In detail: bmw e39 do-it-yourself abs block repair from a real master for the site my.housecope.com.
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The BMW E39 is equipped with a system that unlocks the wheels during emergency braking. This system is included in most new cars. The main function of ABS - in a critical situation, prevents the complete blocking of the wheels during heavy braking. This system also helps to better control the machine during hard braking. This mostly happens when entering a corner and also on an icy road. The ABS system includes:
Control block.
A lamp that indicates a system breakdown. It is located in the cabin on the instrument panel.
Special sensors located on BMW wheels.
An electronic device, which is located in the control device, performs the function of monitoring the appearance of problems in the system itself. In the event of a breakdown, a light on the information panel lights up, and the system itself ceases to function. Driving a car in such a situation is allowed, but with a sharp braking, the car will behave differently. Almost any BMW E39 driver can diagnose and fix problems in the system.
Video (click to play).
After starting the car, the check of the ABC system begins. At the same time, the lamp in the cabin on the dashboard lights up for 3 seconds. After the elapsed time, the lamp goes out. If the indicator does not go out, do the following:
If the car was moving, it should be stopped and the engine turned off. It should take 3 minutes. Then start the car again.
You should check the voltage in the battery - 10.5 watts.
It is necessary to check the terminals and power wires.
View all the wires that go to the sensors on the wheels.
If the bulb continues to work, you should contact BMW service professionals for diagnosis. Using a special electronic device, information is read from the block and the point of the problem is determined.
To understand that there is a problem with the E39 ABS unit, you can notice a different behavior of the car:
No communication with wheel sensors.
Installing new sensors does not solve this problem.
The order of destruction of the block according to the sensors: left - behind; right - in front; front - left; back - right.
The speedometer stops working.
Indicators on the instrument panel in the cabin are on, indicating a problem.
After the BMW has warmed up, the system switches off automatically.
ABC turns off when driving on uneven road surfaces.
Self-checking should begin with the electric sensors of the cycle numbers. The device is fixed on the hub with bolts. Therefore, the assembly with the brake disc and other parts should be removed. The bolts can be unscrewed with a special key - a hexagon, counterclockwise. For better removal, sprinkle the bolts with WD-40 (special tool - vedeshka).
After removing the sensor, disconnect the connector located on the wing at the top. You should also check the wires for integrity.If the wire is damaged, it must be replaced with a new one; twisting and insulation in this case is not suitable. The wire needs the same length and the same cross section. Sensor resistance 0.9-1.3 kOhm.
In the BMW E39 until 1999 there were no problems with the anti-lock system. But newer releases of the car have such a weak point. This is due to an unsuccessful fixation of the control unit. It is located near the power unit. To restore the hydro-electronic unit after 1999, you will need a soldering iron, rosin and tin.
The weak point of the control unit is the conductors that connect the connector to the device board. Contact is lost in this place. This is due to constant vibration, as well as sudden changes in temperature.
Remove the cover from the block with a large knife or a hacksaw.
With careful actions, you should remove the protection layer that is located on the edge of the board. It is not necessary to remove the entire layer. You need access to conductors. They are made of aluminum and run from the board to the connector. Using a regular needle, check the contact. The needle should be lightly pricked into the conductor.
The conductor is removed with tweezers or tweezers without contact. And in its place put a new one with the help of soldering. Copper wire is the best conductor. The same section and alloy wire from the mobile phone charger.
There are 16 wires connected to the connector itself. They all need to be checked. If there is no conductivity, the wire changes in the same way.
Before you install the cover in its place, use a sealant. The block returns to its place in the car. High pressure pipes and sensor contacts are connected to it.
If the ABS unit has already been repaired, then it cannot be repaired again. You should purchase a new one in a specialized store. This block should not be dropped on exploration sites. Most often it has defects.
The operation of a BMW car with a broken ABS system is allowed, but this is the safety of the driver, passengers and others.
The BMW E39, like most modern cars, is equipped with an anti-lock system (ABS). Its main task is to prevent the wheels from completely locking up when braking in an emergency. The anti-lock braking system improves vehicle control when the brake pedal is pressed hard, especially when cornering and during icy conditions. The ABS consists of the following components: a hydro-electronic control unit, a system malfunction indicator lamp located on the dashboard, and sensors on the vehicle's wheels.
The main task of ABS is to prevent the wheels from completely locking up when braking in an emergency.
An electronic device located in the control unit monitors the presence of defects in the system. If there are any, the malfunction indicator lights up and the system turns off. At the same time, you can drive a car, but when braking, it behaves as if there is no anti-lock system. Almost every BMW E39 owner can check and repair the ABS unit, including replacing sensors with their own hands. But there are differences in the models before and after restyling.
BMW E39 in 1999 has undergone restyling. The modernization affected not only the body and power units, but also the anti-lock wheels during braking. In models before restyling, the valve body and the electronic control device are spaced apart on the car body: the hydraulic part is under the hood, and the electronic unit is in the passenger compartment (behind the glove box).
Since 1999, the manufacturer has combined two blocks into one and placed it under the hood near the intake manifold. This solution turned out to be not entirely successful, because the electronic device turned out to be sensitive to temperature changes and strong vibrations. It was this design decision that became the main reason for the failure of the ABS system.
Wheel sensors have also been changed.Until 1999, the sensor was attached to the wheel hub with two bolts, and the connector was painted gray. After restyling, the sensor has one ear for mounting, and the chip is painted blue.
After turning the key in the ignition lock, the system diagnostics starts. The ABS light stays on for about 3 seconds and then should go out. If the indicator stays on for a longer time or starts to glow while driving, you should perform the following actions:
Park the car, turn off the engine. Start the engine after 2-3 minutes.
Check the voltage supplied by the battery. It should not be less than 10.5 volts.
Make sure that there is good contact between the power wires and the battery terminals.
Check the integrity of the wires coming from the sensors on the wheels.
If the anti-lock braking system light continues to burn, then most likely you will have to contact a service station and carry out a full diagnosis there. Using a special device, you can read the error code and use it to determine the direction to eliminate the defect.
ABS diagnostics should begin with checking the speed sensors. To get to them, you must remove the wheel, caliper and brake disc. The sensor is attached to the hub with two or one bolt, you can unscrew them with a hexagon. Before dismantling, treat everything with WD-40.
ABS diagnostics should begin with checking the speed sensors
After removing the ABS sensor, disconnect the connector (it is located at the top of the wing). Before checking the sensor, make sure the wires are intact. If there is damage, then the wires can be replaced. In this case, it is important that the length of the wires remains the same, and the electrical resistance of the sensor does not change. If you do not quite understand what it is about, then it is better to contact a specialist in radio electronics. The working sensor must have a resistance in the range of 0.9–1.3 kOhm.
For the BMW E39, before restyling, there are practically no problems with the ABS electronics, but the anti-lock braking system on models since 1999 is more capricious due to the unsuccessful placement of the control unit under the hood near the engine. You can try to reanimate the hydro-electronic unit from a car after 1999 on your own. For this, skills in working with a soldering iron will come in handy.
The sore point of the electronic control unit is the conductors connecting the connector and the device board. Contact is often lost in them due to frequent temperature changes and vibration. How to fix this defect, consider below.
Cut off the cover from the removed block. This can be done with a sharp knife or hacksaw blade.
Carefully remove the protective layer from the edge of the board. They cover the entire surface. There is no need to remove the entire layer. You need to get access to the aluminum conductors from the board to the connector. Picking up a needle, carefully check the contact. To do this, just poke a needle into the conductor.
Using tweezers, remove the conductor that has no contact. We solder a new one instead. It is better to take a thin copper wire. A wire from a non-working mobile phone charging cord is perfect. I'm sure many of you will find this at home.
We check the rest of the conductors. There are 16 wires going to the connector. If there is a break, solder the contact.
We install the cover on the sealant. We mount the block in the car. We connect the hydraulic pipes and sensor connectors.
If “experts” have already climbed into the control unit, then it will be almost impossible to repair it. It is better to look for a replacement immediately. It is not recommended to buy an ABS unit for disassembly.It may have defects that may show up later.
You can drive without ABS, but remember that the anti-lock braking system is an element of car safety. Take care of yourself and those around you.
