Mongoose alarm locks the engine, how to remove the lock

The alarm is blocking the engine: how to remove the blocking

Engine start blocking is a function that is on the list of available options in almost any anti-theft system. In this case, the system contains an immobilizer that identifies the owner by a special tag and allows the engine to start. Conventional car alarms that have a similar function in their arsenal can also block the engine from starting.

According to experts who work with automotive electrical equipment, more than half of all cases of unexpected engine failures to start are directly related to car alarm malfunctions. Note that the complexity of implementing locks in this case is noticeably simpler compared to complex anti-theft solutions. This significantly increases the chances of removing the engine start lock yourself in the event of a breakdown or malfunction. Next, we will look at what the driver should do if the alarm blocks the engine from starting.

Engine blocking with car alarm

If there are installed anti-theft systems, electrical equipment is responsible for blocking the engine start. Immobilizers or car alarms may be faulty and cause constant or occasional failures during operation.

It should be added that the severity of the problem will depend not on the specific model or brand of car, but on the complexity of the installed anti-theft security system.

Accidental activation of the engine lock function

First of all, carefully study the displayed icons on the alarm key fob. A common cause of blocking is accidental activation of additional functions. It is also necessary to monitor the readings of the LED indicator light (if equipped) in the vehicle interior, which serves as a light indicator of the alarm status. Flashing LED lamps in most cases indicate that the anti-theft function of the immobilizer is activated in the menu.

If, after turning the key in the lock and turning on the ignition, the warning lamp blinks frequently (for example, the StarLine car alarm) before starting the engine, and a pictogram with the inscription “immo” is displayed on the key fob itself:

1. One way to solve the problem is to remove the key from the lock, after which you just need to press the button to open the central door lock on the key fob.
2. You can also get out of the car, set the alarm to security mode, then disarm it and then start the engine.

Instructions for use

The rules for using the device are simple, detailed instructions:

• pressing the button 1 - a siren signal sounds, the headlights flash, the doors are locked, the engine unit turns on;
• unlocking and disarming is also performed by pressing the button. 1;
• holding the book 2 for 3 seconds triggers an additional alarm output: the trunk lock and other electrical devices are controlled;
• auto-arming is triggered after turning off the engine and closing the doors after 30 seconds, but it must be programmed in advance;
• you can protect the key fob from accidental pressing: 30 seconds are given. to open the doors; if this does not happen, the doors will be locked again.

This operating scheme is used on Mongoose 750 and other devices. Carefully study the separate instructions for the Mongoose alarm system to understand the functions and capabilities and configure the system correctly.

The Mongoose brand alarm is configured as follows:

1. The ignition turns on after 5 seconds. you need to press Valet. 2 short, 1 light signals are emitted.
2. Press the book. 1. You will hear 2 short beeps, then 1 more - as confirmation of activation of the remote control.
3. The 1st action is repeated for each key fob. The set includes up to 4 remote controls.
4. wait 10 sec. The system will exit programming mode - the alarm can be used.

Before you can set up the device, proper installation is required. The Mongoose car alarm wiring diagram is simple only for a professional, but an ordinary car owner can do it with enough experience.

Recoding the Mongoose AMG 700 key fob (video):

Disabling locks using the service button in the cabin

If there are no signs of unintentional activation of engine start interlocks, you can try to unlock the engine using the service mode. This mode is called Valet and is used to transfer the system to service mode. To activate, you need to insert the key into the ignition, turn on the ignition and then turn it off.

After this, you need to hold the service mode activation button for about 10-20 seconds. The result will be a notification using a special short signal, after which the signal lamp (indicator light, LED) will be constantly on. This method means disabling all security functions, which may also mean removing the engine locks. We add that after fixing the problem, it is necessary to activate the security functions of the alarm again.

Independent troubleshooting of alarm systems

• It is often possible to fix the malfunction and remove the engine lock yourself if you can detect blown fuses. This problem often leads to malfunctions of the alarm system. The fuses must be checked; if a problematic element is detected, the blown fuse must be replaced with a known good one.
• Malfunctions in the operation of the alarm can also be associated with insufficient battery charge or loose terminals on the battery contacts. In this case, the battery is still able to sluggishly crank the starter, but the engine blocking may already work and further prevent the engine from starting.

• Another step is to check the limit switches (limit switches), which are located under the hood and trunk lid. Moisture ingress or oxidation of the limit switch often causes an incorrect signal to the alarm control unit, which leads to engine blocking. Please note that unprofessional installation of alarms and limit switches, as well as improper engine washing can lead to malfunctions of electrical equipment.

Tips and tricks

If attempts to remove engine locks and start the engine are unsuccessful, then there is a high probability of a serious malfunction or failure of individual alarm elements. The result is random activation of engine locks, which cannot be disabled using standard methods. The faulty car must be taken to a service station, as removing the lock will require professional intervention.

The specified delivery can be carried out by tow truck. Another affordable way is to call an auto electrician who works on-site. Note that the final costs of paying for the service of on-site engine unlocking, disabling the car alarm, emergency opening of locks, etc. often turn out to be less than delivering the car to a service center by tow truck and paying for repairs at a technical center.

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How much does it cost to turn off the alarm system?

Cost of alarm deactivation and additional services

Tariffs for disabling alarms and additional services depend on the brand of alarm and factors associated with the breakdown.

How to disable Mongoose alarm

A professional anti-theft alarm system from the Mongoose brand is the key to reliable protection of the car from all sorts of troubles associated with theft or other actions by intruders, which also has a positive effect on the ease of use of the vehicle.
It can be installed on a car of any make and model, including vases. It may happen that the alarm key fob is lost, discharged, or the alarm system simply does not respond to the key fob.
In this case, you can choose one of two options. First, call a tow truck and head to the service station. However, if you do not have enough time or are several tens of kilometers from the nearest service station, you can use another method, namely an emergency shutdown. If you follow all the instructions exactly, then in just a few minutes you will be able to continue your intended route.

Signaling capabilities

Check out the main features and capabilities of Mongoose car alarms.

The main functionality of the Mongoose brand alarm:

• silent security - alerts come in the form of light signals and user alerts;
• delayed security - protection is activated only after closing the doors, including the trunk;
• autostart of the engine - the parameters at which the engine turns on (temperature, time) are set;
• Anti-Hi-Jack. Engine blocking while driving (when trying to steal a car, the mode is activated from the key fob;
• emergency shutdown - the PIN code protection is removed.

Control is carried out using a key fob. The alarm is started from a radio transmitter powered by 12V batteries - the service life is about 12 months. There are 2 buttons and an LED on the body. If you click on any of the controls, a signal is sent. A special feature of the key fob is its built-in processor, which is capable of changing radio commands according to a specially developed anti-theft algorithm. Therefore, an attacker will not be able to intercept the signal.

The LED responds to commands and signals the need to replace the battery (the brightness changes). The standard alarm system includes 2 frequency 433.92 mhz key fobs, which work identically.

How the indicator works:

• blinking - successful car blocking;
• continuous light - activation of Valet mode;
• lack of light - Mongoose car alarm is turned off;
• short flash - delay during auto-arrangement;
• series of flashes - 2 (shock triggered), 3 (door opening), 4 (hood/trunk opening);
• slow flash - ignition feedback.

Removal methods

Depending on whether a PIN code has been assigned to the system, emergency shutdown of the alarm can occur in two modes: simple and coded.

If, when using a simple method, the key fob does not open the doors, but simply makes some sounds, you need to open them with a key. After this, the ignition is turned on and the emergency shutdown button is pressed - Valet, which is located somewhere at the driver’s feet or near the small glove compartment. If the button is located in some other place, it can be found by following the wires that lead from the alarm unit. Please note that once the door is opened, the alarm will go off automatically.

In coded mode, the alarm can be cleared in two ways:

1. If the alarm code consists of only one digit, you must turn on the ignition and press the button several times. The number of presses must correspond to the code number, after which the ignition is turned off.
2. In the case of a two-digit code, you must first do the same as in the first case, then turn on the ignition again and enter the second part of the code in the same way. You must be very careful, because if you enter the wrong code twice, further entry will be blocked for two minutes. This will be indicated by double LED flashes.

It is worth noting that disarming without a key fob in encrypted mode may differ depending on what version of Mongoose is installed on the machine.

In order to unlock the Mongoose IQ-215 alarm, open the car door with the key, after which the alarm should sound. Turn on the ignition, and then press the button that is responsible for emergency removal of the alarm a number of times equal to the digit of the lock code. The ignition can now be turned off. If everything went well, these manipulations will be followed by several sound and light signals.

Alarm connection diagram

The device is installed in accordance with the algorithm:

1. installation of siren, sensors, receiver, control unit;
2. connection using wires;
3. connection to the main electrical elements - window regulators, locks, headlights, turning lights;
4. testing is in progress.

The connection diagram is clearly shown in Fig.

Installing an alarm on a VAZ 2110 (video):

Each device has its own control panel. Alarm Mongoose 600, for example, has 2 buttons (lock/unlock). They correspond to icons with an open and closed lock. They may have a different appearance - on and off signs.

The alarm system of the Mongoose 750 brand and some other models has 2 buttons - arming/disarming. Other models may have up to 5 buttons. They provide trunk release and other functions, depending on the device.

The instructions supplied with the alarm system with the frequency 433 mhz key fob are required reading. This will help ensure safety and eliminate the risk of unlocking due to the inexperience of the car owner.

Key fob failure

If the key fob is broken, after the alarm has been successfully unlocked, you still need to visit an auto electrician so that he can completely reprogram the key fob. There is no need to install a new alarm.

Overall, Mongoose alarms are reliable and problems are extremely rare. If such a problem occurs, try not to panic and follow all our instructions exactly.

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Blocking by security complex

Starting problems arise as a result of the fact that security systems are implemented in the power plant control circuits. This is done to prevent the car from being stolen if an attacker was still able to get into the cabin. In practice, this is implemented by installing intermediate relays (controlled by an alarm) in the open circuit of the starter, fuel pump or ignition power supply circuits. If one of these components is not supplied with voltage, starting the engine will not be possible.

Electronic components included in modern security systems begin to malfunction over time, making it difficult to access the car or preventing the owner from starting the power unit. Experts list the following as the main reasons for refusal:

1. Damage to the onboard electrical wiring supplying the security system.
2. Failure of the immobilizer blocker installed in alarm systems with the ability to remotely start the engine.
3. Failure of the electric relay blocking activation of the starter, fuel pump, ignition system.
4. Unauthorized entry into a vehicle or attempt to steal it.
5. Violation of two-way communication via the CAN bus.
6. The appearance of errors in the firmware.

If the alarm system blocks the engine from starting, when the ignition is activated, the characteristic sound of the starter or the engine “grabbing” is not heard. Separately, the list of possible failures includes a low charge of the key fob batteries. In this case, it is possible to disarm the car, but the engine will not be able to start. This happens due to a violation of the code signal transmission - the door locks will open, but other functions will not be active.

Interruptions in the operation of any car alarm can begin within 5 years after installation. The increase in service life depends on the quality of the system installation.

Ways to disarm a car

Before you begin to remove the engine lock, it is necessary to determine what exactly caused the failure. Electronics can notify the driver of failures with service messages or incorrect operation:

1. The indicator light (LED) is flashing at an unusual rate. Its uncharacteristic mode of emitting light pulses indicates possible problems with the firmware.
2. The presence of a pictogram on the LCD display of the key fob about arming the car. In this case, a notification is sent via two-way communication that some functions are not available.
3. Continuous sound siren and hazard warning lights. The inability to disarm the car indicates that the protection is activated and the engine will not start.
4. Abnormal operation of the key fob. If, when you press a certain button, another, unprogrammed action occurs, this indicates a malfunction of the electronic components of the head unit or remote control.
5. Lack of response to pressing key fob buttons. If this happens on all existing remote controls, then the head unit has mechanical damage.

To restore the functionality of the car alarm, the driver should try to reset it to factory settings. The process is individual for each type of security system; the sequence of actions is indicated in the accompanying documentation. Along with the installation kit there is a brochure, which it is advisable to keep in the car. If the booklet is lost, the user manual can be downloaded from the Internet or a search request can be made.

If the alarm goes off, you can remove the block using the secret VALET button. This is a standard operating algorithm for all types of security systems. The button is needed to enter the service mode, reset settings or completely disable protective functions. To prevent attackers from using it, it is hidden in the internal cavities of the dashboard, and access to it is possible after dismantling decorative panels, plugs or other controls. As a rule, the button is located in the area of ​​the driver’s left knee, but individual installation cannot be excluded when the master places it in a place previously agreed upon with the owner.

When buying a used car, you should definitely find out about the location of the VALET button, as well as the contact details of the workshop where the installation was performed.

Ways to turn off the alarm

Emergency shutdown of the anti-theft system provides a number of alternative methods and techniques that will help the car owner emerge victorious from this situation.

So, let's look at the most effective methods for de-energizing a car's protective systems in various circumstances.

From keychain

The most simplified option in this case involves using a standard key fob. If the main remote control has died for a long time, you can always use a spare one, if available. Disabling the alarm using it involves the same actions as when using a standard remote device.

Difficulties arise when the location of the spare key fob is unknown. This state of affairs forces the driver to resort to other, more radical methods of solving the problem.

By de-energizing

The presented method of deactivating the anti-theft system includes a number of operational actions. Namely:

• disconnecting the battery terminal;
• de-energizing/dismantling the ignition switch control wire;
• dismantling the blocking relay.

It is worth noting that in some cases finding a power relay is not an easy task. Often, for safety reasons, when installing an alarm system, the relays are located in hard-to-reach places

Using a secret button

Emergency shutdown of the anti-theft system involves the use of a so-called secret button called “Valet”. Activating it allows you to transfer the system to the so-called service mode.

If the owner has difficulty finding it, just find the control indicator - a flickering red light. This treasured button is also installed somewhere in the immediate vicinity.

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So, the sequence of actions in this case is as follows:

• de-energize the car by disconnecting the “+” terminal of the battery;
• turn off the power to the sound siren;
• put the terminal in its rightful place;
• set the key to the “KZ” position;
• make one click on the Valet button;
• turn off the ignition.

The presented procedure for different types of anti-theft systems is strikingly different. In some cases, to obtain the desired result, it is necessary to make up to 6 short presses on the specified button.

In any case, before adopting this technique, it is advisable to read in detail the instructions for a specific type of alarm.

Coding

Another trick for car enthusiasts is the so-called coding. Its essence lies in the fact that to unlock the anti-theft system, you must enter a special code.

The presented procedure consists of the following steps:

• turning off the siren;
• circuit closure “short circuit”;
• activation of the service button;
• turning off the ignition.

Depending on how many symbols a particular PIN code contains, the above procedure is repeated for the same number of times. The PIN code is entered by pressing the service button. So, to enter 4, you need to press 4 times, etc.

Troubleshooting

If software methods fail to start the engine, then the fault lies in mechanical damage to the components of the security system. The work can be done on site, but it is better to have the car towed to a garage. First of all, it is necessary to determine the alarm operating algorithm. When installed normally, it can block the motor through several channels:

1. CAN bus with complex programming of modes.
2. There is an open circuit in the starter push coil power supply circuit.
3. Fuel pump blocked.
4. Turn off the ignition and injectors.

There are other types of blocks that are placed individually or handicraft. Often such algorithms are forgotten, and it becomes extremely difficult to bypass them. First of all, take out the control unit and related elements. They are located behind the fuse and relay panel to the left of the steering column. The location is extremely inconvenient due to limited access and confined space.

It is better to remove the head unit and peripheral components from the niche in which they are located. The length of the connecting wires is sufficient to move all elements of the security system to a distance sufficient for comfortable operation.

First, check the fuses that protect the electrical circuits of the car alarm. They are located on wires in special sockets at a short distance from the head unit. A blown fuse should be visible: a thin current-carrying wire behind the plastic partition will be destroyed. If it appears intact, check the integrity of the component with a multimeter. When you don’t have the necessary equipment at hand, you can replace all fuses with known good ones. Then check the operation of the alarm.

The problem may lie in poor-quality connection of the security system wires with the standard electrical wiring of the car. In order for the alarm system to prevent car theft, the power supply circuits of the devices responsible for starting or operating the engine are interrupted by blocking relays. If the connection is not made well, the conductors may oxidize and lose contact. When troubleshooting, you need to remove the old insulation on all twists and reconnect.

In the case when the blocking is carried out via the CAN bus, you can try to disconnect all the connectors suitable for the control unit and relay. Motor protection is provided by normally closed contacts. After disconnecting the connectors, try to start the engine. If this does not help, you need to find all the relays connected to the control unit. They are located in close proximity to it, can be attached to its body or simply hang on the wires.

To bypass the blocking, you must manually close the relay contacts. On the body of the latter there is a diagram of the operation and switching options. You can also use a multimeter to look for open contacts. The contacts are closed by bridging them with a thin wire. You need to be extremely careful not to short-circuit the portals of the relay power line, which will lead to a short circuit and blown fuse. As a last resort, you can carefully open the plastic case. Below it there will be an anchor that must be pressed to restore the integrity of the chain.

Nuances of alarm operation

The latest generation security systems are complex electronic components that include a number of functions that make it difficult to access or steal a car. But incorrect operation can create a problem for the driver himself, when the locks on the doors refuse to open or the engine cannot be started. A periodic inspection of your car alarm will help you avoid an emergency situation.

To receive prompt assistance, you need to have the installer's contact information with you. They can be stored in the car and the notebook of the smartphone.

Car alarms will last longer and without failures if they are installed in specialized workshops. In addition, you must follow a few simple rules:

1. Do not check the serviceability of fuses or relays while away from home or a parking lot. Accidental damage to components can cause the power plant to lock up.
2. Change the battery in the key fob promptly. If the remote control operating distance decreases, this is a sign that the battery is depleted.
3. In case of minor malfunctions in the operation of the security system, it must be immediately turned off, diagnosed, repaired, or replaced with a new one.
4. Do not allow moisture to enter the control unit and relay. Oxidation of contacts can completely damage the system.

Whatever anti-theft system is installed on the car, electrical equipment is responsible for blocking the engine or starter. This allows you to narrow down the troubleshooting area for starting the engine. Success depends on the type of alarm installed and the number and complexity of interlocks. In some cases, you may need the help of an auto electrician so that your actions do not cause more damage to electronic components.

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When might you need to turn off the alarm without a key fob?

There can be a huge number of situations when it is necessary to resort to such a procedure. The main thing is that the car owner has a key that can open the car door lock without breaking anything. We will not post information about how you can get into a car without a key, because such data can be used for criminal purposes. Disabling the alarm does not pose a problem for an attacker, but in the case of an ordinary driver it is a problem. It is necessary to use methods for emergency stopping of a siren in a car in the following cases:

• the key fob for the alarm is lost - in such a situation you need not only to open the car and turn off the alarm, but also to quickly replace the security device;
• The batteries in the key fob are dead, and there is no way to buy them nearby;
• the battery in the car is dead, which does not allow you to use the functions of the car’s electrical system;
• The alarm system has broken down and performs its tasks in a very strange way, turning on for no apparent reason.

In these cases, it is simply impossible to use the car without turning off the alarm, so you must resort to one of the methods of restoring the system’s functionality or disabling it. The driver often does not have the time or desire to delve into complex electrical systems, so he has to turn off the alarm to make it possible to further operate the car. There are several ways to silence the alarm for a certain period of time.