Here is a set of photos showing where I entered the firewall from the engine side to put the Passport cabling through, or for any wiring for that matter. I also checked the drivers side, but for my needs the passanger side seemed easiest/cleanest for placement of the Passport ECU near the bottom of the glovebox.
As you look at the closeup photo it looks like the wires enter the firewall in the photo. Actually where you see the cable enter is an 'outside'/engine side metal facing plate, which already had an OEM hole, so you can use that existing hole as a simple guide. Right behind that face plate, about 1-2 inches back, is the firewall. I used a cone drill bit to get past the front face plate and drilled a 1" hole into the firewall, used a gromet for the inner hole, and sealed with silicone for added water tight security.
On the interior side of the fireall hole there were no wires/obstructions to hit when drilling. There is the sound proofing/heat pad. The hole will be on the higher side, back and behind, and a bit above the glove box. Worked perfectly for placement of the Passport ECU in the plastic underlining shroud, below the glovebox. It only takes a minute to remove the glove box.
As you look at the closeup photo it looks like the wires enter the firewall in the photo. Actually where you see the cable enter is an 'outside'/engine side metal facing plate, which already had an OEM hole, so you can use that existing hole as a simple guide. Right behind that face plate, about 1-2 inches back, is the firewall. I used a cone drill bit to get past the front face plate and drilled a 1" hole into the firewall, used a gromet for the inner hole, and sealed with silicone for added water tight security.
On the interior side of the fireall hole there were no wires/obstructions to hit when drilling. There is the sound proofing/heat pad. The hole will be on the higher side, back and behind, and a bit above the glove box. Worked perfectly for placement of the Passport ECU in the plastic underlining shroud, below the glovebox. It only takes a minute to remove the glove box.
