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.
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.
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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.
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