2022-2026 Lexus NX350 Auto Start Stop Eliminator | Plug & Play

If your Lexus NX350 turns Stop & Start back on every time you start it, this plug-and-play memory harness solves that one problem: it remembers the last setting and restores it at the next ignition cycle. Coverage is the 2022–2026 Lexus NX350. 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.

It does not delete the feature. Turning stop-start back on is the same button press as before, and the module will remember that too. Removing it returns the vehicle to its original default.

Fitment

This part is listed for these vehicles, all marked 100% fitment match:

• Lexus NX350: 2022–2026

The listing is written around the second-generation (2022-up) NX. The table does not separate trims; what matters is that the vehicle has factory stop-start and the connector shown in the photos.

What the factory system does

On the Lexus NX350, Stop & Start shuts the engine down at a stop and fires it back up as the brake is released. You can switch it off with the dash button, but the choice is not saved. The next ignition cycle brings the default back. The module keeps the choice you made instead.

Where owners notice the difference

Some owners only want stop-start off in certain seasons or on certain trips, such as towing a trailer or crawling through summer traffic with the A/C working hard. Because the module remembers whatever you chose last, it works both ways: leave the system off for a week, then switch it back on with the factory button and it stays on.

What the module does and does not do

• Fuel use changes only the way it would if you pressed the off button yourself.
• Comes out in the same way it went in, with nothing cut.
• Carries your stop-start choice over to the next drive.
• Does not disable warning lights or diagnostic functions.

Troubleshooting notes

A dead or weak battery, a charging problem or an unrelated module fault will change how Stop & Start behaves with or without this part installed. Scan the vehicle for stored codes, test the battery and confirm the system works normally with the factory button before installation. That baseline makes any later issue easy to pin down.

A note on the battery

Most stop-start systems watch battery condition closely through a sensor on the negative terminal. When the battery ages, the system quietly stops auto-stopping long before the battery fails to crank. Keeping the original battery type (AGM or EFB) and a clean, tight ground connection avoids a lot of confusion about why the system behaves differently from week to week.

If stop-start is not engaging

Even with Stop & Start enabled, the engine control logic only stops the engine when conditions allow it. Typical blockers are a low battery state of charge, an engine that has not reached operating temperature, heavy heating or A/C demand, steering input, an open door or unlatched seatbelt, and some drive modes. If the system never seems to stop the engine, one of these is usually the reason, and the module does not change that logic.

Installation and removal

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.

Quick fitment check

• Model year and model match a row in the table above (2022–2026 Lexus NX350).
• Your Lexus NX350 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.
• No aftermarket remote start, alarm or gateway bypass is wired into the same circuit. If one is, email support before ordering.
• The battery and charging system test good and no warning lights are on.
• If you are unsure, send your VIN to support@automotivebypass.com and we will confirm fitment.

Warranty and returns

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.