Automotive / Towing Accessories
Service Instructions for Toyota 10H Trailer Towing Wire Harness Converter
Official service instructions for the Toyota 10H Special Service Campaign, covering the replacement of the trailer towing wire harness converter on 1999-2000 Tacoma vehicles. Includes eligibility verification, parts list, and installation...
Table of contents
Quick guide from the manual
This document outlines the procedure for the Special Service Campaign 10H, which involves replacing the trailer towing wire harness converter on specific Toyota Tacoma vehicles. The general operation flow is as follows:
- Verify Eligibility: Check the VIN range, verify if the vehicle has a Toyota Trailer Towing Hitch installed, and confirm if the affected Toyota Trailer Towing Wire Harness Converter is present.
- Replacement: Perform the replacement as outlined in the specific service procedure.
- Functional Check: Conduct a functional check of the new converter. If the check fails (NG), perform repairs as needed.
- Completion: File the SSC claim, affix the SSC Completion Label, and return the vehicle to the customer.
Vehicle Eligibility and VIN Range
Only vehicles equipped with a Toyota Trailer Towing Wire Harness Converter are affected. Always verify eligibility through TDN/TIS prior to performing repairs. The campaign applies to 1999 and 2000 model year Toyota Tacoma vehicles. Please refer to the VIN range table in the full document to confirm if a specific vehicle is included in this campaign based on its VDS and VIN sequence.
Preparation and Parts
To perform the replacement, ensure you have the following:
- Parts: Trailer Harness Kit (Part Number: 08921-04850). The kit includes the converter, wire harness, sub-wire harness, plastic ties, packing materials, and an insulator block.
- Tools: Standard hand tools are required for the installation.
Components and Installation
The trailer towing wire harness converter is located at the rear of the vehicle, typically mounted near the trailer hitch assembly. Ensure all connections are secure and the harness is routed correctly using the provided plastic ties and packing materials to prevent damage or interference.
Manufacturer information
Toyota Motor Corporation
Practical help
Common problems
Vehicle eligibility unclear
Verify the VIN range against the provided table and check the TDN/TIS system before starting.
Functional check fails after replacement
If the functional check results in 'NG' (Not Good), perform necessary repairs to the wiring or connections.
Before use
- Verify VIN range against the provided table
- Check for the presence of a Toyota Trailer Towing Hitch
- Confirm the affected Toyota Trailer Towing Wire Harness Converter is installed
- Ensure standard hand tools are available
- Verify eligibility through TDN/TIS
Images and diagrams
- The converter is located at the rear of the vehicle, near the trailer hitch assembly.
Model compatibility
- Applicable only to 1999-2000 Toyota Tacoma models.
- Only vehicles equipped with a Toyota Trailer Towing Wire Harness Converter are affected.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.