ECM Terminal Arrangement

Skid control computer (brake actuator ASSY) terminal arrangement

Courtesy of SUBARU OF AMERICA, INC.

NOTE:

The skid control computer is integrated into the brake actuator ASSY and uses water-proof connectors. Therefore, voltage check and oscilloscope waveform checks for each terminal cannot be performed with the computer installed in the vehicle.
For the operation check and communication check of the skid control computer (brake actuator ASSY), use the data monitor and active test in the SSM4. (Refer to DATA MONITOR )

TERMINAL DESCRIPTION - SKID CONTROL COMPUTER (BRAKE ACTUATOR ASSY) TERMINAL ARRANGEMENT

Terminal No.	terminal symbol	Terminal name
1	+BM	Motor relay drive power supply
2	SPD	Vehicle speed signal output
4	FR-	Speed sensor FR RH signal input
8	FL-	Speed sensor FR LH signal input
9	CSW2	TRACK switch input
12	CSW1	Vehicle stability control OFF switch input
13	GND2	Actuator pump motor GND
14	CANL	CAN communication input/output
16	FR+	Speed sensor FR RH power supply output
17	RR+	Speed sensor RR RH power supply output
18	RL-	Speed sensor RR LH signal input
19	FL+	Speed sensor FR LH power supply output
25	+BS	Solenoid relay drive power supply
26	CANH	CAN communication input/output
28	IG1	IG power supply (ECM power supply) input
29	RR-	Speed sensor RR RH signal input
30	STP	Stop light switch input
31	RL+	Speed sensor RR LH power supply output
38	GND1	Skid control computer GND

Skid control computer (brake actuator ASSY), wiring harness side connector check

Courtesy of SUBARU OF AMERICA, INC.

Disconnect the connector from the skid control computer (brake actuator ASSY).

Check the voltage and resistance between chassis ground and each terminal of the connector on the wiring harness side of the skid control computer (brake actuator ASSY).

Criteria

TERMINAL DESCRIPTION

Terminal No. (terminal symbol)	Terminal description	Measuring condition	Standard value
A5-1 (+BM)←→chassis ground	Motor relay drive power supply	Always	11 to 14V
A5-12 (CSW1)←→chassis ground	Vehicle stability control OFF switch input	Press and hold Vehicle stability control OFF switch.	Less than 1 Ω
A5-12 (CSW1)←→chassis ground	Vehicle stability control OFF switch input	Release Vehicle stability control OFF.	10 k Ωor more
A5-13 (GND2)←→chassis ground	Actuator pump motor GND	Always	Less than 1 Ω
A5-25 (+BS)←→chassis ground	Solenoid relay drive power supply	Always	11 to 14V
A5-9 (CSW2)←→chassis ground	TRACK switch input	Press and hold TRACK switch.	Less than 1 Ω
A5-9 (CSW2)←→chassis ground	TRACK switch input	Release TRACK switch.	10 kΩ or more
A5-28 (IG1)←→chassis ground	IG power supply (ECM power supply) input	IG ON	11 to 14V
A5-30 (STP)←→chassis ground	Stop light switch input	Brake pedal, depressed	8 to 14V
A5-30 (STP)←→chassis ground	Stop light switch input	Brake pedal, released	Less than 1.5 V
A5-38 (GND1)←→chassis ground	Skid control computer GND	Always	Less than 1 Ω