Duramax DSP5 SOTF Switch Installation Guide
Pin Locations for Each Model
The DSP5 switch includes two wires that come pre-crimped with pins. The color of the wire doesn't matter when connecting it to the pins, but you should ensure that the following pin locations are used for each model:
- 2001-2004 LB7: Blue ECM connector - Pin #49 & Pin #69
- 2004.5-2005 LLY: ECM connector labeled J3 - Pin #32 & Pin #50
- 2006-2010 LBZ/LMM: ECM connector #1 (the larger of the two) - Pin #46 & Pin #54
- 2011-2016 LML: Gray ECM connector J3 - Pin #11 & Pin #35
Testing the Switch
- Insert the pins into the correct slots.
- Reconnect the ECM and turn the ignition to the ON position.
- Press the small white test button on the back of the switch.
- If one LED lights up, the pins are correctly placed. If no LED lights up, verify wiring connections.
Installing the DSP5 Switch
The DSP5 switch comes with one nut and two washers. Follow these steps to install correctly:
- The smooth washer should remain at the bottom with the tab inserted into hole #5.
- If the washer is dislodged, turn the switch fully to the left (counterclockwise) and reposition the washer with the pin into hole #5.
- Ensure the switch rotates exactly 4 positions clockwise. If it doesn’t, loosen the nut and adjust the pin’s position.
Important Notes:
- Do not cut or ground any wire pins.
- Loosen the set screw before attaching the knob to the switch.
- Only square or rectangular pins will fit one way; do not force them into place. If it’s not fitting, check the orientation of the pin.
