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The Neutral Safety Switch (NSS) also known as the inhibitor switch is a crucial component in an automobile’s transmission system. It is designed to prevent the vehicle from starting or moving unless it is in neutral or park mode. The safety feature ensures the engine can only be started when the transmission is in a position where the vehicle won’t unexpectedly trip forward or backward. The neutral safety switch is an often-overlooked device that serves a crucial function, acting as a guardian between the ignition system and transmission.

Let’s discuss more about the inhibitor switch or NSS, its history, functions and how it works. 

History of Neutral Safety Switch

The concept of a safety switch linked to transmission dates back to the mid-20th century. As automatic transmissions became more prevalent, the need for a safety mechanism to prevent accidental starts and movements became apparent. The neutral safety switch was introduced to address this concern, ensuring that vehicles could only start safely when the transmission was in a stable position.

Over the years, advancements in car safety features led to the development of electronic NSS units, offering improved reliability and functionality. Today, the NSS remains a standard feature in automatic transmission vehicles, contributing to the overall safety and convenience of modern automobiles.

What is a Neutral Safety Switch

The inhibitor switch is typically mounted on the transmission and is directly connected to the shift linkage. When the gear selector is moved, it activates the switch, signalling the transmission’s position. Modern NSS units are often electronic and use car sensors to detect the gear selection, while older models may use mechanical linkages.

How Neutral Safety Switch Works 

The word neutral safety switch is derived from its main function of allowing the engine to start only when the transmission is in the neutral or park position. Let’s explore how NSS works in a vehicle.

Safety During Starting

When you turn the key to start your vehicle, the ignition switch sends an electrical signal to the NSS. The neutral safety switch then checks the position of the transmission. If it detects that the transmission is in gear (not in neutral or park), it prevents the electrical current from reaching the starter motor. However, if your car’s engine starts in neutral mode that means it has a bad neutral safety switch. Here are some more signs of a faulty neutral safety switch that can help you identify the issue. 

Connections and Circuits

The neutral safety switch is connected to both the ignition switch and the starter motor. It completes the circuit only if the transmission is in the neutral or park position, allowing the electrical current to flow and engage the starter.

Backup Lights

In addition to its role in preventing accidental starts, the neutral safety switch is often interconnected with the vehicle’s backup lights. When the transmission is in reverse, the switch sends a signal to illuminate the backup lights, enhancing safety during reversing manoeuvres. Here are some more tips to reverse your car properly with the help of the rear cross-traffic alert system.

Manual Transmission Applications

A neutral safety switch for manual transmission ensures that the engine can only start when the clutch is depressed, preventing the vehicle from lurching forward unexpectedly.

Diagnostic Tool Connection

In modern vehicles, the neutral safety switch is often integrated into the vehicle’s electronic control system. Mechanics can use diagnostic tools to check for faults or misalignments in the switch.

Types of Neutral Safety Switch

Here are the types of neutral safety switches you can find in the market.

1. Mechanical Switches: Found in older vehicles, mechanical neutral safety switches use physical linkages to connect the transmission system gear selector to the switch.
2. Electronic Switches: Common in modern vehicles, electronic NSS units use sensors to detect the position of the transmission gear selector. These sensors send signals to the switch, allowing for more precise and reliable operation.

Importance of the Neutral Safety Switch

The neutral safety switch plays a pivotal role in ensuring the safety and well-being of both the vehicle and its occupants. Let’s take a closer look at the importance of the neutral safety switch:

Accident Prevention

The primary function of the neutral safety switch is to act as a guardian against unexpected vehicle movement. By allowing the engine to start only when the transmission is in the neutral or park position, the switch prevents unsettling scenarios of a vehicle unexpectedly tripping forward or backward, thereby reducing the risk of car accidents caused by unintentional starts.

Transmission Protection

Another crucial role of the neutral safety switch is to safeguard the integrity of the transmission. By permitting the engine to start only when the transmission is in a stationary position (neutral or park), the switch prevents the transmission components from experiencing unnecessary strain during engine startup. This, in turn, promotes the longevity of the transmission and reduces the risk of premature wear and damage.

Enhanced Safety During Reversing

The integration of the neutral safety switch with the vehicle’s backup lights adds a layer of safety during reversing manoeuvres. When the transmission shifts into reverse, the switch sends a signal to illuminate the backup lights. This not only alerts those around the vehicle to its backward movement but also enhances visibility for the driver, contributing to a safer reversing experience. Besides, when reversing the car make sure your rearview mirror is set properly to avoid hitting any object.

Safety in Automatic Transmissions

The automatic transmission neutral safety switch allows the engine to start only when the transmission is in either the neutral or park position. This prevents the vehicle from moving unexpectedly when the engine starts, reducing the risk of accidents caused by unintended vehicle movement.

Safety in Manual Transmissions

The manual transmission neutral safety switch ensures that the engine can start only when the clutch is depressed. This prevents the vehicle from moving forward unexpectedly if the transmission is in gear, adding an extra layer of safety during the starting process. Also, car gear can stuck in parking mode if the car transmission fails in the process.

FAQs

What does a neutral safety switch do?

The primary function of the neutral safety switch is to act as an interlock between the car ignition system and the transmission. When the transmission is in either the ‘park’ or ‘neutral’ position, the switch allows the electrical current to flow, enabling the vehicle to start. If the transmission is in any other gear, such as ‘drive’ or ‘reverse,’ the switch prevents the flow of current, preventing the engine from starting.

What happens when a neutral switch goes bad?

When an inhibitor switch goes bad, common symptoms include the engine not cranking in park or neutral. This results in issues with reversing lights (either staying on or not coming on) and the illumination of the check engine light. If you experience any of these problems, it’s crucial to have your vehicle inspected by a qualified mechanic or adjust a neutral safety switch. Besides, there are some other reasons why the check engine light is on. 

This is all about a NSS in a car. From its inception in the mid-20th century to its integration into modern automotive technology, this small yet crucial component ensures your vehicle’s engine starts only when it’s safe to do so. 

If you’re in the market for a reliable vehicle, especially in the UAE, consider the importance of a well-maintained neutral safety switch for a worry-free driving experience. And for those seeking a quality used car in the UAE, explore the options available here, where safety and performance come hand in hand.

Stay tuned to the dubizzle car blogs to learn more about car parts and their functions.