SuperMotors SuperMotors SUPERMOTORS Search — try “orange Bronco on 35s”
Home/ Registry/ Toyota/ Sequoia/ 2002 Toyota Sequoia/ Photo supermotors.net/registry/media/791927

Toyota Sequoia 4WD Module Bypass Switch Wiring Diagram - Green & Blue-Red Wires

Hand-drawn wiring diagram showing a double-pole switch, diode, and color-coded wires to a 4WD module and engine ECU.

AI caption · Photo 23 of 29

This is a hand-drawn wiring diagram (pencil sketch) showing a modification to a vehicle's 4WD control wiring using a single throw, double pole (DPST/DPDT-style) toggle switch. The switch receives switched accessory power (ACC 12VDC+) through an inline diode on one pole and chassis GROUND on the other pole. The switch outputs connect to two wires at the 4WD MODULE: the GREEN wire and the BLUE-RED wire. A handwritten note instructs the installer to "CUT GREEN WIRE, CAP OFF OTHER END TO TRANSMISSION," meaning the original green wire running to the transmission is severed and its transmission-side end capped, with the module side of the green wire now fed by the switch. The BLUE-RED wire from the 4WD module continues, through another inline diode, down to the "L4 SHIFTER & ENGINE ECU." The diodes appear intended to isolate the added switch circuit from the factory circuits. The document was uploaded to a 2002 Toyota Sequoia gallery, consistent with the 4WD module, L4 (low-range) shifter, and engine ECU references, though the drawing itself states no year, make, or model. A reader can learn the switch wiring, wire colors involved (green and blue-red), diode placement, and which factory wire must be cut and capped.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What kind of switch does this 4WD wiring modification use?
A single throw, double pole switch. One pole is fed by ACC 12VDC+ (through a diode) and the other pole by ground.
Which factory wire has to be cut in this diagram?
The GREEN wire. The note says to cut the green wire and cap off the other end going to the transmission.
Which wires connect to the 4WD module in this diagram?
The GREEN wire and the BLUE-RED wire connect to the 4WD MODULE.
Where does the BLUE-RED wire go besides the 4WD module?
Through a diode, the BLUE-RED wire runs to the L4 shifter and the engine ECU.
Are diodes used in this circuit?
Yes. One diode is on the ACC 12VDC+ feed into the switch, and another is inline in the BLUE-RED wire between the 4WD module and the L4 shifter/engine ECU.

Comments

No comments yet.

More from this build

Low-angle view of black SUV front wheel with BFGoodrich off-road tire and chrome alloy Black Toyota Sequoia SUV on dirt forest trail, low front-quarter view with off-road tires Low-angle view of a black SUV on BFGoodrich all-terrain tires flexing over a dirt mound Hand holding a black rocker switch beside exposed dash wiring connectors Under-dash wiring harness with red tap splices and an 'ADD DIODE HERE' annotation pointing to a green wire Hand pulling wiring behind removed dashboard panel showing connectors and harness Scan tool screenshot showing DTC P1782 transfer case code for 2002 Toyota Sequoia Gray dash switch panel beside the steering column with rocker switch, rotary knob and dimmer wheel