DTC C1811 System: Trouble symptom

ABS does not operate.
VDC does not operate.
EBD may not operate.
Hill start assist does not operate.
Hill descent control does not operate. (Model with X mode)
EyeSight does not operate. (Model with EyeSight)

CHECK INSTALLATION OF VDCCM&H/U.
Is VDCCM&H/U installed properly without being tilted?

Is the bracket deformationfree?

Are the VDCCM&H/U installation bolts installed without missing or getting loose?
- Yes : Go to 2.
- No : Repair the defective part.
  - Install VDCCM&H/U properly.
  - Replace the bracket if faulty.
  - Tighten the VDCCM&H/U installation bolt. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>General Description>COMPONENT>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) .
    Go to 2.
CHECK STEERING WHEEL.
1. Drive the vehicle on a flat road.
2. Park the vehicle straight.
3. Check the steering wheel for deviation from center.
  Is the deviation from the center of steering wheel less than 5°?
  - Yes : Go to 3.
  - No : Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT>VDC SENSOR MIDPOINT SETTING MODE .
    Go to 3.
CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR.
1. Adjust steering wheel to the center position.
2. Using the Subaru Select Monitor, select Data monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Subaru Select Monitor>OPERATION>DATA MONITOR .
3. Read [Steering Angle Sensor] indicated on the display screen.
Is the value of [Steering Angle Sensor] -10° - 10°?
- Yes : Go to 4.
- No : Check the installation of the steering wheel and steering angle sensor, and correct the installation if it is improper. If the installation condition is correct, replace the sensor.
CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR.
1. Drive the vehicle on a flat road.
2. Park the vehicle straight.
3. Using the Subaru Select Monitor, select Data monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Subaru Select Monitor>OPERATION>DATA MONITOR .
4. Read [Lateral G Sensor], [Longitudinal G Sensor] and [Yaw Rate Sensor] indicated on the display screen.
Is the reading of each sensor following value?

[Lateral G Sensor]: -2 - 2 m/s²

[Longitudinal G Sensor]: -2 - 2 m/s²

[Yaw Rate Sensor]: -4 - 4 deg/s
- Yes : Go to 5.
- No : Recheck from step 1, and if the problem is not solved, go to next. Go to 8.
SET 0 POINT FOR LONGITUDINAL G SENSOR USING SUBARU SELECT MONITOR.
1. Using the Subaru Select Monitor, select Work Support.
2. Perform the VDC sensor midpoint setting mode. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT>VDC SENSOR MIDPOINT SETTING MODE .
Is the 0 point setting successful?
- Yes : Go to 6.
- No : Recheck from step 1, and when the 0 point setting is not possible, replace the VDCCM and the steering angle sensor. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT . Ref. to VEHICLE DYNAMICS CONTROL (VDC)>Steering Angle Sensor .
PERFORM DRIVING TEST.
Drive approximately 10 minutes, and check if the warning lights illuminate or improperly operate during driving.

Did the ABS warning light or VDC warning light remain off?

Does ABS or VDC operate without malfunction?
- Yes : Go to 7.
- No : Recheck from step 1, and when the warning lights illuminate or improperly operate, replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .
CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR.
1. Park the vehicle on a level surface.
2. Using the Subaru Select Monitor, select Data monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Subaru Select Monitor>OPERATION>DATA MONITOR .
3. Read [Lateral G Sensor], [Longitudinal G Sensor] and [Yaw Rate Sensor] indicated on the display screen.
Is the reading of each sensor following value?

[Lateral G Sensor]: -2 - 2 m/s²

[Longitudinal G Sensor]: -2 - 2 m/s²

[Yaw Rate Sensor]: -4 - 4 deg/s
- Yes : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.
- No : Replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .
CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR.
1. Remove the VDCCM&H/U installation bolt and bracket.
2. Keep VDCCM&H/U in a horizontal position.
3. Using the Subaru Select Monitor, select Data monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Subaru Select Monitor>OPERATION>DATA MONITOR .
4. Read [Lateral G Sensor], [Longitudinal G Sensor] and [Yaw Rate Sensor] indicated on the display screen.
When VDCCM&H/U is in a horizontal position, is the reading of each sensor following value?

[Lateral G Sensor]: -1.5 - 1.5 m/s²

[Longitudinal G Sensor]: -1.5 - 1.5 m/s²

[Yaw Rate Sensor]: -4 - 4 deg/s
- Yes : Check the bracket and brake pipe, and install VDCCM&H/U in a horizontal position to the vehicle.
- No : Replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .