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Standard Ignition NS-641 Neutral Safety Switch
| Brand | Standard Ignition NS-641 |
|---|---|
| Color | Black |
| Connector Gender | Female |
| Connector Shape | Rectangular |
| Finish | Plastic |
| Mounting Type | Bolt Mount |
| Terminal Gender | Male |
| Terminal Type | Pin |
| Fits | Honda and Acura · 33 vehicles |
Bolt-mount design. Installs securely with a simple bolt-on attachment method.
12V operation. Built for standard electrical systems with a 9-terminal layout.
Black plastic finish. Durable housing with a rectangular connector and female plug.
Cross-references Standard Ignition NS-641, 28900RT4003 and CSW538 for the same application. See all 5.
Neutral Safety Switch for Honda and Acura
Standard Ignition NS-641 is a 12V neutral safety switch built with a black plastic finish, a bolt-mount design, and a rectangular female connector. It is used in automatic transmission starting circuits to help ensure the vehicle starts only in the proper gear range.
Compatible With select Honda and Acura applications, including Honda Pilot, Ridgeline, Odyssey, Accord, and Crosstour, plus Acura MDX, RDX, TL, ZDX, and RL. This part cross-references 28900RT4003 and NS7043 for the same application.
Key Features
- Standard Ignition NS-641 neutral safety switch
- 12V electrical design for automatic transmission start interlock circuits
- 9 male terminals with a single female rectangular connector
- Bolt-mount attachment for direct installation
- Black plastic finish with a 4-inch overall length
- No mounting hardware or gaskets included
Detailed Product Overview
The NS-641 is a replacement neutral safety switch for vehicles that use a 9-terminal, bolt-mounted switch assembly. It is built for Honda and Acura platforms where the switch communicates the transmission range position to the starting circuit, helping the engine crank only when the selector is in Park or Neutral. Standard Ignition NS-641 is a direct-fit service part for select 2010-2019 Honda and Acura models, including the 2016-2019 Honda Pilot, 2017-2019 Honda Ridgeline, and 2011-2017 Honda Odyssey.
Additional fitment includes 2010-2015 Acura MDX, 2013-2014 Acura RDX, 2012-2014 Acura TL, 2010-2013 Acura ZDX, 2013 Honda Accord, 2013 Honda Crosstour, and 2011-2012 Acura RL. The NS-641 part number is also a useful reference when searching for Honda and Acura neutral safety switch replacement by OE-style interchange.
What It Helps Address
- Engine no-crank condition when the shifter is in Park or Neutral
- Intermittent starting caused by a worn transmission range switch
- Incorrect starter engagement related to gear-position sensing
- Transmission range signal issues tied to the start interlock circuit
- Replacement needs after electrical wear at the switch connector or terminals
Installation Notes
Verify connector style, terminal count, and bolt-mount layout before installation. The switch uses a rectangular female connector with 9 male terminals and no wires, so the vehicle harness should match the original configuration. Confirm transmission range alignment during installation and follow the service procedure for the specific Honda or Acura model to ensure proper starting operation.
Quality Assurance
Standard Ignition supplies replacement electrical components for service applications, and NS-641 is built to match the listed fitment and connector specifications for the vehicles shown above.
| Year | Make | Model | Transmission | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2019 | Honda | Pilot | — | 3.5L | V6 | N/A | — |
| 2019 | Honda | Ridgeline | — | 3.5L | V6 | N/A | — |
| 2018 | Honda | Pilot | — | 3.5L | V6 | N/A | — |
| 2018 | Honda | Ridgeline | — | 3.5L | V6 | N/A | — |
| 2017 | Honda | Odyssey | — | — | — | N/A | — |
| 2017 | Honda | Pilot | — | 3.5L | V6 | N/A | — |
| 2017 | Honda | Ridgeline | — | 3.5L | V6 | N/A | — |
| 2016 | Honda | Odyssey | — | — | — | N/A | — |
| 2016 | Honda | Pilot | — | 3.5L | V6 | N/A | — |
| 2015 | Acura | MDX | — | — | — | N/A | — |
| 2015 | Honda | Odyssey | — | — | — | N/A | — |
| 2014 | Acura | MDX | — | — | — | N/A | — |
| 2014 | Acura | RDX | — | — | — | N/A | — |
| 2014 | Acura | TL | — | — | — | N/A | — |
| 2014 | Honda | Odyssey | — | — | — | N/A | — |
| 2013 | Acura | MDX | — | — | — | N/A | — |
| 2013 | Acura | RDX | — | — | — | N/A | — |
| 2013 | Acura | TL | — | — | — | N/A | — |
| 2013 | Acura | ZDX | — | — | — | N/A | — |
| 2013 | Honda | Accord | — | 3.5L | V6 | N/A | — |
| 2013 | Honda | Crosstour | — | 3.5L | V6 | N/A | — |
| 2013 | Honda | Odyssey | Automatic | — | — | N/A | — |
| 2012 | Acura | MDX | — | — | — | N/A | — |
| 2012 | Acura | RL | — | — | — | N/A | — |
| 2012 | Acura | TL | — | — | — | N/A | — |
| 2012 | Acura | ZDX | — | — | — | N/A | — |
| 2012 | Honda | Odyssey | Automatic | — | — | N/A | — |
| 2011 | Acura | MDX | — | — | — | N/A | — |
| 2011 | Acura | RL | — | 3.7L | V6 | N/A | — |
| 2011 | Acura | ZDX | — | — | — | N/A | — |
| 2011 | Honda | Odyssey | Automatic | — | — | N/A | — |
| 2010 | Acura | MDX | — | — | — | N/A | — |
| 2010 | Acura | ZDX | — | — | — | N/A | — |
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