How to Install a Dashcam in a Bus: Position, Power, Calibration and Checks

Where to mount a dashcam in a bus, how it is powered and calibrated, and what to check before the bus goes back on the road. A step-by-step guide.

Short answer: a bus dashcam is mounted high at the centre of the windshield, wired to vehicle power so it starts with the ignition, calibrated so the AI knows the camera’s height and angle, and then tested for video, GPS, alerts and upload before the bus returns to service.

Where should a dashcam be mounted in a bus?

High on the windshield, on the vehicle’s centre line, inside the area swept by the wipers. This position gives the road lens a level view of the lanes ahead and gives the cabin lens a clear view of the driver. On a bus the windshield is tall and nearly vertical, so the mounting angle is set during installation rather than assumed.

• Keep the road lens clear of tinted bands, stickers and destination boards.
• Make sure the cabin lens can see the driver’s face with the sun visor down.
• Do not block the driver’s view of the road or mirrors.

How is a bus dashcam powered?

It is wired into the vehicle’s electrical system, not plugged into a socket. The installer takes a permanent supply, an ignition-switched supply and an earth, with a fuse on the supply. This lets the dashcam start with the ignition and shut down cleanly after it. Most buses run on a 24 V system, so the dashcam and its power cable must be rated for that.

What are the installation steps?

1. Survey the vehicle. Check the windshield, the fuse box location and the cable route.
2. Fit the bracket. Clean the glass and fix the mount on the centre line.
3. Route the cable. Run it along the headliner and pillar to the fuse box, secured away from moving parts.
4. Connect power. Permanent, ignition and earth, through a fuse.
5. Insert the SIM and memory cards. The cards are formatted in the device.
6. Fit any add-on cameras for blind spots, the gangway or reversing, and connect them to the dashcam.
7. Calibrate. Enter the camera height and vehicle width, and align the road lens to the horizon.
8. Aim the cabin lens at the driver’s normal seating position.
9. Register the device to the vehicle on the fleet dashboard.
10. Test. Run the checks below.

Why does calibration matter?

ADAS estimates the distance to the vehicle ahead and the position of lane markings from the camera image. To do that it must know how high the camera sits and where it is pointing. A dashcam that is not calibrated gives early, late or false alerts, and drivers quickly learn to ignore it. Recalibrate after a windshield replacement or if the unit is moved.

What should you check before the bus leaves?

• Both lenses show a clear, level picture on the dashboard.
• The GPS position is correct.
• The device shows online over 4G.
• Both memory cards are recording.
• The voice alert is audible from the driver’s seat with the engine running.
• A test event reaches the dashboard with its video clip.
• The SOS button, if fitted, raises an alarm.

How long does installation take?

It depends on the bus and on how many extra cameras are fitted. A single windshield dashcam is a short job. Blind-spot, gangway and reversing cameras add cable runs through the body and take longer. Plan installations at the depot between duties so that buses are not taken off service.

Should you install it yourself?

For a fleet, use trained installers. Wiring a 24 V commercial vehicle and calibrating ADAS are not do-it-yourself tasks, and a poor installation is the most common reason for unreliable alerts.

AirFi installs and calibrates every AI dashcam it supplies. Contact us to schedule installation for your fleet.

Frequently asked questions

Related solutions

• AI dashcam for buses and commercial vehicles
• ADAS: advanced driver assistance for buses and trucks