Inspection steps

CAUTION:

When the skid control computer (brake actuator assembly) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to WORK SUPPORT )
Before performing troubleshooting, check the fuse for this circuit.

Check wiring harness and connector (motor relay power supply)

Check the connector of the skid control computer (brake actuator assembly) for a trouble such as poor engagement or disconnection.
Criteria: No trouble
Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator assembly).
Check the case and terminal of the connector for deformation and/or corrosion.
Criteria: No deformation or corrosion.

Check the voltage and resistance between terminals.

Voltage

Inspection terminals	Inspection conditions	Standard value
A5-1(+BM) - chassis ground	Always	11 to 14V

Resistance

Inspection terminals	Inspection conditions	Standard value
A5-38(GND1) - chassis ground	Always	Less than 1 Ω
A5-13(GND2) - chassis ground	Always	Less than 1 Ω

Fig 1: Skid Control Computer (Brake Actuator Assembly) Connector End View (A5)

Courtesy of SUBARU OF AMERICA, INC.

NG: Repair or replacement of wiring harness or connector

OK: Go to next step

Diagnostic code list recheck

Using SSM3, clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
Turn IG OFF→ON, and drive for 30 seconds or more at the speed of 40km/h or more.

If the ABS warning light illuminates, check the diagnostic code, using SSM3. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )

Result

Result	Go to
No output	A
Output exists	B

NOTE:

The skid control computer (brake actuator assembly) self-diagnoses the motor relay circuit when IG is turned ON and the vehicle speed, 40 km/h has been input with the stop light switch turned OFF.
If the normal diagnostic code is output, lightly shake the connector, wiring harness, and fuse related to the skid control computer (brake actuator assembly) to make sure that no error code is output.
If an error code has been output by shaking them, check or repair the relevant connector or wiring harness.

B: Replacement of skid control computer (brake actuator assembly) (Refer to REMOVAL )