Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISBODY AND FRAMEFRAMETECHNICAL SERVICE BULLETINSTRAILER HARNESS - UPDATED DESIGN/DIAGNOSTICS
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Trailer Harness - Updated Design/Diagnostics
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Trailer Harness - Updated Design/Diagnostics
ACCESSORIES
AX006-02
October 18, 2002
Title:
TRAILER WIRE HARNESS
Models:
4Runner, Highlander, land Cruiser, RAV4, Sienna, Tacoma & Tundra
Introduction
Beginning in 2000, the accessory trailer wire harness supplier was changed and a new design was adopted which incorporated in-line fuses in the tow wire harness in addition to the vehicle fuse. This bulletin identifies the fuse location to supplement dealer diagnostics troubleshooting. In the future please reference the accessory trailer wire harness Owner's Guide for the vehicle specific diagnostic procedures. As a general note please place the towing wire harness Owner's Guide in glove box after every DIO installation.
Applicable Vehicles
^ 4Runner, Highlander, Land Cruiser, RAV4, Sienna, Tacoma, and Tundra vehicles using the Accessory Towing Receiver Hitch and factory Towing Receiver Hitch option. (See table below for applicable model years.)
Accessory Wire Harness Kit Information
Warranty Information
Wire Harness Fuse Location
Troubleshooting Procedure
Perform the procedure shown if there is any lamp malfunction.
AX006-02
October 18, 2002
Title:
TRAILER WIRE HARNESS
Models:
4Runner, Highlander, land Cruiser, RAV4, Sienna, Tacoma & Tundra
Introduction
Beginning in 2000, the accessory trailer wire harness supplier was changed and a new design was adopted which incorporated in-line fuses in the tow wire harness in addition to the vehicle fuse. This bulletin identifies the fuse location to supplement dealer diagnostics troubleshooting. In the future please reference the accessory trailer wire harness Owner's Guide for the vehicle specific diagnostic procedures. As a general note please place the towing wire harness Owner's Guide in glove box after every DIO installation.
Applicable Vehicles
^ 4Runner, Highlander, Land Cruiser, RAV4, Sienna, Tacoma, and Tundra vehicles using the Accessory Towing Receiver Hitch and factory Towing Receiver Hitch option. (See table below for applicable model years.)
Accessory Wire Harness Kit Information
Warranty Information
Wire Harness Fuse Location
Troubleshooting Procedure
Perform the procedure shown if there is any lamp malfunction.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.