！Before installation, confirm that：
This high-performance component does not comply with the laws and regulations for highway driving and cannot be used on any vehicle that has been registered or certified for use on highways. This means that the component may only be suitable for racing cars or other off-road vehicles. If it is installed on vehicles driving on the highway, legal issues will be borne by oneself.
This is the installation process for the ER-0304: 2001-2004 Chevy GMC Duramax LB7 5-Position SOTF Switch,provided for your reference during installation.
Step 1:
First, open the truck hood. It is recommended to disconnect the negative terminals of both power sources.
Step 2:
Locate the Engine Control Module (ECM). The ECM is located in the front of the engine compartment on the driver's side, near the battery.
Step 3:
Disconnect the ECM connector. You will need a 7mm socket wrench to remove the ECM wiring harness.
Step 4:
Cut a small notch in the rubber gasket to the left of the driver's side step in the cab. Be careful not to damage any wires in the harness.
Step 5:
Use a wire or steel wire to thread through the firewall and the rubber gasket, and secure one end of the switch wire to the wire or steel wire with tape. Pull the switch wire into the engine compartment.
Step 6:
Pull the switch wire correctly to the ECM location and wrap the switch wire with the flexible tubing provided in the kit.
Step 7:
Locate the blue connector on the ECM wiring harness. Use a small flathead screwdriver to remove the gray cover on top. Handle with care; this part is easily damaged and may be difficult to remove at first.
Step 8:
After removing the gray protective cover, locate pin holes #49 and #69. Look closely; you'll see these numbers printed on the ECM connector.
Step 9:
Remove the blue cover on the side of the wire pins. Use a small flathead screwdriver to press down the clips on both sides of each blue cover.
Step 10:
Locate pin holes #49 and #69 where the switch pins will insert, and then install the wires. The wire color is irrelevant; you can insert different pin holes. Ensure all components are fully pushed in and locked in place, making them look identical to the other components.
Step 11:
Replace the blue cover on the ECM harness. Reattach the gray cover to the top of the ECM harness. Reconnect the ECM harness to the ECM.
Step 12:
Find a suitable location, drill holes, and install the switch. The specific location may vary depending on the truck model and individual operating habits.
Step 13:
After installing the switch, bundle and organize the switch harness and other wiring harnesses under the dashboard.
This high-performance component does not comply with the laws and regulations for highway driving and cannot be used on any vehicle that has been registered or certified for use on highways. This means that the component may only be suitable for racing cars or other off-road vehicles. If it is installed on vehicles driving on the highway, legal issues will be borne by oneself.
This is the installation process for the ER-0304: 2001-2004 Chevy GMC Duramax LB7 5-Position SOTF Switch,provided for your reference during installation.
First, open the truck hood. It is recommended to disconnect the negative terminals of both power sources.
Step 2:
Locate the Engine Control Module (ECM). The ECM is located in the front of the engine compartment on the driver's side, near the battery.
Disconnect the ECM connector. You will need a 7mm socket wrench to remove the ECM wiring harness.
Cut a small notch in the rubber gasket to the left of the driver's side step in the cab. Be careful not to damage any wires in the harness.
Step 5:
Use a wire or steel wire to thread through the firewall and the rubber gasket, and secure one end of the switch wire to the wire or steel wire with tape. Pull the switch wire into the engine compartment.
Step 6:
Pull the switch wire correctly to the ECM location and wrap the switch wire with the flexible tubing provided in the kit.
Step 7:
Locate the blue connector on the ECM wiring harness. Use a small flathead screwdriver to remove the gray cover on top. Handle with care; this part is easily damaged and may be difficult to remove at first.
Step 8:
After removing the gray protective cover, locate pin holes #49 and #69. Look closely; you'll see these numbers printed on the ECM connector.
Remove the blue cover on the side of the wire pins. Use a small flathead screwdriver to press down the clips on both sides of each blue cover.
Step 10:
Locate pin holes #49 and #69 where the switch pins will insert, and then install the wires. The wire color is irrelevant; you can insert different pin holes. Ensure all components are fully pushed in and locked in place, making them look identical to the other components.
Replace the blue cover on the ECM harness. Reattach the gray cover to the top of the ECM harness. Reconnect the ECM harness to the ECM.
Find a suitable location, drill holes, and install the switch. The specific location may vary depending on the truck model and individual operating habits.
After installing the switch, bundle and organize the switch harness and other wiring harnesses under the dashboard.
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