Brake Control Module (BCM), Replacing

Brake control module (BCM), replacing

Removal

Preparation

Note! In week 35 year 2001 a new brake control module (BCM) is being introduced along with a new sensor in the brake electronics.




Remove the battery cable. See Battery, disconnecting Battery Disconnecting.

Removing the air cleaner (ACL) housing
Remove the air cleaner (ACL) housing. See Brake pipe master cylinder / ABS unit, replacing Brake Pipe Master Cylinder / ABS Unit, Replacing.

Removing the integrated relay / fusebox
Remove the integrated relay / fusebox. Remove the connector for the ABS unit. See Brake pipe from hydraulic unit / front wheel / junction, replacing Brake Pipe From Hydraulic Unit / Front Wheel / Junction, Replacing.
Remove the screw on the bracket.
Lift the box out of the bracket and put it to one side.

Disconnecting the connector




Disconnect the connector from the control module.
Press the catch and pull up the connector. Pull the connector up a maximum of 90 ° (any more and the connector will break).
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.

Checking the new 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.

Installation

Installing the control module




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
- the integrated relay/fusebox and the connector for the ABS unit. See Brake pipe master cylinder / ABS unit, replacing Brake Pipe Master Cylinder / ABS Unit, Replacing
- the integrated relay / fusebox.
Tighten the screw. Tighten to 10 Nm
- the air cleaner (ACL) housing. See Brake pipe master cylinder / ABS unit, replacing Brake Pipe Master Cylinder / ABS Unit, Replacing.

Installing the battery lead
Install the battery cable. See Battery, disconnecting Battery Disconnecting.

Loading software

Note! Switch on the ignition.

Order applicable software.






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.

Function test

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!

See: Wheel sensor, front, replacing Wheel Sensor Front, Replacing.
Use VIDA vehicle communication to calibrate the control module.