1995 3000GT VR-4: Wiper Switch Modification

• Why Do I Want To Do This?

  • If you never or rarely use your rear wiper in intermittent mode, you can perform this modification so that you can use that switch for something else. This will allow you to have an extra switch in the car while maintaining the factory look.
  • If you have a car without the active exhaust system, you have space for an extra switch beside the OEM wiper switch. If you buy an extra wiper switch from a junkyard or dealer, you can install it in the location normally used for the active exhaust switch. Again, this keeps the factory look and provides extra switches for controlling other components.




• How Long Will It Take Me To Do This?

  • For just the switch modification, you can do it in 15 mintutes. After that, you'll need to route the wire(s) to the component you want to control.




• Anything I Should Do Prior To Attempting This Procedure?

  • Nope.




• What Mitsubishi Parts Will I Need?

  • None.




• What Other Parts Will I Need?

  • (2) 18-22ga Fully Insulated Male Quick Disconnect Fitting
  • (1) 14-18ga T-tap




• Where Can I Get the Stuff To Do This?

  	Part	Company/Contact	Part Number
  	14-18ga T-tap	McMaster-Carr	69515K24
  	18-22ga Fully Insulated Male Quick Disconnect Fitting	McMaster-Carr	7243K12





• What Tools May/Will I Need?

  • Wire Cutter
  • Crimping/stripping Tool
  • Flat-blade Screwdriver

The Procedure

	Pull Switch Assembly Out of Dash
	Insert a screwdriver under the trim and gently pry it away from the dash.
	Remove Switch Assembly
	Disconnect the wiring harness from the back of the switch and move the switch assembly out of the way.
	Identify Wires
	Figure out which wires you'd like to use and cut them away from the OEM wiring bundle if necessary. I chose to use wires 7 and 8 (black and black/light blue) because they are only used for the rear wiper's intermittent function, which I never use. This leaves me with a switch that still operates the rear wiper (ON mode only) and the rear washer, but allows me to connect an extra component to the switch. Since I wanted to use the switch to control my water injection system and I wanted the WI system to operate with the key in both the ACC and ON positions, I simply connected the wire I cut from Pin 7 to the wire for Pin 6 (Light Blue), which is an ACC power wire. This leaves the wire I cut from Pin 8 (black) available for connection to the WI system. To summarize, wire connected to Pin 8 will be disconnected when the switch is in the OFF or ON positions. The rear wiper will operate normally as far as the OFF and ON positions are concerned. Also, the washer pump will work normally. When the switch is turned to the INT position, it will now apply 12V power to the wire connected to Pin 8, which will provide power to my Water Injection system. Further, when the switch is in the INT position, there will be no power to the rear wiper motor or washer pump.
	Cut Wires From Harness
	For my particular application, I needed to cut the wires connected to pins 7 and 8 in the washer switch harness. These wires are the black wire and the black wire with the light blue stripe.
	Attach Wires To New Location(s)
	I attached a t-tap to the light blue wire connected to Pin 6 and then connected the cut end of Pin 7 to this t-tap. I then attached a quick-disconnect connector (red) to the cut wire connected to Pin 8. The red connector in the picture is the wire that will provide power to my WI system. It is unconnected when the switch is in the OFF or ON position and has 12V power when the switch is in the INT position.