VW / Audi Bosch ABS module removal instructions
The most common problem with the Bosch 5.3 ABS system is the controller module (ECU). The good news
is you can seperate the module from the pump relatively easily while its on the car. This means you are
not required to break into the break hydraulic system to remove the just the module (leaving the pump on).
The following instructions are generic and will vary from car to car. ABS pump/module locations:
Q. Do I need to send the whole pump in (for an own unit rebuild)?
A. No. The module is the common failure 99% of the time. This can be seperated and sent in on its own.
Q. Can I drive the car while the module is being rebuilt?
A. Yes. As the pump stays on the car, you are not breaking into the hydraulic fluid brake system. Your normal non-ABS
brakes will still work. However, you will not have ABS / TC!! Take extra care when driving.
Q. Will I need special tools to reinstall / code my rebuilt module?
A. No. The fault codes will be cleared upon re-installation. Also, your module retains its coding, so there will be no need to recode it.
First, disconnect the negative battery terminal (note your radio code if required).
The pump is usually located on the driver's side of the engine bay (passenger side for the UK). For best access,
remove the relevant front wheel.
Remove the plastic guard to gain access to the windscreen washer bottle. Loosen this for improved access to
the pump and modulator.
Once you have good clearence, unplug the power connecter first. This plug has two wires going from the module
to the rear of the pump. Prise the retaining clip away from the modulator and wiggle the plug free (see pic)
Next, remove the main harness by pulling the main clip outwards (see pic). This will prise and lift the connector
Now, remove the six torx screws holding the module on the pump.
Now you can seperate the module from the pump. Gently prise the module off, being careful not to damage any
of the solenoids and delicate electronics inside.
Wrap the module in a bag. Protect it in bubble wrap or foam packaging and send to us in a strong sturdy box.
Don't forget to include contact details!
You will also need to cover the exposed side of the ABS pump (2) from dirt and water. Wrap and tape tightly.
Refitting is a reverse of the procedure. Carefully line up the solenoids (1) with the valves (2) when refitting.