What fuse supplies constant power to the rear defrost circuit?

Fuse M, a 30A fuse in the engine compartment fuse box, is hot at all times and feeds pin 2 of the control through a yellow (Y) wire.

What wire color runs from the defrost control to the rear window defrost grid?

A BR/LB (brown/light blue) wire runs from pin 1 of the rear window defrost control to the rear window defrost grid.

What components are inside the rear window defrost control module?

The module contains a momentary on/off switch, a timing circuit, a defrost relay, switch illumination, and a rear defrost indicator lamp.

How is the defrost circuit grounded?

Pin 4 of the rear window defrost control grounds through a BK (black) wire, and the rear window defrost grid also grounds through a BK wire.

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1992 Ford Bronco Rear Window Defrost Wiring Diagram - Tailgate Defroster Circuit

Rear window defrost control wiring diagram with color-coded wires

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Wiring diagram of the rear window defrost control showing fuse panel, timing circuit, relay and grid with color-coded wires.

AI caption October 2005 · Photo 150 of 277

This document is a color wiring diagram for the rear window (tailgate) defrost circuit, uploaded for a 1992 Ford Bronco. It shows power feeds from two sources: fuse 7 (15A) in the interior fuse panel, which is hot in run and feeds pin 3 of the rear window defrost control via an orange/yellow (O/Y) wire, and fuse M (30A) in the engine compartment fuse box, hot at all times, feeding pin 2 via a yellow (Y) wire. The rear window defrost control module contains a momentary on/off switch, a timing circuit, a defrost relay, a switch illumination lamp, and a rear defrost indicator lamp. Pin 5 receives a light blue/red (LB/R) instrument illumination feed, and pin 4 grounds through a black (BK) wire. Output pin 1 carries a brown/light blue (BR/LB) wire to the rear window defrost grid, which is grounded via a black (BK) wire. A reader can learn the fuse locations and amperages, wire color codes, control module pinout, and internal component layout needed to diagnose a non-working tailgate window defroster.

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Frequently asked questions

Which fuse powers the rear window defrost control in run?: Fuse 7, a 15A fuse in the fuse panel, is hot in run and feeds pin 3 of the rear window defrost control through an O/Y (orange/yellow) wire.
What fuse supplies constant power to the rear defrost circuit?: Fuse M, a 30A fuse in the engine compartment fuse box, is hot at all times and feeds pin 2 of the control through a yellow (Y) wire.
What wire color runs from the defrost control to the rear window defrost grid?: A BR/LB (brown/light blue) wire runs from pin 1 of the rear window defrost control to the rear window defrost grid.
What components are inside the rear window defrost control module?: The module contains a momentary on/off switch, a timing circuit, a defrost relay, switch illumination, and a rear defrost indicator lamp.
How is the defrost circuit grounded?: Pin 4 of the rear window defrost control grounds through a BK (black) wire, and the rear window defrost grid also grounds through a BK wire.