Interfacing to the User Interface Button
One wire: gray (plus ground: black)
The TDS-1 has multiple operation modes. A button is used to select the active mode. Each press of the button advances to the next mode. A long button press (> 2 seconds) is used to enter and exit configuration mode.
The TDS-1 is not supplied with an external button. There is a button mounted on the TDS-1 which operates identically to an external button. If you want to run the TDS-1 in only one mode (i.e. peak boost mode), then an external button is not necessary. The built-in button can be used to configure the TDS-1 and select the desired mode at setup time, and the TDS-1 will start up in that mode in the future, even when power is disconnected for an extended period of time.
For most users, a a user-supplied button should be connected to the TDS-1. This button must be a momentary, normally open switch. Many different styles of switches of this type are available at Radio Shack or other electronic component vendors. It is also possible to use an Audi switch from a dealership or junkyard, if you can find one with momentary contacts. It is a matter of personal preference which button is used and where it is mounted. A few suitable switches and locations will be discussed.
Connecting the switch
The TDS-1 wiring harness contains a gray and a black wire twisted together. These connect to the momentary, normally open pushbutton of your choice. The black wire is connected to the TDS-1 ground wire in the harness.
Suggested button locations and types
- Switch panel above radio
- Differential lock panel
- Retrofitted trip computer stalk?
Suggested switches
- Radio Shack #275-644
- Any momentary normally open pushbutton that you find aesthetically pleasing