Connecting and Using an Overdrive Cancel Switch and Indicator
If your transmission needs one, the COMPUSHIFT controller provides an input wire for an overdrive cancel switch and an output wire to drive an LED indicator when the overdrive cancel function is active.
The switch can be wired in a number of different ways so that it can be used with an aftermarket switch or integrated into a vehicle’s existing wiring.
Wiring the Switch
The OD cancel switch can be wired four different ways. The table below outlines the different ways to wire the switch, and how to set the parameters in the Vehicle Settings/Transmission Options menu.
If this input is present on the harness and not being used, it should be taped off to prevent an inadvertent short circuit.
Switch Configuration | Overdrive Cancel | Overdrive Cancel | Notes |
|---|---|---|---|
Pushbutton switch to ground | Momentary, Initially On Momentary, Initially Off | To Ground | Press the button to toggle between on and off. When the switch action is set to “Initially On” the system will power on with the overdrive cancelled. |
Toggle switch to ground | Toggle | To Ground | Moving the switch to the on position cancels overdrive. |
Pushbutton switch to vehicle +12 power | Momentary, Initially On Momentary, Initially Off | To Power | Press the button to toggle between on and off. When the switch action is set to “Initially On” the system will power on with the overdrive |
Toggle switch to vehicle +12 power | Toggle | To Power | Moving the switch to the on position cancels overdrive. |
Wiring the LED
The OD cancel indicator output has sufficient power to run an LED, but not an incandescent lamp. The output is current limited, and can run most LED’s without adding a resistor, though the presence of one will usually not affect anything.
The anode (positive side) of the LED should be wired to the output, and the cathode (negative side) should be wired to ground.
If the output isn’t going to be used, it should be taped off in the harness.