Harness assessment cheat sheet
Harness Assessment Cheat Sheet
September 2022
Warnings and Considerations
WARNING! Use Geotab telematics devices only with Geotab-approved harnesses acquired from Geotab-authorized channels. Use of non-Geotab harnesses from unauthorized channels can cause serious safety risks, including fire, and can lead to serious personal injury and/or damage to the vehicle. |
! IMPORTANT:Â For heavy-duty trucks, always use a vehicle-specific harness when offered by Geotab or the vehicle manufacturer (see Harness Identification and Application [PUB]Â and this document). Where a heavy-duty truck-specific harness is not offered by Geotab or the vehicle manufacturer, use the adapter harness (HRN-CG13S1) for any 16-pin (OBDII) installation method to avoid possible GO device damage. |
! IMPORTANT:Â The State of California currently prohibits Installing HRN-GS16K2, HRN-GS09K2, HRN-GR09K1, and HRN-BD16S5 in a manner that relocates the in-vehicle diagnostic connector. The following documents provide guidance on installing harnesses using a direct plugin installation method without relocating the data link connector:
Alternatively, GO devices can be installed directly into the OBDII port using an extension/conversion harness that plugs directly into the OBDII port or other emissions diagnostic data link connector port. For more information on Geotab harnesses and adapters, see Harness Identification and Application. |
Introduction
For many vehicles, the installation of a GO device requires an intermediary harness cable. The purpose of this document is to help you identify which harness cables are required for installation based on vehicle make, model, and year, as described in the Compatibility Tables.
Once you know which harnesses are required for your customer’s installation needs, the harnesses can be ordered in MyAdmin, and you can refer to the related Harness Identification and Application document for more detailed information about each harness.
Vehicle Assessment Instructions
To complete a vehicle assessment, do the following:
- Request a complete vehicle list from the customer, which includes:
- VIN
- Manufacturer
- Model
- Year
- Use the Harness Lookup Excel template to prepare a list of vehicles for harness assessment:
- Ensure that there is no missing information or incomplete entries.
- Normalize the manufacturer and model names (for example, ensure all variations of model names, such as F-150 and F150, are entered in the same way).
- Use the Summary tab to get counts of each vehicle type.
- Use the Compatibility Tables to determine which harnesses are required for each vehicle.
Vehicle Type Overview
Light-Duty Vehicles
All light-duty vehicles made since 1997 have a 16-pin OBDII port. They are able to use the standard HRN-BS16S4 harness, the HRN-BS16S4F harness, or the HRN-GS16K2 universal T-Harness. Review the Compatibility Tables for any exceptions.
✱ NOTE: A standard GO9 device is also a 16-Pin Port, so a harness may not be required. |
Heavy-Duty Trucks
Listed below are a number of common heavy-duty truck manufacturers:
- Autocar
- Freightliner
- International
- Isuzu
- Kenworth
- Mack
- Peterbilt
- Sterling
- Volkswagen
- Volvo
- Western Star
GO RUGGED
GO RUGGED requires specific harnesses for installation. For more detailed information about installation and harness types, please see the Vehicle Specific Installation Notes and the Harness Identification and Application document.
Diagnostic Ports
! IMPORTANT: OBDII and RP1226 diagnostic ports are supported. Refer to OBD vs. RP1226 Connector - Compare and Contrast for more information. |
The websites below can assist in finding the diagnostic port in your vehicle.
- Wiki OBD — Europe, Latam, Asia, Africa and Australia
- Innova DLC — North America only
- CarMD — North America only
- The Diagnostic Box — North America & Europe
- Outils OBD Facile — North America & Europe
VIN Decoding
If you only have access to a VIN, there are various online decoding sites that can retrieve the Make, Model and Year of a vehicle based on its VIN.
Harness Estimates
! IMPORTANT:Â Geotab does not guarantee that the following suggestions are 100% accurate. They are best guesses and are considered to be estimates based on experience. |
Compatibility Tables
Light-Duty
The following tables provide information regarding the Light-Duty vehicle type.
All Makes / Models
Make | Model | Year | Straight Harness | T-Harness | Notes |
All | All | <1996 | HRN-CW03K3 | Any vehicle without a diagnostic port. | |
All light duty | All | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Applies to all light duty makes and models. See exceptions below. |
Ford
Make | Model | Year | Straight Harness | T-Harness | Notes |
Ford | F150–F550 | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | |
Ford | F650+ | 1997+ | HRN-DS09S4 | HRN-GS09K2 | Please confirm the diagnostic port to ensure it is 9-pin prior to purchasing a 9-pin harness. Purchase HRN-GS16K2 for 16-pin OBDII. F650+ trucks can have either a gas (Ford) or diesel (Cummins or Cat) Engine. Ford trucks with gas engines send the majority of data via 16-pin OBDII, however some data may be sent via 9-pin (brake/ABS). Ford trucks with Diesel engines send the majority of data via 9-pin, however some data may be sent via 16-pin (odometer/seatbelt). |
Ford | Fiesta | 1997+ | Must use T-harness | HRN-GS16K2 | Must use T-harness due to the location of the diagnostic port. The 2017+ Mk7 models can be directly plugged into the diagnostic port. |
Ford | Fusion | 1997+ | Must use T-harness | HRN-GS16K2 | Must use T-harness due to the location of the diagnostic port. |
Dodge
Make | Model | Year | Straight Harness | T-Harness | Notes |
Dodge | All | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
General Motors (GM) / Chevrolet / GMC
Make | Model | Year | Straight Harness | T-Harness | Notes |
GM/Chevy | All light-duty GM/Chevy cars/trucks (e.g. Cruze, Malibu, Silverado, Sierra, etc.) | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
Chevrolet | C4–C7 & T6–T8 Series | 2006–2009 | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
GMC | C4–C8 & T6–T8 Series | 2006–2009 | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
Nissan
Make | Model | Year | Straight Harness | T-Harness | Notes |
Nissan | Frontier | 1997+ | Must use T-harness | HRN-GS16K2 | Must use T-harness due to the location of the diagnostic port. |
Nissan | UD | 2009 | HRN-DS09S4 | HRN-GS09K2 | ! IMPORTANT: The vehicle has two diagnostic ports — do not connect to the OBDII port. |
Isuzu
Make | Model | Year | Straight Harness | T-Harness | Notes |
Isuzu | All | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
Isuzu | Diesel Vehicles | 2017+ | N/A | HRN-CM24Y1 + HRN-CI04A2 | The optional Isuzu FMS port provides features required for ELD solutions, such as odometer, which are not provided by HRN-GS16K2. |
Hino
Make | Model | Year | Straight Harness | T-Harness | Notes |
Hino | All | 1997-2011 | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | The vehicle has two diagnostic ports. Data typically comes through the 16-pin but in some cases the 9-pin. |
Hino | 200-500 Series | 2012-2018 | HRN-CM24Y1 + HRN-CH06A2 | Special adapter HRN-CH06A2 harness required. | |
Hino | 100 Series | 2012-2018 | HRN-CM24Y1 + HRN-CH10A2 | Special adapter HRN-CH10A2 harness required. | |
Hino | All | 2019-2020 | HRN-CM24Y1 + HRN-CH10A2 | Special adapter HRN-CH10A2 harness required. |
Mercedes-Benz
Make | Model | Year | Straight Harness | T-Harness | Notes |
Mercedes | All | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | |
Mercedes | Sprinter | 2019+ | HRN-CP04A2 + HRN-CM24Y1 (for PSM connection) | 907 & 910 chassis only. |
Mitsubishi
Make | Model | Year | Straight Harness | T-Harness | Notes |
Mitsubishi | All Light Duty | 1997+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
Mitsubishi Fuso | All | <2009 | HRN-CW03K3 | N/A | Please use HRN-CW03K3 unless confirmed diagnostic port with Auxiliary port. If an Auxiliary port is present, use HRN-BU16Y5. |
Mitsubishi Fuso | All | 2010+ | HRN-BU16Y5 | N/A | Must use HRN-BU16Y5. May require HRN-CW03K3 if no Auxiliary port is available. |
Workhorse Chassis
Make | Model | Year | Straight Harness | T-Harness | Notes |
Workhorse Chassis | All | 1999+ | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 | Please confirm that the diagnostic port is a 16-pin OBDII before ordering the harness. |
Electric Vehicles
The following tables provide information regarding the Electric vehicle type.
BYD
Make | Model | Year | Straight Harness | T-Harness | Notes |
BYD | All Bus Models | All | Â HRN-BS16S4 | Â HRN-GS16K2 | Only applicable for BYD buses made in North America. For BYD buses made outside North America, please work with your Geotab Solutions Engineering team member and BYD person of contact to determine the appropriate harness to use. |
✱ NOTE: All BYD trucks made in North America require a proprietary harness, which Geotab does not make in-house. For BYD vehicles outside North America please work with your regional Solutions Engineering rep, the EV team, and your BYD point of contact to determine the appropriate harness to use. |
Tesla
Make | Model | Year | Straight Harness | T-Harness | Notes |
Tesla | Model S | September 16, 2015 or older | HRN-CT06S2 | N/A | Please check the diagnostic connector of any MY2015 Model S prior to purchasing the harness. |
Tesla | Model S/X | September 17, 2015 or newer | HRN-CT06S1 | N/A | Please check the diagnostic connector of any MY2015 Model S prior to purchasing the harness. |
Tesla | Model 3 | 2018 | N/A | HRN-CT20T1 | The diagnostics port can be found in the rear behind the lower center console panel. |
Tesla | Model 3 | 2019+ | N/A | HRN-CT20T11 | The diagnostics port can be found in the rear behind the lower center console panel. |
Tesla | Model Y | 2019+ | N/A | HRN-CT26T1 | The diagnostics port can be found in the rear behind the lower center console panel. |
Heavy-Duty
The following tables provide information regarding the Heavy-Duty vehicle type.
All Makes / Models
Make | Model | Year | Straight Harness | T-harness | Notes |
All | All | <1996 | HRN-CW03K3 | Any vehicle without a diagnostic port. | |
All Heavy Duty (see list above) | All | 1997–1999 | HRN-DS06S4 | HRN-DS06T2 |
Autocar
Make | Model | Year | Straight Harness | T-harness | Notes |
Autocar | All | HRN-DS09S4 | HRN-GS09K2 |
Freightliner
Make | Model | Year | Straight Harness | T-harness | Notes |
Freightliner | All Medium Duty (i.e. M2 106 Medium Duty) | 2000+ | HRN-DS09S4 | HRN-GS09K2 | |
Freightliner | All Heavy/Super Duty (ie. Cascadia, 114SD, 122SD & 108SD) | 2000–2012 | HRN-DS09S4 | HRN-GS09K2 | |
Freightliner | All Heavy/Super Duty (ie. Cascadia, 114SD, 122SD & 108SD) | 2013+ | Must use T-harness | HRN-GS09K2 | Must use T-harness due to the location of the diagnostic port. |
Freightliner | All models | 2019+ | HRN-CS14S21 | HRN-GS09K2 | If the vehicle is equipped with a 14-pin (RP1226) port, use HRN-CS14S21 as more data is sent through this port. If not, then use HRN-GS09K2. |
International
Make | Model | Year | Straight Harness | T-harness | Notes |
International | 7300–9900 | 2000–2005 | HRN-DS06S4 | HRN-DS06T2 | For MY2005, please check your diagnostic port prior to purchasing the harness. |
International | 7300–9900 | 2006+ | HRN-DS09S4 | HRN-GS09K2 | |
International | 5500i–9900i | 2000–2007 | HRN-DS06S4 | HRN-DS06T2 | Please check your diagnostic port prior to purchasing the harness. |
International | 5500i–9900i | 2008+ | HRN-DS09S4 | HRN-GS09K2 |
Kenworth
Make | Model | Year | Straight Harness | T-harness | Notes |
Kenworth | All | 2000–2016 | HRN-DS09S4 | HRN-GS09K2 | |
Kenworth | All | 2017+ | Must use T-harness | HRN-GS09K2 | To guarantee the operation of the GO device, it is recommended that a GO9 is used exclusively for 2017+ Kenworth. GO7 and GO8 devices may not work correctly with some motors (MX13 and MX15). See Installation Notes for more information. If the vehicle has a Paccar Motors MX13 or MX15 and a GO7 or GO8 is already installed, then the harness HRN-BS04A1 must be used instead. |
Kenworth | All models | 2019+ | HRN-CS14S21 | HRN-CS14T2 | If the vehicle is equipped with a 14-pin (RP1226) port, use this harness as more data is sent through this port. If the vehicle is not equipped with a 14-pin (RP1226) diagnostic connector, use the 9-pin harness HRN-GS09K2 instead. |
Mack
! IMPORTANT: The OBDII port must not be used for 2019+. Always use a vehicle-specific harness when offered by Geotab or the vehicle manufacturer. Where a heavy-duty truck-specific harness is not offered by Geotab or the vehicle manufacturer, use the adapter harness (HRN-CG13S1) for any 16-pin (OBDII) installation method to avoid possible GO device damage. |
Make | Model | Year | Straight Harness | T-harness | Notes |
Mack | All | 2000–2005 | HRN-DS09S4 | HRN-GS09K2 | |
Mack | Cabover models | 2000-2012 | HRN-GS09K2 | ||
Mack | Models: CTP, CXP, CHP, CHU, CXU & GU | 2006-2018 | N/A | HRN-CM24Y1 + HRN-CK10K2 | |
Mack | Models: GR, AN & PI | 2019 | N/A | HRN-CM24Y1 + HRN-CE10K2 | |
Mack | All models | 2019-2023 | HRN-CM24Y1 + HRN-CE10K2 |
Peterbilt
Make | Model | Year | Straight Harness | T-harness | Notes |
Peterbilt | All | 2000–2007 | HRN-DS09S4 | HRN-GS09K2 | Please confirm the diagnostic port, as in some cases the vehicle may have a 6-pin port and will require the HRN-DS06T2. |
 Peterbilt | All | 2008-2018 | N/A | HRN-GS09K2 | To guarantee proper operation of the GO device, it is recommended that a GO9 is used exclusively for 2017+ Peterbilt. GO7 and GO8 devices may not work correctly with some motors (MX13 and MX15). |
Peterbilt | All models | 2019+ | HRN-CS14S21 | HRN-CS14T2 | If the vehicle is not equipped with a 14-pin (RP1226) diagnostic connector, use the 9-pin harness HRN-GS09K2 instead. |
Sterling
Make | Model | Year | Straight Harness | T-harness | Notes |
Sterling | All (except Bullet) | 1997–1999 | HRN-DS06S4 | HRN-DS06T2 | |
Sterling | All (except Bullet) | 2000+ | HRN-DS09S4 | HRN-GS09K2 | |
Sterling | Bullet | 2008-2009 | HRN-BS16S4 or HRN-BS16S4F | HRN-GS16K2 |
Volkswagen
! IMPORTANT: The OBDII port must not be used for Volkswagen trucks. Always use a vehicle-specific harness (HRN-CG04T3) when offered by Geotab or the vehicle manufacturer. If a heavy-duty truck-specific harness is not offered by Geotab or the vehicle manufacturer, use the adapter harness (HRN-CG13S1) for any 16-pin OBDII installation to avoid possible damage to the GO device. |
Make | Model | Year | Straight Harness | T-harness | Notes |
Volkswagen | All heavy duty trucks | HRN-CG04T3 | It is a proprietary FMS connection for VW heavy Duty trucks |
Volvo
! IMPORTANT: The OBDII port must not be used for 2019+. Always use a vehicle-specific harness when offered by Geotab or the vehicle manufacturer. Where a heavy-duty truck-specific harness is not offered by Geotab or the vehicle manufacturer, use the adapter harness (HRN-CG13S1) for any 16-pin (OBDII) installation method to avoid possible GO device damage. |
Make | Model | Year | Straight Harness | T-harness | Notes |
Volvo | All Heavy Duty (ie. VNM, VNL, VNX, VHD, VAH, VNR) | 2000–2003 | HRN-DS09S4 or HRN-DS06S4 | HRN-GS09K2 or HRN-DS06T2 | Please confirm if there is a 6-pin or 9-pin diagnostics port on the truck. |
Volvo | All Heavy Duty (ie. VNM, VNL, VNX, VHD, VAH, VNR) | 2004-2018 | N/A | HRN-CM24Y1 + HRN-CE10K2 | Models from 2004 to 2013 can either use a HRN-GS09K2 or HRN-CM24Y1+HRN-CE10K2. |
Volvo | All models | 2019-2021 | HRN-CM24Y1 + HRN-CE10K2 | ||
Volvo | All models | 2021+ | HRN-CS14S21 | If the vehicle is equipped with a 14-pin (RP1226) port, use this harness as more data is sent through this port. |
Western Star
Make | Model | Year | Straight Harness | T-harness | Notes |
Western Star | All | HRN-CS14S21 | HRN-GS09K2 | If the vehicle is equipped with a 14-pin (RP1226) port, use HRN-CS14S21 as more data is sent through this port. If not, then use HRN-GS09K2. |
Equipment & Off-Road Assets
✱ NOTE: The GO RUGGED is mandatory for these vehicles. |
The following tables provide information regarding Equipment and Off-Road Assets. Generally speaking, assets in this table fall into one of the following categories:
- Equipment with engines that produce less than 25 hp, or equipment without a diagnostics port (meaning they likely do not have ECM capabilities). Such equipment requires a non-ECM type harness (HRN-RW03K4, HRN-RW04S4, HRN-RW03S5).
- Assets that are NOT considered on-highway vehicles, which includes a broad range of applications (agricultural, construction, oil & gas, recreational, etc.).
- You can verify whether an asset is considered on-highway or not by entering its VIN into the following NHTSA VIN decoder: https://vpic.nhtsa.dot.gov/decoder/
- If the asset has a valid 17-character VIN, then it is considered on-highway and the below table does not apply. Otherwise, it is considered off-road, in which case you may refer to the below table to determine which harnesses are required.
Make | Model | Year | Straight harness | T-harness | Notes |
All | All | <1999 | HRN-RW03K4 | Any vehicle without a diagnostic port. | |
All Equipment | All | 2000+ | See Notes | HRN-GR09K1 | General guideline for all yellow iron equipment. Please check the table for specific manufacturers. Check for a diagnostic port. If no port exists, then only the HRN-RW03K4 is required. See exceptions below. |
Caterpillar | All equipment with diagnostic port | 2000–2016 | HRN-GR09K1 + HRN-RMRCA1 | ||
Caterpillar | All equipment with 14-pin Deutsch diagnostic port | 2016+ | HRN-DC14S2 | N/A | |
John Deere | All | 2000+ | HRN-GR09K1 | Please confirm there is a diagnostic port prior to purchasing the harness. If no port exists, HRN-RW03K4 is required. | |
Komatsu | All | 2000-2009 | HRN-GR09K1 | Please confirm there is a diagnostic port prior to purchasing the harness. If no port exists, HRN-RW03K4 is required. | |
Komatsu | All | 2010+ | HRN-RC12T2 | This harness is only compatible with Komatsu tier 4 engines, and is not compatible with tier 3 engines. In addition, please confirm there is a 12-pin diagnostic port prior to purchasing the harness. If no port exists, HRN-RW03K4 is required. | |
Polaris | All equipment with a diagnostic port. In particular, this includes smaller off-road vehicles such as snowmobiles and ATVs. | 2000+ | HRN-RD04S1 | N/A |
Fire Trucks
The following table provides information regarding fire trucks.
Make | Model | Year | Straight harness | T-harness | Notes |
Oshkosh | All | 2008+ | N/A | HRN-GS09K2 | |
Spartan | All | 2008+ | N/A | HRN-GS09K2 | |
E-ONE | All | 2008+ | N/A | HRN-GS09K2 |
Engine Control Module (ECM) and Non-Engine Control Module
✱ NOTE: The GO RUGGED is mandatory for these vehicles. |
Intelligent ECM (Engine Control Module)
The following table provides information regarding the Intelligent ECM.
Harness | Description |
HRN-RZ04S4 | Ford Model type Engine MSG-425. 2.5 liter (Ground Service Equipment). |
HRN-RZ04T4 | Kubota Type Engine MA-40-36 (Ground Service Equipment). |
NON-ECM
The following table provides information regarding the Non-ECM.
Harness | Description |
HRN-RW04S4 | All Equipment with Ground Disconnect on Asset and/or NON-ECM with no true ignition. |
HRN-RW03S5 | NON-ECM with no true ignition using Low Voltage/Primary side of ignition coil. |
