2024-2026 Lexus TX 350 Auto Start Stop Eliminator | Plug & Play

A plug-and-play memory harness for the 2024–2026 Lexus TX 350. Out of the factory, Stop & Start comes back on at every key cycle. This module remembers your last choice and sends it again at the next start. It plugs in line with the factory connector named in the instructions, using factory-style plugs on both ends, so nothing is cut or spliced.

You can still use the original button at any time. Whatever you select last is what the module repeats on the next start. Take the module out and the vehicle behaves exactly as it did from the factory.

Vehicles and years covered

The fitment table for this SKU lists the following, each marked as a 100% fitment match:

• Lexus TX 350: 2024–2026

The listing is written around the first-generation (2024-up) TX. Trim levels are not split out in the table, so confirm that your vehicle has the stop-start button before ordering.

How Stop & Start behaves from the factory

The factory logic arms Stop & Start every time the engine starts. Turning it off with the button only lasts until the engine is shut down. Owners who sit in stop-and-go traffic, tow, or idle in drive-throughs often prefer it off, and that is where the repeated button press comes from.

Scope of the module

• Leaves engine and transmission software untouched.
• Leaves no permanent change after removal.
• Lets you re-enable the system with the factory button at any time.
• Holds the stop-start button state between drives.

If stop-start is not engaging

A Lexus TX 350 that rarely auto-stops is often telling you something about the battery. Stop-start vehicles usually run an AGM or EFB battery, and the system is one of the first features to drop out as that battery ages. Cabin temperature requests, engine temperature and brake pressure also factor in. None of these checks are altered by the module.

Where it connects

It plugs in line with the factory connector named in the instructions, using factory-style plugs on both ends, so nothing is cut or spliced. Disconnect nothing else and splice nothing. Once both plugs are locked, tuck the harness where it will not be pinched when the panel goes back on. Test by switching Stop & Start off, cycling the ignition and checking the indicator.

Day-to-day use

Stop-start saves the most fuel in long idles, but plenty of drivers would rather keep the engine running. Common reasons: towing or hauling, where an engine restart under load is unwelcome; drive-thru lines and parking lots, where the engine cycles on and off every few feet; hot days, when the A/C compressor stops with the engine on many vehicles; and stop-and-go traffic where the restart delay is noticeable when pulling into a gap. On a three-row luxury SUV, any of these can mean a button press at the start of nearly every drive.

If something does not look right

If the setting is not remembered, check that the module was installed with the ignition off and that the connector clicked into place. Then press the factory button once, switch the vehicle off, close the doors, give the electronics time to shut down, and start again. If it still resets, contact support with the year, trim and a photo of the connector.

Battery notes for stop-start vehicles

The module draws its power from the vehicle and does not change charging behavior. If your Lexus TX 350 sits for long periods, the same rules apply as without it: a maintainer helps, and a battery that tests weak should be replaced with the type specified for stop-start vehicles (usually AGM or EFB).

Quick fitment check

• Model year and model match a row in the table above (2024–2026 Lexus TX 350).
• Your Lexus TX 350 has the factory stop-start button. Base trims or engines without stop-start have nothing for the module to remember.
• The connector at your install point matches the one in the product photos.
• The battery and charging system test good and no warning lights are on.
• No aftermarket remote start, alarm or gateway bypass is wired into the same circuit. If one is, email support before ordering.
• If you are unsure, send your VIN to support@automotivebypass.com and we will confirm fitment.

Shipping, returns and warranty

Shipping is free to the contiguous US. Orders leave in 1–2 business days and usually arrive 3–4 business days later. Returns are accepted within 45 days with pre-approval; a 20% restocking fee applies and the buyer covers return shipping. The part carries a 3-year limited warranty, and support@automotivebypass.com answers Monday to Friday, 9–5 Pacific.