M501 B Car Immobilizer Anti-theft System

1. Introduction

The M501 B Car Immobilizer Anti-theft System is a compact and effective security solution designed to protect your 12V vehicle from theft. This system features intelligent anti-theft functions, an emergency release mechanism, and advanced anti-interference technology to ensure reliable operation. This manual provides detailed instructions for the proper installation, operation, and maintenance of your new car immobilizer.

Figure 1: Car Immobilizer Relay Unit and Remote Controllers

2. Package Contents

Please check the package carefully to ensure all items are present:

• 1 x Car Immobilizer (Host Unit/Relay)
• 2 x Remote Controllers
• 1 x User Manual

Figure 2: Package Contents Overview

3. Specifications

Figure 3: Immobilizer Unit Dimensions

4. Setup and Installation

The M501 B Car Immobilizer is designed for 12V vehicle systems. Installation typically involves replacing an existing relay in your vehicle's electrical system. It is crucial to identify the correct relay type and location before proceeding.

4.1. Important Considerations

• This device is a 4-pin relay type. Ensure your vehicle's existing relay is compatible (e.g., Model B type with pins 30, 87, 85, 86).
• Professional installation is recommended if you are unfamiliar with automotive electrical systems.
• Always disconnect the vehicle's battery before attempting any electrical work.

4.2. Installation Steps

1. Identify Target Relay: Locate the relay in your vehicle that controls the ignition or fuel pump circuit. This is the relay that will be replaced by the immobilizer unit. Consult your vehicle's service manual for relay box diagrams.
2. Verify Relay Type: Confirm that the existing relay is a 4-pin type with pin configurations similar to the immobilizer unit (e.g., 30, 87, 85, 86).
3. Disconnect Battery: Disconnect the negative terminal of your vehicle's battery to prevent electrical shorts.
4. Remove Existing Relay: Carefully pull out the existing relay from its socket.
5. Insert Immobilizer: Insert the M501 B Car Immobilizer unit into the vacant relay socket, ensuring the pins align correctly.
6. Reconnect Battery: Reconnect the negative terminal of your vehicle's battery.
7. Test System: Proceed to the Operating section to test the system's functionality.

Figure 4: Immobilizer Relay Pin Configuration

Figure 5: Detailed View of Relay Pins

5. Operating Instructions

The M501 B system operates automatically to provide security for your vehicle.

5.1. Intelligent Anti-theft Function

• After the car engine is turned off, the system will automatically enter the anti-theft state after 15 seconds.
• Once in anti-theft mode, the car cannot be started without the presence of the remote control.

5.2. Normal Operation

• When a valid remote control is within the detection range (approximately 15 meters), the immobilizer system will disarm automatically.
• The car can then be started normally.

Figure 6: Remote Control Signal Transmission

Figure 7: Activating the Immobilizer with Remote

6. Maintenance

6.1. Remote Control Battery Replacement

The system will provide a low voltage reminder when the remote control battery is running low. To replace the battery:

1. Carefully open the remote control cover.
2. Remove the old CR2032 button battery.
3. Insert a new CR2032 button battery, ensuring the positive (+) and negative (-) poles are correctly oriented.
4. Close the remote control cover securely.

Figure 8: Remote Control Detail

7. Troubleshooting

7.1. Emergency Release Function

If your remote control is lost or its battery is dead, you can use the emergency release function to start your car:

1. Locate the emergency release button on the immobilizer host unit (relay).
2. Press and hold the emergency release button for 3 seconds.
3. Within 10 seconds of releasing the button, start the car.

This function allows you to bypass the immobilizer temporarily in emergency situations.

8. User Tips

• Relay Amperage: The M501 B immobilizer has a load current of 30A. If your vehicle's original relay is rated for a higher amperage (e.g., 40A), ensure that replacing it with a 30A unit is safe and compatible with your vehicle's electrical system to avoid potential issues. Consult a professional if unsure.
• Remote Control Range: Keep the remote control within approximately 15 meters of the vehicle for reliable disarming of the immobilizer.
• Battery Life: Pay attention to the low battery reminder for the remote control to avoid being stranded. Always carry a spare CR2032 battery or the second remote control.

9. Warranty and Support

For any issues or questions regarding your M501 B Car Immobilizer Anti-theft System, please contact your retailer or the manufacturer's customer support. Keep your purchase receipt as proof of purchase for warranty claims. Specific warranty terms and conditions may vary by region and retailer.