Metra 70-8112 Amplifier Integration Harness for Select Toyota and Lexus 1989-2007

Metra 70-8112 Amplifier Integration Harness for Select Toyota and Lexus 1989-2007

Factory amplifier integration wiring harness engineered for select Toyota and Lexus models from 1989 to 2007, enabling fast and clean aftermarket radio installation without cutting factory radio connectors.

Product Overview

The Metra 70-8112 is a vehicle-specific factory amplifier integration harness designed to simplify aftermarket radio installation in select Toyota and Lexus models equipped with a factory amplified audio system. When installing an aftermarket head unit in these vehicles, the factory amplifier and speaker wiring must be correctly interfaced to avoid signal loss or speaker damage. The 70-8112 addresses this by providing a direct plug-and-play connection to the vehicle's original radio connectors on one side, with colour-coded wiring on the other for straightforward connection or soldering to the aftermarket radio.

The harness includes one 8-pin power plug and one 8-pin speaker plug, and is designed for use with aftermarket radios rated at 35 watts or less. No wire cutting is required at the factory radio connectors, preserving the integrity of the original vehicle harness and allowing the factory radio to be reinstalled if needed. This is a replacement for the PAC TWH14 harness and serves the same vehicle applications.

Please note that additional accessories may be required to complete the installation, including a dash kit, antenna adapter, and a steering wheel control interface depending on your vehicle's factory equipment.

Features & Benefits

Factory Amplifier Integration Correctly interfaces the factory amplified audio system with an aftermarket head unit, ensuring clean signal routing to the factory amplifier and speakers without modification to the original wiring.

Plug-and-Play Factory Connector Connects directly to the vehicle's original radio connectors with no wire cutting required at the factory side, preserving the factory harness and allowing reinstallation of the original radio at any time.

Colour-Coded Wiring for Aftermarket Radio The aftermarket-facing side of the harness features colour-coded wires for straightforward connection or soldering to the new head unit, reducing installation time and minimising wiring errors.

Designed for Radios 35 Watts or Less Compatible with aftermarket radios rated at 35 watts or less per channel. Confirm your chosen head unit's output rating before purchasing.

Replaces PAC TWH14 The Metra 70-8112 is a direct replacement for the PAC TWH14 harness and serves the same Toyota and Lexus vehicle applications.

Metra Quality Metra Electronics is a globally recognised manufacturer of vehicle-specific installation accessories, trusted by professional installers for accurate fitment and reliable electrical performance.

Technical Specs

Compatible With / Goes Well With

The Metra 70-8112 is compatible with the following vehicles:

Goes Well With:

• Aftermarket headunit antenna adapter for Toyota/Lexus models listed above
• Factory steering wheel control interface for Toyota/Lexus models listed above
• Dash kit/fascia for Toyota/Lexus models listed above
• Aftermarket head unit rated 35 watts or less per channel

Frequently Asked Questions

What does a factory amplifier integration harness do?

Vehicles fitted with a factory amplified audio system route the head unit's audio output through a factory amplifier before reaching the speakers. When replacing the head unit, this signal path must be maintained correctly or the factory amplifier and speakers will not function. The 70-8112 provides the correct wiring interface between the aftermarket head unit and the factory amplifier, ensuring proper signal routing without modifying the original harness.

Is the Metra 70-8112 a direct replacement for the PAC TWH14?

Yes. The Metra 70-8112 is a direct replacement for the PAC TWH14 and serves the same Toyota and Lexus vehicle applications. Either part can be used for these installations.

Does the 70-8112 require any wire cutting?

No wire cutting is required at the factory radio connector side. The harness plugs directly into the vehicle's original connectors. The aftermarket-facing side features colour-coded wires that are connected or soldered to the aftermarket radio, which is standard practice for head unit installations.

What is the maximum radio output rating for this harness?

The Metra 70-8112 is designed for aftermarket radios rated at 35 watts or less per channel. Using the harness with a higher-output radio may result in damage to the factory amplifier or speakers. Always confirm your head unit's output rating before purchasing.

Will I need any other accessories to complete my head unit installation?

The 70-8112 covers the amplifier integration wiring only. A complete installation will typically also require a dash kit, antenna adapter, and a steering wheel control interface depending on your vehicle's factory equipment. Check the application guide for your specific model and consult a qualified car audio installer to identify all required accessories.