Rear Window Control Module Relay

For 1984–1989 1st Gen Toyota 4Runner

Overview

Restore reliable rear window operation in your 1st Gen Toyota 4Runner with this reproduction rear window control module relay, engineered as a direct replacement for OEM Toyota part number 85930-89101. Original factory modules are known to fail with age, often causing intermittent operation or complete rear window failure. This modern reproduction eliminates those issues while adding configurable functionality not available from the factory.

Designed as a true plug-and-play solution, this module installs directly into the factory circuit location with no wiring changes or modifications required.

Key Features & Functional Upgrades

• Direct replacement for OEM rear window relay module (Toyota 85930-89101)

• Resolves common OEM failures causing intermittent or non-functional rear windows

• Built with modern, high-quality electronic components for long-term reliability

• Retains critical factory protections including current and voltage limiting

• Designed to outlast original factory modules

Unlike simple bypass harnesses, this module maintains OEM-level safeguards to help protect the rear window motor, glass mechanism, and rear wiper motor from damage.

Configurable DIP Switch Functions

Each module includes three onboard DIP switches, allowing you to customize rear window behavior to suit your needs:

• DIP Switch 1: Enables rear window down operation from the front center console switch with the vehicle turned off

• DIP Switch 2: Enables rear window up operation from the front center console switch with the vehicle turned off

• DIP Switch 3: Bypasses the rear window wiper safety interlock

These options give owners flexibility while still retaining factory electrical protections.

Installation Notes

• Plug-and-play installation using factory wiring

• No cutting, splicing, or permanent modifications

• Fits directly into the original circuit location

Important:
This listing includes the control module circuit only. The factory housing and mounting bracket are not included and must be reused from the original module.

Manufacturing Quality

Designed and manufactured in the USA with attention to electrical reliability and OEM-correct fitment. Built for enthusiasts seeking a dependable, long-term solution rather than a temporary bypass.