How to find resistor value VATS key?

How to Find Resistor Value VATS Key?

Vehicle Anti-Theft System (VATS) keys are a common feature in most General Motors (GM) vehicles manufactured between the late 1980s and early 2000s. These keys have a built-in resistor that communicates with the vehicle’s ignition system to ensure the key is authorized to start the engine. However, if you lose or damage your VATS key, finding the correct resistor value becomes crucial in order to bypass the system and start your vehicle. In this article, we will guide you through the process of finding the resistor value for a VATS key.

Tools Required:

To find the resistor value of your VATS key, you will need the following tools:
– Multimeter (preferably digital)
– Wire cutters or strippers
– A resistor assortment kit or individual resistors of various values (10-20 resistors in the range of 500-2000 ohms should be sufficient)
– Electrical tape or soldering iron and solder

Steps to Find Resistor Value VATS Key:

Follow these steps to determine the resistor value of your VATS key:
1. Gather your tools and ensure you have a comfortable and well-lit workspace.
2. Locate the steering column where the ignition lock cylinder is located.
3. Identify the two small wires connected to the ignition lock cylinder. These wires are usually thin and of different colors.
4. Disconnect the connector on the wiring harness that connects to these two wires.
5. Insert the key into the ignition lock cylinder and turn it to the “ON” position, but do not start the engine.
6. Use wire cutters or strippers to expose a small section of each wire.
7. Connect the positive lead (red) of the multimeter to one of the exposed wires and the negative lead (black) to the other wire.
8. Set the multimeter to the resistance (ohms) range.
9. Note down the resistance value displayed on the multimeter. This value represents the resistor value for the VATS key installed in your vehicle.
10. Repeat this process a few times to get consistent readings.
11. **The resistance value you obtained from step 9 is the resistor value of your VATS key.** Keep this value in mind or write it down for reference.
12. Now that you know the resistor value, you can use a resistor assortment kit or individual resistors to bypass the VATS system. Simply solder or connect the appropriate resistor in place of the VATS key to allow the vehicle to start.

Frequently Asked Questions (FAQs):

1. What is a VATS key?

A VATS key is a vehicle key with a built-in resistor that communicates with the vehicle’s ignition system to prevent unauthorized starting of the engine.

2. Why would I need to find the resistor value of a VATS key?

If you lose or damage your VATS key, finding the correct resistor value allows you to bypass the system and start your vehicle.

3. Can any resistor be used to bypass the VATS system?

No, the resistor used to bypass the VATS system must have the same value as the original key’s resistor to authenticate with the ignition system.

4. Can I use a multimeter to find the resistor value of a VATS key without cutting wires?

No, to directly measure the resistor value, you need to access the wires connected to the ignition lock cylinder.

5. Are all VATS keys resistors the same?

No, different VATS keys may have different resistor values corresponding to their individual keys.

6. Can I use a VATS bypass module instead of a resistor?

Yes, VATS bypass modules are available that can mimic the resistor value of your original key, effectively bypassing the entire system.

7. What if my VATS key has no resistor or I cannot find it?

In such cases, it is recommended to contact a professional locksmith or your vehicle’s dealership for assistance.

8. How can I ensure the resistor value I obtained is accurate?

By repeating the resistor value measurement process a few times, you can ensure consistency and accuracy in the readings.

9. Is it possible to disable the VATS system completely?

Disabling the VATS system completely may not be possible without modifications to the vehicle’s wiring or using specialized equipment.

10. Will bypassing the VATS system affect my vehicle’s security?

By bypassing the VATS system, you essentially eliminate an important security feature, so it is crucial to take additional measures to ensure the security of your vehicle.

11. Can I program a new VATS key once I have determined the resistor value?

Programming a new VATS key generally requires special equipment and knowledge. It is advisable to reach out to a professional locksmith or your vehicle’s dealership for programming assistance.

12. Are VATS keys used in vehicles other than GM?

VATS keys were primarily used in GM vehicles, but similar key systems may be present in other car manufacturers as well. It is best to consult your vehicle’s manual or contact a professional for accurate information.

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