interrupted by disconnecting the battery.

Question 15

What is an early service recall?

Accepted Answer

An early service recall requires you to have the device serviced within 5 days to avoid a lockout.

Customer Support

Training Videos

WC9000+ Training Video (English)

Video de Entrenamiento WC9000+ (Español)

Device Manuals

BDI-747 Manual

BDI-747 Manual del Usuario

Customer Support FAQs for Ignition Interlock Devices

Getting Started & Daily Use

Breath Tests & Retests

Service, Lockouts & Violations

Let’s Talk

Ready to take the next step?