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Standard Ignition NS-549 Neutral Safety Switch
| Brand | Standard Ignition NS-549 |
|---|---|
| Color | Black, Silver |
| Connector Gender | Male |
| Finish | Metal, Plastic |
| Terminal Gender | Male |
| Terminal Type | Bullet |
| Fits | BMW · 14 vehicles |
Bolt mount. Installs securely with a simple bolt-on attachment method.
5-wire design. Uses a five-wire layout with bullet terminals for dependable electrical connection.
Metal and plastic construction. Combines durable materials with a black and silver finish.
Cross-references Standard Ignition NS-549, 24101422523 and NS6767 for the same application. See all 5.
Neutral Safety Switch for BMW Applications
Standard Ignition NS-549 is a 12V neutral safety switch built for select BMW vehicles with automatic transmission starting circuits. It uses a bolt-mount design with a round connector and 5 male terminals to support reliable electrical engagement in the shift interlock system.
Compatible with 2000-2003 BMW X5, 1997-2001 BMW 740i, and 1997-1999 BMW 540i, this NS-549 replacement is a direct-fit electrical service part for common no-start and shift-interlock concerns on these applications.
Key Features
- Neutral safety switch for automatic transmission start-circuit control
- Standard Ignition NS-549 replacement part
- 12V electrical component with 5-wire, 5-terminal layout
- Male connector and male bullet terminals
- Bolt-mount attachment for secure installation
- Black and silver metal/plastic construction
- Round 1-connector design with 17.5 in. wiring harness length
Detailed Description
The Standard Ignition NS-549 neutral safety switch is engineered for BMW starting-system applications where the transmission range signal must be recognized before the engine will crank. It is built with a metal and plastic housing, a round connector, and a 17.5-inch wiring harness to match the electrical routing used on the listed vehicles. This part cross-references RB4006 and S51066 for the same application. Use NS-549 when servicing the neutral safety circuit on BMW X5, BMW 740i, or BMW 540i models covered by the fitment data.
Common Issues This Part Can Address
- Engine will not crank in Park or Neutral
- Intermittent no-start condition related to the transmission range circuit
- Starter engagement only in certain shifter positions
- Faulty neutral safety signal to the starting system
- Transmission range switch electrical wear or connector-related failure
Installation Notes and Tips
Verify connector style, terminal count, and bolt-mount location before installation. Inspect the harness, terminals, and surrounding shift linkage for damage or corrosion, and confirm proper adjustment after replacement so the starter circuit recognizes Park and Neutral correctly. NS-549 is listed for 2000-2003 BMW X5, 1997-2001 BMW 740i, and 1997-1999 BMW 540i.
Quality Assurance
Standard Ignition supplies this neutral safety switch as a service replacement for the listed BMW applications. Confirm fitment by year, make, and model before installation.
| Year | Make | Model | Transmission | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2003 | BMW | X5 | Automatic | 4.6L | V8 | N/A | — |
| 2003 | BMW | X5 | Automatic | 4.4L | V8 | N/A | — |
| 2002 | BMW | X5 | Automatic | 4.4L | V8 | N/A | — |
| 2002 | BMW | X5 | — | 4.6L | V8 | N/A | — |
| 2001 | BMW | 740i | — | 4.4L | V8 | N/A | — |
| 2001 | BMW | X5 | — | 4.4L | V8 | N/A | — |
| 2000 | BMW | 740i | — | 4.4L | V8 | N/A | — |
| 2000 | BMW | X5 | — | 4.4L | V8 | N/A | — |
| 1999 | BMW | 540i | — | — | — | N/A | — |
| 1999 | BMW | 740i | — | 4.4L | V8 | N/A | — |
| 1998 | BMW | 540i | — | — | — | N/A | — |
| 1998 | BMW | 740i | — | 4.4L | V8 | N/A | — |
| 1997 | BMW | 540i | — | — | — | N/A | — |
| 1997 | BMW | 740i | — | 4.4L | V8 | N/A | — |
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