Electronic Brake Control Module: Service and Repair
VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)REMOVAL
1) Disconnect the ground cable from the battery.
2) Use compressed air to remove moisture and dust around the VDCCM&H/U.
NOTE:
If the terminals become dirty, it may cause improper contact.
3) Lift the lock lever and Disconnect the VDCCM&H/U connector.
CAUTION:
Do not pull on the harness when disconnecting the connector.
4) Disconnect the brake pipes from the VDCCM&H/U.
5) Wrap the brake pipe with a vinyl bag so as not to spill the brake fluid on the vehicle body.
CAUTION:
If brake fluid is spilled on the vehicle body, wash it off immediately with water and wipe clean.
6) Remove the nuts and remove the VDCCM&H/U.
CAUTION:
^ Do not drop or bump the VDCCM&H/U.
^ Do not turn the VDCCM&H/U upside down or place it sideways during storage.
^ Be careful not to let foreign matter enter the VDCCM&H/U.
^ Be careful that no water enters the connectors.
7) Remove the VDCCM&H/U bracket.
INSTALLATION
1) Install the VDCCM&H/U bracket.
Tightening torque:
33 N.m (3.4 kgf-m, 24.3 ft-lb)
2) Install the VDCCM&H/U with a new nut (Part No. 023506000) by aligning the damper groove of the VDCCM&H/U to the bracket side claw.
3) Connect the brake pipes to their correct VDCCM&H/U positions.
4) Connect the VDCCM&H/U connector.
NOTE:
^ Be sure to remove all foreign matter from inside the connector before connecting.
^ Make sure the VDCCM&H/U connector is securely locked.
5) Bleed air from the brake system.
6) Check the parameter to confirm that the applied models and grades of the relevant vehicle are included.
7) If the applied model and grade of the target vehicle are not included on the {Parameter Check} display screen, perform parameter selection and registration.
NOTE:
^ When the VDCCM&H/U is replaced with a new part, be sure to perform the selection and registration operation.
^ For the selection and registration of parameter, the Subaru Select Monitor is required.
^ When no data is registered, ABS/EBD/VDC warning light illuminates and the DTC "Parameter selection failure" is detected.
ADJUSTMENT
When the following replacement, removal and installation are performed, be sure to perform the centering of the steering angle sensor and zero point setting of yaw rate & G sensor.
^ VDCCM&H/U
^ Steering angle sensor
^ Yaw rate & G sensor
^ Steering wheel parts (Including airbag)
^ Suspension parts
^ Wheel alignment adjustment
1) Park the vehicle straight on a level surface. (Engine operation)
2) Check that steering wheel is positioned at the center. (When the center position is not correct, adjust the wheel alignment.)
3) Set the Subaru Select Monitor to the vehicle, and select the {Set up mode for Neutral of Steering Angle Sensor & Lateral G Sensor 0 point} in the �Function Check Sequence� screen. (Follow the steps on the display.)
4) On �Brake Control System� display, select {Current Data Display & Save}, and check that the steering angle sensor shows "0 deg".
5) When the "0 deg" is not displayed, repeat the above steps and check that the "0 deg" is displayed.
6) Drive the vehicle for 10 minutes, and check that the ABS and VDC warning light is not illuminated.
7) Check that there is no unnecessary VDC operation or steering control loss. If there is a malfunction, repeat the steps above.