2021 Toyota Tundra H Key, Evo-One, Toy2 Harness

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=147179
Printed Date: May 13, 2025 at 3:42 PM

Topic: 2021 Toyota Tundra H Key, Evo-One, Toy2 Harness

Posted By: 97f150ext
Subject: 2021 Toyota Tundra H Key, Evo-One, Toy2 Harness
Date Posted: December 18, 2021 at 9:20 AM

2021 Toyota Tundra. H-Key (standard key). Eco-One with Toy 2 harness, remainder wire to wire. Module shows programmed through LEd flashes. After hitting lock 3x, truck kicks on ignition, then cranks, but no start. Security key light flashes on dash during remote start attempt. My guess is immobilizer isn’t programming. I’ve verified wiring, and reprogrammed twice.

Any suggestions? Truck is in my garage now.

Replies:

Posted By: 97f150ext
Date Posted: December 18, 2021 at 10:47 AM

So, figured it out.

I verified the wire to wire portion, of which I installed.

The stupid T Harness was wired incorrectly. Figured that out, moved the wires to the correct spot, and everything works.

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