Electronic Brake Control Module: Service and Repair

Brake control module (BCM), replacing

Note! As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information in the illustrations is always correct.

Preparation
Remove the battery lead. See Battery, disconnecting Battery Disconnecting.

Removing the air cleaner (ACL) housing




Remove the screws (1) for the intake manifold.
Disconnect the hose clamp (2) for the air hose.
Remove the connector (3) from the mass air flow (MAF) sensor.
Remove the air cleaner (ACL) housing from its mountings. Pull it straight up.

Removing the integrated relay / fusebox





Remove:
- the nut for the power supply cables
- the 2 power supply cables
- the 2 screws for the mounting.




Open the integrated relay/fusebox. Remove the connector (1).
Disconnect the cable harness from the box (2).
Lift the box out of the mounting and move it to one side.

Disconnecting the connector




Disconnect the connector from the control module.
Press the catch and pull up the connector. Pull up the connector a maximum of 90 °.
Pull the connector up from the control module.

Removing the control module




Remove the screws.
Use a 6 mm torx external socket.
Carefully pull the control module down so that the terminal pin on the control module comes loose inside the ABS modulator.
Continue pulling the control module down towards the brake lines and lift it out.

Installing the control module





Check:
- the control module is correct (compare to the old one)
- that none of the pins on the connector are damaged
- that there are no contaminants on the mating surfaces between the control module and the ABS hydraulic modulator
- that no parts of the old control module seals remain on the old ABS hydraulic modulator valves.
Position the control module on the brake lines.
Center the control module with the ABS modulator valves so that the terminal pins are correctly positioned in the modulator.
Press the control module up so that the terminal pins connect.

Install:
- the screws. Tighten to 1.8 Nm.
- the connector on the control module. Lock the connector.

Installing the integrated relay / fusebox
Install the box in its mounting.

Install:
- the cable harness
- the connector
- the 2 screws in the mounting. Tighten to 10 Nm)
- the 2 power supply cables
- the nut for the mounting for the power supply cables.

Installing the air cleaner (ACL) housing
Press the air cleaner (ACL) housing into place.
Install the air hoses and the connector.

Finishing

Warning! No ABS, stability and traction control functions are available when there is communication with the Brake control module (BCM) (Volvo Diagnostics are activated). ABS warning lamp flashes for as long as the diagnostics are activated. To cancel the diagnostics before test driving the vehicle, the ignition must be switched off!





Note! Switch on the ignition.

Order the software. Software Downloading
Use VIDA vehicle communication to calibrate the control module.
Visual check.
Turn on the ignition.
Wait five seconds and until the symbol for the brakes on the dashboard has gone out.
In the event of a fault (the symbol is lit).
Check that the connector is connected.
Read off any diagnostic trouble codes (DTCs) stored in the control module. Erase.
Interrupt the diagnostic function by turning off the ignition.
Test drive the car, see Test Drive Form (ABS), description Test Drive Form (ABS), Description.
Check that no diagnostic trouble codes (DTCs) are stored.
Interrupt the diagnostic function by turning off the ignition.