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Pelican Technical Article:

ABS Control Module Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$1500

Talent:

*

Tools:

13mm, 10mm socket, 11mm flared wrench

Applicable Models:

VW Golf GTI (1999-00)
VW Golf GTI 1.8T (2002-05)
VW Golf GTI 20th Anniversary (2003)
VW Golf GTI 337 (2002)
VW Golf GTI GLS (2001)
VW Golf GTI GLX (2000-01)
VW Golf GTI VR6 (2002-05)

Parts Required:

New ABS Control Module

Hot Tip:

Take care not to spill brake fluid

Performance Gain:

Better braking

Complementary Modification:

Bleed the brakes

Without a doubt, your brakes are the most important systems on the car. There is an ABS control module that reads the information from various sensors on the vehicle and controls brake modulation. If this control module goes bad it can cause all kinds of problems with your braking system. The ABS system will require coding and setting with a scan tool after installation. Also you can not drive the car until you have completely bled the brake system.

Replacing the ABS control module easy, which is nice, because it is very expensive.

Begin by disconnecting the ground strap from the battery and making sure it can not make contact again while you are working. Remove the air box and MAF sensor. You do not need to remove the master cylinder to perform this job but it will give you a lot more room to work. If you leave the master cylinder in place you will need to loosen the clutch slave line to remove the ABS bracket. Please see our article on each of these procedures for additional help.

Remove the relay box out of the way to give you more room.
Figure 1

Remove the relay box out of the way to give you more room. Release the plastic tab on the side (red arrow) and remove the top.

With the top off unclip the box from the wall (red arrow) and set it aside.
Figure 2

With the top off unclip the box from the wall (red arrow) and set it aside.

You'll want to try and get as much brake fluid as you can out of the fluid reservoir (red arrow) on top of the master cylinder.
Figure 3

You'll want to try and get as much brake fluid as you can out of the fluid reservoir (red arrow) on top of the master cylinder. Clean around the cap and then remove it. Using a fluid pump or turkey baster, get as much of the old fluid out as you can. This helps prevent excessive spilling of brake fluid inside the engine compartment. It's also helpful to stuff a bunch of old rags or paper towels under the master cylinder and ABS unit to absorb any spills.

The wiring harness for the ABS module is attached to it on the side by the fire wall.
Figure 4

The wiring harness for the ABS module is attached to it on the side by the fire wall. I have highlighted it in red in thisPicture to make it stand out, the unit is actually black. Undo the clip over the harness (yellow arrow).

Pull up on the top handle on the module connector (red arrow) this will separate the connector from the module and allow you to remove it from the unit.
Figure 5

Pull up on the top handle on the module connector (red arrow) this will separate the connector from the module and allow you to remove it from the unit. Swing the connector without clip on (yellow arrow) up and out of the way.

Clean the top of the ABS unit and use an 11mm flared wrench to remove the two supply lines (red arrows) from the master cylinder.
Figure 6

Clean the top of the ABS unit and use an 11mm flared wrench to remove the two supply lines (red arrows) from the master cylinder. Make sure to cap the lines and unit to keep anything from getting in them.

Use an 11mm flared wrench to remove the four lines (red arrows) coming out from the ABS module.
Figure 7

Use an 11mm flared wrench to remove the four lines (red arrows) coming out from the ABS module. Make sure to cap the lines and unit to keep anything from getting in them.

The unit is mounted to a bracket that is secured to the frame by three 13mm nuts that sit in rubber grommets (red arrows).
Figure 8

The unit is mounted to a bracket that is secured to the frame by three 13mm nuts that sit in rubber grommets (red arrows). Use a 13mm socket and remove these.

Carefully remove the module (red arrow) from the vehicle taking care to clear the mount (yellow arrow) without damaging the lines (green arrows).
Figure 9

Carefully remove the module (red arrow) from the vehicle taking care to clear the mount (yellow arrow) without damaging the lines (green arrows). I have removed the master cylinder to make it easier, if you do not want to do this you will have to release the bracket for the hydraulic line to the slave cylinder (blue arrow).

Take the unit to your work bench.
Figure 10

Take the unit to your work bench. This photo illustrates the connection point for the wiring harness (red arrow) and the three rubber grommets on the mounting harness (yellow arrows).

Flip the unit over and use a 10mm wrench or socket to remove the two bolts and separate the module from the bracket (red arrows).
Figure 11

Flip the unit over and use a 10mm wrench or socket to remove the two bolts and separate the module from the bracket (red arrows).

Use a T25 Torx to remove the two screws that hold the hydraulic unit to the module (red arrows).
Figure 12

Use a T25 Torx to remove the two screws that hold the hydraulic unit to the module (red arrows). These screws are single use only and should always be replaced.

You can now separate the hydraulic unit from the control module.
Figure 13

You can now separate the hydraulic unit from the control module. If you are covering the hydraulic unit make sure to cover it with plastic and not cloth or a rag. Fibers from a rag can affect performance of the unit.

Installation is the reverse of removal.
Figure 14

Installation is the reverse of removal. Make sure to clean up the area under and around the ABS module of any spilt brake fluid (red arrow) before beginning reinstallation.

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Comments and Suggestions:
Double Tp Comments: Where is ignition module of a caravelle
September 26, 2016
  Followup from the Pelican Staff: What vehicle? - Nick at Pelican Parts  
kida Comments: You mention removing the two torx screws in figure 12. Where do I get new replacements for them?
June 11, 2016
  Followup from the Pelican Staff: Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Toby Comments: I got on my vs golf 1.8 my abs light on, and my brake light flashing . any idea?
May 11, 2016
  Followup from the Pelican Staff: There are fault codes in the brake system. Use a scan tool to read out the fault codes. - Nick at Pelican Parts  
adrianparv Comments: After I installed the ABS module.. must bleed the ABS module with diagnosis ? brakes must be balanced with the diagnosis ?
November 12, 2015
  Followup from the Pelican Staff: Yes, you will have to code the system first. Then bleed it. - Nick at Pelican Parts  

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Page last updated: Wed 12/7/2016 02:36:18 AM