Mastering Geotab
★ Geotab Harnesses · OBD-II Harnesses
The HRN-BU16Y5 is a Geotab OBD-II harness with a second vehicle connector that pulls engine data, VIN and odometer from Mitsubishi Fuso and other medium-duty trucks. Without that second plug, a Fuso install reports far less than it should.
The HRN-BU16Y5 is a 130 cm (51 in) Geotab harness that links a GO device to a Mitsubishi Fuso or similar medium-duty truck through two vehicle connections instead of one. Besides its 16-pin OBD-II side, it carries a dedicated connector that must be mated to the Fuso connector so the device can read engine data.
That second connection is the whole point of the part. Geotab describes it as the route to the VIN and odometer on these trucks. A Fuso that only gets the standard port connection will still show location, but the engine side of the record is where fleets find maintenance timing and mileage for their reports, and that is the side this harness is built to deliver. It replaces the older HRN-EZFUSO in Geotab's lineup.
Geotab's published installation guide for this part covers Mitsubishi Fuso trucks from model years 2010 through 2021, fitted with a GO9. In that guide the HRN-BU16Y5 works alongside the universal 16-pin T-harness HRN-GS16K2: the T-harness goes onto the factory OBD-II port, and the BU16Y5 plugs into the T-harness's open port. Geotab's harness description also mentions medium-duty vehicles beyond Fuso, though it does not publish a model list for them, so for anything other than a Fuso we verify the connector on the actual truck first.
Two other Geotab paths are worth knowing. Its harness cheat sheet routes 1999 to 2009 Fuso trucks to a three-wire install with HRN-CW03K3 on GO9, and it shows a 16-pin T-harness with an IOX-CLAMP as another option for 2010 and newer models. The GO10 uses a different connector from the GO9 family, so a GO10 fleet needs its own harness plan for these trucks, and our technicians settle that before the visit.
A Fuso connected through the OBD-II port alone can leave a fleet with dots on a map and blank engine fields behind them. Adding the HRN-BU16Y5 connection is how that gap gets closed, whether on a new install or on a truck someone else wired earlier.
It also matters for record keeping. Fleets that bill by mileage, schedule oil changes from odometer readings, or reconcile fuel cards against distance need the odometer to come from the truck rather than from GPS estimates. Getting the VIN from the vehicle confirms that each device is tied to the correct asset in MyGeotab.
Geotab's Fuso guide lays out the job clearly, and we follow it with the truck parked and switched off. First, find the OBD-II port in the driver-side footwell, either above the accelerator or in the kick panel. Take the factory port out of its mount, plug the universal T-harness onto it, and plug the HRN-BU16Y5's Connector 1 into the T-harness.
Next, unclip the passenger-side knee panel and route the BU16Y5 across to the floor area beneath the fuse box. Connector 2 mates with the black 2-pin connector near the passenger-side fuse box; this is the engine data link that makes the harness worth fitting. Connector 3 then takes the GO device, which is zip-tied to the cable and to the dash bracket. Geotab flags one detail as important: the GPS antenna sits on the bottom of the device and must point skyward, facing away from the metal of the bracket.
To verify, start the truck and allow up to five minutes for the device to initialize; it beeps during this period. Red, blue and green LEDs confirm ignition, GPS and cellular connection. We then confirm in MyInstall and MyGeotab that the VIN and odometer are coming through before refitting the panels. Geotab's limits apply throughout: keep connected cable at or under 2 m (6.5 ft), and never connect one T-harness to another.
| Spec | Detail |
|---|---|
| Part number | HRN-BU16Y5 |
| Purpose | OBD-II harness with an added connector for Mitsubishi Fuso and medium-duty engine data, VIN and odometer |
| Length | 130 cm (51 in) |
| Replaces | HRN-EZFUSO |
| Paired with (Geotab Fuso guide) | HRN-GS16K2 universal 16-pin T-harness |
| Documented device | GO9, Mitsubishi Fuso model years 2010 to 2021 |
| Max connected cable length | 2 m (6.5 ft) |
| Country of origin | China |
The most common miss is leaving Connector 2 unplugged, which produces a working tracker with thin engine data. Confirm the black 2-pin mate is fully latched, since a half-seated plug near the fuse box can work loose with cab vibration. Keep the device's antenna side clear of the dash bracket metal, and keep the routing away from the fuses so a later fuse change does not mean pulling the harness. If the truck is older than 2010, stop and recheck: Geotab points those years toward a three-wire install instead.
Geotab built it with a dedicated connector for the Fuso engine data link, which is how the GO device captures the VIN and odometer on these trucks.
In Geotab's 2010 to 2021 Fuso guide, Connector 2 goes into the black 2-pin connector near the passenger-side fuse box, reached by removing the passenger knee panel.
It replaces the HRN-EZFUSO in Geotab's harness lineup.
Our team supplies the HRN-BU16Y5, the T-harness and the GO device for Fuso trucks and fits them on site in your yard, then confirms the VIN and odometer are reporting before we pack up. Phone 803-513-1009, or send the truck details through Get a Quote.
Sources: Geotab Harness Identification and Application, Geotab 2010 to 2021 Mitsubishi Fuso GO9 installation guide, Geotab harness cheat sheet. GEOTAB is a registered trademark of Geotab Inc. API Signal is an independent installer and is not Geotab.
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