Home Auto Repair How to Run Wire in the Firewall of a Nissan Altima

How to Run Wire in the Firewall of a Nissan Altima


The Nissan Altima is a popular vehicle in the Infiniti/Nissan family. Owners of the Altima often require access to the battery or engine compartment, when they run accessory wiring from the cabin. Finding the stock wiring harness location leading into the engine compartment is the method that allows wiring with or without the presence of a clutch. Running wires through the Altima’s firewall, although challenging, is made easier when you know where to look. Items you will need: Utility knife, Handheld mirror, Wire, Plastic zip ties

Step 1 – Open the driver’s side door. Get on your knees, and peer under the driver’s side dash, close to the emergency brake. Alternatively, use the hand-held mirror to get your bearings under the dash.

Step 2 – Reach up under the dash by the emergency brake. Look for a bulge in the carpet padding about the size of a racquetball.

Step 3 – Pull the carpet padding down to reveal the wire harness protruding into the Altima’s cabin from the engine compartment.