Permanently Disable GM Passlock System – How To Do It?

How to permanently disable the GM PassLock system? What is the ignition switch wiring PassLock bypass diagram (as well as the ignition wire to starter solenoid)? Anti-theft devices are made to keep somebody from stealing your car. These systems are always changing. Essentially, they function by cutting off an electrical circuit to stop electricity from flowing in some way, preventing your car from starting or instantly dying. Your engine immobilizer may be the only component in an anti-theft system, or it may additionally include a car alarm.

Your car’s anti-theft system might malfunction at some point in the future. This could happen for various reasons, such as a dead remote battery or a dead automobile battery that has lost its key memory. It’s also possible that the automobile door lock or the immobilizer chip in your key is broken. Let’s learn how to permanently disable Passkey 3 without further ado.

• PassLock Bypass Diagram
• Function Of PassLock Sensor
• Theft Deterrent Module Location
• How to Disable PassLock
• PassLock Relearn Not Working
• Bypass Instructions?
• Chevy Ignition Recall
• FAQs
• Final Verdict

Ignition Switch Wiring PassLock Bypass Diagram

The GM PassLock does not use a transponder. To check if the lock cylinder is aligned and in place when the car starts, it uses a conventional metal key that was once used and recorded voltage measurements obtained by a Hall Effect sensor. The system only offers this security feature in Passkey 3 wiring diagram.

The BCM (Body Control Module) will be able to send a code to the PCM (Powertrain Control Module) permitting the engine to start/run if the sensor reading is within about 5–10% of a previously recorded value. Having a properly cut key to open the door and crank the ignition cylinder should give additional security because removing the ignition cylinder should deactivate the car.

The ignition switch on the far end of the cylinder will turn on after the cylinder rotates inside its casing after the appropriately cut key is inserted, aligning the lock tumblers and retracting the cylinder lock bar. The PassLock II key has no marks on the shaft and is a typical double-sided GM key. The key has a long oval hole at the end.

Functionality Of PassLock Sensor

The key is a typical double-sided GM key, and its sole purpose is to appropriately engage the tumblers so that the ignition cylinder can rotate. The ignition cylinder operates similarly to a regular ignition by pressing its end against the rotary switch. After being taken out, the ignition switch can be set in place by rotating a screwdriver within the cylinder casing.

A small pin or screwdriver can be placed through the top hole to depress the spring-loaded retainer, allowing the cylinder to be pulled out of the case after the key has been inserted and rotated to the “start” position.

A key-retention solenoid is located on the back of the casing and stops the cylinder from rotating into the “Off” position while the vehicle is in gear, preventing key removal unless the ignition switch is in the park or neutral position.

GM Theft Deterrent Module Location

The Hall Effect sensor and circuit plugs required for the ignition system to work are housed in the ignition case, which is attached to the steering column by screws. The steering wheel and related components must first be taken out of the vehicle in order to access all of the screws holding the casing to the steering column.

A normally-open pushbutton switch marked “key-in” is located on the top and slightly to the back of the casing. This switch rests in a groove in the lock cylinder that, depending on where in the rotation the cylinder is, either closes or opens the lock.

The magnet fitted into the side aligns with the Hall Effect sensor when the cylinder is spun. As a result, the sensor’s resistance changes, and a reference voltage is transmitted down the signal wire to the BCM.

The pre-programmed reference voltage must match the voltage received within tolerance for the pre-programmed reference voltage to be sent to the PCM with the appropriate code enabling start/run. The varying reference voltages provide the variation between various lock cylinders that different-sized magnets will create.

Malfunctions Of PassLock Sensor

The Hall Effect sensor can malfunction, but this is not a typical or frequent point of failure. The use of Hall Effect sensors is fairly straightforward. The permanent magnet produces a magnetic interference in the sensor proportional to the magnet’s strength in the lock cylinder.

Most of the variables are mechanical or electrical because it is unlikely that the sensor will malfunction or the magnet strength will fluctuate. The output reference voltage will decrease if the voltage applied to the sensor decreases. This is why a weak battery may occasionally make it difficult to start the car.

Mechanical failures are often restricted to temperature extremes that can alter the magnet’s and the sensor’s distance due to the metals’ expansion or contraction. The resistance then varies as a result of this. Failures caused by dirt or debris are uncommon and unlikely because the device is sealed, but they are possible.

Because of these variations, the system is designed with a 5 to 10% tolerance range. However, extremely low battery voltages or extremely high temperatures may exceed these limitations and prohibit the car from starting.

Resistance in the wires will grow if they become frayed, shorted, or overly worn, which may also cause the reference voltage to fall outside of tolerance. As if a new cylinder with a different magnet were placed, this wear can be corrected using a recalibration or reprogramming sequence to learn the adjusted resistance.

Extreme temperature differences or shifts, as well as wiring problems, can occasionally be the cause of intermittent problems. Depending on where the system is bypassed, a bypass might not be able to resolve these problems without thoroughly inspecting the entire wiring harness for anything that might change the resistance of the wires, including frayed wiring.

How To Permanently Disable GM PassLock System

The irritating issues that anti-theft systems bring about are well documented. Most users claim that an anti-theft system will activate even when there are no external dangers, meaning that it could result in a false alarm. If there is a problem, follow the instructions below on how to turn off the anti-theft system:

Permanently Disable GM PassLock System Option #1 – Key And Cylinder Inspection

Checking the key fob battery should be done first. The false anti-theft alarm is likely to go off in the event that it is dead and has not turned off the system. If the battery dies, replace it with a new one. You might then examine the door lock cylinder.

The burglar would have attempted to unlock the doors if the theft attempt was genuine.

Another scenario is that you might not be using the correct car key. Some keys lack the precise chip needed to operate the ignition. If there are any underlying problems, address them for a simple solution on how to deactivate the anti-theft system.

Permanently Disable GM PassLock System Option #2 – Start The Car

The inability to start the car is every driver’s worst nightmare. Your engine may lock if the anti-theft system is turned on. Wouldn’t that be irksome? Disabling the anti-theft system is necessary because of this.

Check the anti-theft light on your automobile’s dashboard first; it will either be a blue or a red light. Next, turn the engine on with your key and leave it there for ten to fifteen minutes.

The anti-theft light should now be checked once more to see if it is blinking or not.

If the light has already gone out, twist the key to the off position and leave it alone for an additional two to three minutes. Retrying should get the ignition going. If the process doesn’t work the first time, keep trying it. The trick is probably going to work!

Permanently Disable GM PassLock System Option #3 – Using Your Key With The Car Door

First, place the key into the driver-side car door. If you have keyless entry, use the physical key this time instead if you have them. To unlock the system, turn the key, but keep the keys inside. Give the key another 20 to 30 seconds in the keyhole.

PassLock Relearn Not Working

For the PassLock anti-theft mechanism to operate, a key must be in the lock cylinder. A revolving magnet and a stationary Hall Effect sensor are both present in the lock cylinder. The magnet generates a signal on the Hall Effect sensor when the key is turned in the lock cylinder.

The body control module (BCM) or instrument panel cluster (IPC) are the recipients of the cylinder’s coded signal. The IPC/BCM will send a message over serial data to the PCM informing it that the car may be started if it receives the anticipated coded signal. To retrain a PassLock system, ensure the car’s battery is completely charged.

Without the alternator being able to recharge it, the battery will be used for 30 minutes. To ensure power is available when programming, connect a battery charger to the battery. The PCM and IPC/BCM must cooperate and communicate with one another.

Follow this to PassLock Reset:

1. Start the engine.
2. Turn the key to the “ON” position.
3. Pay attention to the “SECURITY” light. The “SECURITY” indicator light will go out after 10 minutes.
4. After waiting 10 seconds, turn the ignition to the “OFF” position.
5. Try starting the car, then turn the key to the “ON” position.
6. Observe the “SECURITY” indicator light. After 10 minutes, the “SECURITY” indicator light will turn off.
7. Repeat it two to three times.
8. The car is now familiar with the new password. Start the car.
9. Use a scan tool to erase any error codes.

For most cars, a single 10-minute cycle will be sufficient to teach the car the new password. If the vehicle doesn’t start after one cycle, carry out all three. The majority of trucks will need all three rounds to learn the password.

GM PassLock Bypass Instructions

Following are the GM PassLock 3 bypass instructions.

1. Take off the steering column’s top and bottom shrouds.
2. Find the White, Black, and Yellow 3-wire ribbon cable that comes from the ignition switch. These wires are THIN.
3. On the LEFT side of the steering column, directly above the ignition switch location, is the Black 6 position connector. The “Bulb Test” connector has a BLACK (Thin) wire that displays GROUND when the ignition is off, OPEN when it is in the “Run” position, and GROUND when it is in the “Crank” position.
4. Position the ignition switch to “Run.” Do not start the engine.
5. Strip both ends of the thin yellow wire.
6. Make some of the copper visible without cutting the black wire.
7. Measure the distance with an ohmmeter from the Yellow wire’s ignition switch end to the exposed Black wire and record the result. To ensure you get the correct value, take many measurements.

The Requirement For Bypass Theft Deterrent Module

The owners may occasionally need to undertake a bypass of the Passkey III theft deterrence module. The following circumstances may induce you to do a Passkey III theft deterrent module bypass.

• Your car suddenly stops functioning.
• The alarm light comes on.
• Your car might start one day and run just fine the next.
• It kicks on for a few seconds before ceasing to work.
• The engine’s primary parts are all in excellent shape; however, the ignition is broken.

Passkey Bypass Process

The Passkey III theft prevention module bypass procedures must be followed.

Permanently Disable GM Passlock System, Passkey Bypass Step 1: Estimate The Resistance

It is necessary to determine the resistance between particular wires in order to effectively do the Passkey III theft deterrent module bypass. Your lock cylinder has two wires: a yellow wire and a black wire. The yellow wire, which terminates in the ignition switch, is directly connected to the body control unit. The dark one, however, is where the sensors are.

It is required to use an ohmmeter to measure the resistance existing between these wires. You can determine its value with the use of the Passkey system’s sensor. It is impossible to obtain precise measurements if it is not functioning properly. You can successfully overcome the theft deterrent module on the Passkey III with the help of the resistance value.

Permanently Disable GM Passlock System, Passkey Bypass Step 2: Lock Cylinder Removal

To access the security system, you must remove the lock system. You can undertake the bypass of the Passkey III theft deterrent module there. There are many approaches, but using the key is probably the simplest.

Your automobile will now be in accessory mode once you turn the key in the ignition. Pull the lock up and slightly downward-press the key. Out of the ignition will come the lock cylinder. However, you will need to disconnect the steering wheel if these measures do not work. Ensure no electrical signals are running through the car and unhook the battery. The steering wheel cover bolts must then be unscrewed.

You may remove the steering wheel and see the lock cylinder after removing the covers.

To complete the process, you must also unplug a few switches, including the ones for the horn, wipers, and indicators. If they stay linked, they can unintentionally activate.

Permanently Disable GM Passlock System, Passkey Bypass Step 3: Attach The Resistor

You can locate the exact resistor for measurement using the meter’s resistance reading. You should purchase a 500-ohm resistor if the numbers are close to 500 or 520. The two wires are readily accessible in the lock cylinder. There is no need to trim or separate them.

To efficiently connect these wires, just remove the insulation. Attach the black wire after connecting the resistor to the yellow wire. It enables you to rewire the signals sent by your ignition system to the body control unit.

You will succeed in bypassing the Passkey III theft deterrence module as a result. Following the resistor attachment, you must wait for 10 to 15 minutes. It takes some time for the entire system to change where the signal originates.

The resistor now creates the coding needed for the body control module to transmit the signal wave. It starts the engine after going through the theft-deterrent mechanism. You can check the resistance value once more using an ohmmeter after bypassing the Passkey III theft deterrent module is complete.

Another indication that you have accomplished the Passkey III theft deterrent module bypass is the presence of a number.

Chevy Colorado Ignition Switch Recall

The Chevy Colorado ignition switch recall was related to the switch’s inability to start the engine. The car’s starter is near the engine’s top, below the intake manifold. A little motor called the starter is used to start the car’s main engine. As a result, the engine is started, and combustion is maintained. The car won’t start if the starter is damaged; however, you might hear a clicking sound when you turn the key.

You may anticipate spending between $300 and $500 on a new starter for your automobile, with parts costing about $300 and labor costing $200. It will take around an hour and a half if you have to remove it yourself. You’ll also need a wrench to do this.

Because of a faulty ignition switch that might turn off the engine and airbags while the car was moving, GM recalled 2.6 million compact cars at the beginning of 2014. This was the major, contentious recall; the ignition-switch issue has been cited as a contributing factor in at least 97 fatalities.

GM will replace the switches free of charge, providing impacted drivers with free loaner cars in the interim. All vehicles produced before 2008 had a flawed ignition switch. For vehicles manufactured in 2008 and later, GM apparently changed the switch, although some of those later models may have unintentionally received faulty replacement switches when they went in for repairs. So, those vehicles were also recalled.

Remote Start System Installation on 1996 and Newer GM Cars and Trucks: Facts to Know

• General Motors (GM) replaced their Vehicle Anti-Theft System (VATS) with the Pass-Lock system in 1996 for their N & J body cars, such as Pontiac Sunfire and GrandAm Passlock-1, Chevrolet Cavalier Passlock-1, Buick Skylark Passlock-1, and Oldsmobile Achieva Passlock-1.
• To remotely start a GM car or truck with Pass-Lock, you must bypass the system, which can be done either permanently or temporarily by introducing relays into the system.
• Pass-Lock II is found in 1997 or newer Chevrolet Malibu Passlock-II and Oldsmobile Cutlass Passlock-II and all trucks, SUVs, and vans from 1998 or newer.
• There are two types of Pass-Lock II systems, which require different bypass procedures.
• The Pass-Lock I bypass procedure involves cutting the thin yellow wire in the ignition switch and measuring the resistance values with an ohmmeter before acquiring the same size resistor and 3 relays to perform the connections.
• The Pass-Lock II bypass procedure involves locating two thin wires, orange/black (or black) and yellow, and cutting the yellow wire to strip back some insulation from the orange/black (or black) wires. You then need to measure the resistance values in the “Run” and “Crank” positions to determine which method to follow.
• It is important to pay attention to the resistor’s value to be measured accurately with a multimeter and purchased within +/- 5% of the same value from Radio Shack or use a Potentiometer (POT).
• The bypass procedures for both Pass-Lock I and Pass-Lock II involve finding and cutting the thin yellow wire, but the connections and measurements required are different.
• Three relays are needed for the Pass-Lock I bypass procedure, while the Pass-Lock II bypass procedures require two relays and a resistor.
• Standard automotive 5 pin SPDT relays are available from IEI for both Pass-Lock I and Pass-Lock II bypass procedures.

FAQs: Permanently Disable GM PassLock System

Here are some popular FAQs:

How To Bypass Theft Deterrent System

Look for a button that enables you to slide the actual key out of the fob. Rotate the car key to open the door without opening it. Keep the key in this position for 30 seconds. By doing so, you’ll let your car’s security system know that you have the right key and can disable the alarm.

How To Bypass Chevy Ignition Switch

The group of wires that enters your ignition switch should be located. At least three wires are present, while most autos have more. Terminal 30 (+ 12 V from the battery at all times), terminal 87a (the start signal to the ECU), and terminal 86 are the most crucial ones for this instruction. Place the tester’s tip on the wire’s end and firmly press down. An audible beep indicates whether there is a connection. Until you find the correct wire, repeat this procedure for each wire. The insulation may then be removed, and it can then be connected to our new tail light assembly. In order for the motor to turn on, the wire must only be attached to the third terminal; however, once the car is moving, it must be disconnected once more. The third terminal powers the ignition coil.

Does Autozone Replace Key Fob Batteries

AutoZone does offer key duplication services for cars made by Toyota, Ford, Honda, Dodge, GMC, Mercedes, Kia, and other manufacturers. These services include key duplication, transponder keys, key fobs, and vehicle key blanks.

How Do I Permanently Disable Anti Theft System

Don’t let the key go after turning it to unlock your automobile door. For 20 to 30 seconds, maintain this position for the key. By doing so, you can disable the alarm system and let the system know you have the right key. Some vehicles can identify the key by simply rotating it in the door lock key cylinder.

How To Bypass Chevy ABS Module

Remove the battery gently by opening the hood. Track down the ABS fuses. Remove the fuses one at a time with your fuse puller tool. Remove any ABS relays you find, and you’re good to go. By removing the ABS fuses and relays, you were able to successfully disable the ABS brake on your car. Using the necessary tools, reattach the fuse box and relay panel covers. The final step is to reconnect the battery. Take the negative connector and carefully connect it. After completing the aforementioned steps, close the hood so that your car is ready for driving.

How To Bypass VATS Without Key

It won’t matter at all what kind of key you use if you VATS bypass. Any key, as long as it is properly cut, can be used. A locksmith can make you a key if you want to keep your VATS.

How To Disable Saturn Security System

The most popular technique for disabling the Saturn security system is by using a key fob. Holding down the alarm button while standing close to your car should disable the anti-theft system. A small bump on your car could make it appear as though someone is trying to get through. In that scenario, you must press the alarm button on the key fob to reset it.

How To Reset Anti Theft System Chevy Silverado

Turn the ignition key. Make an effort to start the car. The engine won’t start, and the security light will start flashing if there is a problem with the anti-theft system. Till the security light stops flashing, keep the key in that position. It ought to take just five minutes or so. Turn the ignition key to the off position once the light has stopped. Allow a few seconds. Retry trying to start the car. Now it ought to turn over without any issues.

How To Start A Chevy Truck Without The Key

In some models of Chevy with particular ignition systems, you can just start it with a screwdriver. Hotwiring the ignition is another way to start it without a key.

How To Hotwire A Chevy Truck

To hotwire a Chevy truck, it is necessary to unscrew and remove the panel covering the ignition system and steering column. Typically, the screws are found just beneath the steering wheel. The wires linked to the ignition system must then be unplugged. Connect the two red wires after stripping them. The brown wires should then be stripped, connected, and disconnected before starting the engine.

What PassLock System Do I Have

The instrument panel of the majority of vehicles with PassLock is fitted with a telltale indicator. The PassLock warning light on the instrument panel illuminates when the vehicle’s engine with PassLock is about to start.

How Does PassLock System Work

A unique transponder key that communicates with a receiver next to the lock cylinder is the basis for several vehicle security systems. The GM PassLock system does not use transponder keys. Instead, the lock cylinder must be turned with the proper key cut. The lock cylinder will rotate if the proper key cut is applied. However, GM is aware that the majority of auto thieves utilized a slide hammer to remove the lock cylinder from the lock cylinder case before starting the car with a screwdriver. As a result, the PassLock system focuses on spotting the actual removal of the lock cylinder.

What Does A Car With A Lock Symbol Mean Chevy

The lock and car symbols, as well as the warning light, are indicators that the anti-theft system is active. You can find additional information on how to reset this light in your owner’s manual. This may be also the root of the battery’s unsustainable consumption.

Final Verdict: Permanently Disable GM PassLock System

For various reasons, your anti-theft system could malfunction, and there are instances when you’ll need to be able to turn it off. Fortunately, now that you’ve read how to permanently disable GM PassLock system, you know a few techniques for turning off your anti-theft system. You can turn it off with the key fob button, or you might have a weak battery in your key fob. Make sure you are using the correct key and that the door lock cylinder isn’t damaged if it isn’t those two things.

After making sure these two things are in order, you can try to reset the system by inserting the key into the ignition or the door lock. The final step to reset the system after trying both of those is to detach the battery. Assuming that resolves the issue and prevents it from happening again, you should get your anti-theft system looked out for because it may be really frustrating when it isn’t functioning properly.

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