2004.5-2005 LLY DSP5 Switch Installation.

This article will explain how to install your LLY DSP5 switch.

Switch Installation

1. Open your hood and locate your ECM.

ECM can be found near the battery located at the front driver side of the engine compartment.

Make sure you do not remove the TCM unit marked Allison on the driver side fan shroud.


2. Disconnect the ECM connectors from the ECM.

3. Locate the hood release grommet found on the driver side firewall.

It is a small rubber grommet located roughly 6 inches down from the hood at the firewall and 4 inches to the left of the driver side fender.


4. Pull the grommet out.

5. Run your guidewire through the hole into the cab and locate the guidewire under the                        dashboard.

6. Use electrical tape to secure the DSP5 wires to the guidewire.

7. Carefully pull the guidewire through the hood latch hole into the engine compartment. Make           sure that you have enough wire on the engine compartment side to run the wires into the                 ECM harness.

8. Use the conduit provided with your DSP5 switch to protect the switch wires from heat.

9. Carefully put the hood latch grommet back in place around the DSP wires.

It helps to make a small cut in the grommet for the wires to run through.


10. Now locate the gray connector on the ECM harness and make sure it is in the open position.

11. Using a small flat head screwdriver remove the top black cover by wedging the two tabs out            of their place.

12. Locate the Pin holes that the switch pins will go into, pinhole #32 and pinhole #50.

13. Remove the teal-colored slide that locks the pins in place. After this is removed be very                    careful not to pull on the connector and disconnect and existing wires.

14. Remove the light blue pinhole covers that are currently in the pinholes that your switch pins          will go into.

15. Push the DSP5 switch pins into the correct holes. Be sure that you push them in all the way to        the bottom of the ECM harness.

16. Reinsert the teal pin lock.

17. Reconnect the black cover to the top of the ECM connector.

18. Reconnect the ECM connectors to the ECM. Make sure that you start with the gray                            connector, then the black connector, and then the blue connector last.



If you are still having issues go to the DSP5 Switch Trouble Shooting section.