Harness assessment cheat sheet

Harness Assessment Cheat Sheet

April 2022

Table of Contents

Warnings and Considerations        3

Introduction        3

Vehicle Assessment Instructions        3

Vehicle Type Overview        4

Light-Duty Vehicles        4

Heavy-Duty Trucks        4

GO RUGGED        4

Diagnostic Ports        5

VIN Decoding        5

Harness Estimates        5

Compatibility Tables        5

Light-Duty        5

Electric Vehicles        8

Heavy-Duty        9

Equipment & Off-Road Assets        12

Specialty Vehicles        13

Engine Control Module (ECM) and Non-Engine Control Module        14

Intelligent ECM (Engine Control Module)        14

NON-ECM        14

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: For heavy-duty trucks, always use a vehicle-specific harness when offered by Geotab or the vehicle manufacturer (see Harness Identification and Application [PUB] 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: 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, follow the steps below:

  1. Request a complete vehicle list from the customer, which includes:
  • VIN
  • Manufacturer
  • Model
  • Year
  1. 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.
  1. 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.

guide-to-geotab-harnesses-obd-diagram.png

✱ 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:

  • International
  • Freightliner
  • Peterbilt
  • Kenworth
  • Sterling
  • Mack
  • Volvo
  • Isuzu
  • Mitsubishi (Fuso)

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. For further information to compare and contrast OBDII and RP1226, please visit the following link: https://gtb.page.link/hKF7.

The websites below can assist in finding the diagnostic port in your vehicle.

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: 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 table provides information regarding the Light-Duty vehicle type.

Make

Model

Year

Straight Harness

T-Harness

Notes

All

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

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

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.

GM/Chevy

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

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

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.

Requires HRN-CM24Y1 (from Geotab) and FMS kit (CAN converter) #8983519390, which if not ordered at time of manufacture must be ordered and activated through an Isuzu dealer.

Mercedes-Benz

Mercedes

All

1997+

HRN-BS16S4 or HRN-BS16S4F

HRN-GS16K2

Mercedes

Sprinter

2019+

HRN-CP04A2 + HRN-CM24Y1 (for PSM connection)

907 & 910 chassis only.

Hino

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.

Mitsubishi

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

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 table provides information regarding the Electric vehicle type.

✱ 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.

Make

Model

Year

Straight Harness

T-Harness

Notes

Tesla

Tesla

Model S/X

2015 or older

HRN-CT06S1

N/A

Please check the diagnostic connector of any MY2015 Model S prior to purchasing the harness.

Tesla

Model S/X

2016 or newer

HRN-CT06S2

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.

BYD

BYD

All Bus Models

All

 HRN-BS16S4

 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.

Heavy-Duty

The following table provides information regarding the Heavy-Duty vehicle type.

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

International

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

Peterbilt

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.

  Kenworth

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.

Freightliner

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.

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.

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.

Installation Instructions

Volvo

All models

2019-2021

HRN-CM24Y1 + HRN-CE10K2

Installation Instructions

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.

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.

Volkswagen

All heavy duty trucks

HRN-CG04T3

It is a proprietary FMS connection for VW heavy Duty trucks

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.

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

2006-2018 Mack Install Guide

Mack

Models: GR, AN & PI

2019

N/A

HRN-CM24Y1 + HRN-CE10K2

Installation Instructions

Mack

All models

2019-2021

HRN-CM24Y1 + HRN-CE10K2

Installation Instructions

Sterling

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

Autocar

Autocar

All

HRN-DS09S4

HRN-GS09K2

Western Star

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 table provides 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

Specialty Vehicles

The following table provides information regarding specialty vehicles.

Make

Model

Year

Straight harness

T-harness

Notes

Fire Trucks

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.

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