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ABS Dynamic Control Module Replacement
 
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Pelican Technical Article:

ABS Dynamic Control Module Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$650

Talent:

**

Tools:

T20 Torx driver

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

New ABS control module

Hot Tip:

Take care not to spill brake fluid

Performance Gain:

Proper braking

Complementary Modification:

Bleed the brakes

There are two pieces that make up the ABS control unit: the Dynamic control module and the hydraulic control unit. This article will show you how to replace the dynamic ABS control module. The ABS control module gets signals from not only the braking system and wheel speed sensors but also the steering sensor and other sensor throughout the vehicle to work in tandem with the other stability control units.

Some people claim that the interaction of the ABS system, when not warranted, is a sign of the control module going bad. More likely it is usually a sign of a failing wheel speed sensor. The only sure way to tell if the control module is failing is the ABS warning light in the dash and then reading the error codes.

Replacing the unit is simple and quick. Just make sure to pay attention to the wiring connections when working on the unit.

There are two pieces that make up the ABS control unit: the dynamic control module (red arrow) and the hydraulic control unit (yellow arrow).
Figure 1

There are two pieces that make up the ABS control unit: the dynamic control module (red arrow) and the hydraulic control unit (yellow arrow). The two units are connected and located at the front left of the engine compartment.

You need to separate the wiring connection from the control unit.
Figure 2

You need to separate the wiring connection from the control unit. Begin by lifting off the protective cover (red arrow) from the wiring connection (yellow arrow).

When separating the wiring connection for the control unit it is very important that you do not damage the clip on the harness, as this can cause the harness to not lock into place when reinstalling.
Figure 3

When separating the wiring connection for the control unit it is very important that you do not damage the clip on the harness, as this can cause the harness to not lock into place when reinstalling. Never use tools to disconnect the harness and never force it. If you are forcing it you are doing something wrong. Release the clips on the bottom of the connector (red arrow), and pivot the connector up towards the top 90 degrees.

This photo illustrates the connector hinge (red arrow) when it is raised 90 degrees.
Figure 4

This photo illustrates the connector hinge (red arrow) when it is raised 90 degrees. This will start to "walk" or push the harness out from the control module.

With the hinge all the way up you can pull the connection straight back and apart.
Figure 5

With the hinge all the way up you can pull the connection straight back and apart. There are a lot of small electrical pin connections in the harness so make sure it is properly lined up when reinstalling so as to not damage it.

To remove the unit, remove the left side air inlet duct by compressing it towards the front of the vehicle (red arrow) and slipping it off the intake cover.
Figure 6

To remove the unit, remove the left side air inlet duct by compressing it towards the front of the vehicle (red arrow) and slipping it off the intake cover.

There are four T20 bolts that hold the dynamic control module to the hydraulic control unit (red arrows, two shown).
Figure 7

There are four T20 bolts that hold the dynamic control module to the hydraulic control unit (red arrows, two shown). Remove the four bolts.

With the bolts removed pull the unit straight back and off (red arrow).
Figure 8

With the bolts removed pull the unit straight back and off (red arrow).

Before installing the new control unit make sure to inspect the hydraulic unit (red arrow).
Figure 9

Before installing the new control unit make sure to inspect the hydraulic unit (red arrow). There should be no signs of damage, and there should be no brake fluid leaking out anywhere on the unit. Installation is the reverse of removal.

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Page last updated: Fri 12/9/2016 02:57:00 AM