1996 SUBARU LEGACY relay

B4M0795B
8L9CHECK BROKEN WIRE IN MONITOR
SYSTEM CIRCUIT OF RELAY BOX.
1) Disconnect connector (F50) from relay box.
2) Measure resistance between relay box connector and
motor relay installing point.
: Connector & terminal
To (F50) No. 6—Motor relay installing point
No. 30
Is resistance less than 0.5Ω?
: Go to step8L10.
: Replace relay box.
B4M0894
8L10CHECK BROKEN WIRE IN CONTROL
CIRCUIT OF RELAY BOX.
1) Remove valve relay from relay box.
2) Measure resistance between motor relay installing point
and valve relay installing point.
: Connector & terminal
Motor relay installing point No. 86—Valve
relay installing point No. 30
Is resistance less than 0.5Ω?
: Go to next step.
: Replace relay box.
95
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0895B
3) Measure resistance between motor relay installing point
and relay box connector.
: Connector & terminal
Motor relay installing point No. 86—To
(F50) No. 4
Is resistance less than 0.5Ω?
: Go to step8L11.
: Replace relay box.
B4M0896
8L11CHECK GROUND SHORT IN CONTROL
CIRCUIT OF RELAY BOX.
Measure resistance between relay box and chassis
ground.
: Connector & terminal
Motor relay installing point No. 86—Chas-
sis ground
Motor relay installing point No. 85—Chas-
sis ground
Is resistance more than 1 MΩ?
: Go to step8L12.
: Replace relay box. Check fuse No. 19.
B4M0897
8L12CHECK BATTERY SHORT IN CONTROL
CIRCUIT OF RELAY BOX.
1) Turn ignition switch to ON.
2) Measure voltage between motor relay installing point
and chassis ground.
: Connector & terminal
Motor relay installing point (+) No. 86—
Chassis ground ()
Motor relay installing point (+) No. 85—
Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Replace relay box and check all fuses.
96
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

3) Turn ignition switch to OFF.
4) Measure voltage between motor relay installing point
and chassis ground.
: Connector & terminal
Motor relay installing point (+) No. 86—
Chassis ground
Motor relay installing point (+) No. 85—
Chassis ground
Is voltage 0 V?
: Go to step8L13.
: Replace relay box and check all fuses.
B4M0898B
8L13CHECK BROKEN WIRE IN MONITOR
SYSTEM HARNESS.
1) Connect between terminals No. 10 and No. 1 of
ABSCM connector (F49) with a lead wire.
2) Measure resistance between relay box connector and
chassis ground.
: Connector & terminal
(F50) No. 6—Chassis ground
Is resistance less than 0.5Ω?
: Go to step8L14.
: Repair harness connector between ABSCM and
relay box.
97
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0899A
8L14CHECK BROKEN WIRE IN RELAY CON-
TROL SYSTEM HARNESS.
1) Connect valve relay and motor relay to relay box.
2) Connect connector (F50) to relay box.
3) Connect connector to hydraulic unit.
4) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 22—Chassis ground
Is resistance 80±10Ω?
: Go to step8L15.
: Repair harness connector between ABSCM and
relay box.
B4M0900A
8L15CHECK GROUND SHORT BETWEEN
RELAY BOX AND ABSCM.
1) Disconnect connector (F50) from relay box.
2) Measure resistance between ABSCM connector and
chassis ground.
: Connector & terminal
(F49) No. 22—Chassis ground
(F49) No. 10—Chassis ground
Is resistance more than 1 MΩ?
: Go to step8L16.
: Repair harness between ABSCM and relay box.
Check fuse No. 19 and SBF6.
98
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

B4M0901A
8L16CHECK BATTERY SHORT BETWEEN
RELAY BOX AND ABSCM.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM and chassis ground.
: Connector & terminal
(F49) No. 22 (+)—Chassis ground ()
(F49) No. 10 (+)—Chassis ground ()
Is voltage 0 V?
: Go to next step.
: Repair harness between relay box and ABSCM.
Check fuse SBF6.
3) Turn ignition switch to OFF.
4) Measure voltage between ABSCM and chassis ground.
: Connector & terminal
(F49) No. 22 (+)—Chassis ground ()
(F49) No. 10 (+)—Chassis ground ()
Is voltage 0 V?
: Go to step8L17.
: Repair harness between relay box and ABSCM.
Check fuse SBF6.
B4M0902A
8L17CHECK GROUND SHORT AT ABSCM
MONITOR TERMINAL.
Measure resistance between ABSCM terminals.
: Connector & terminal
To (F49) No. 10—No. 1
Is resistance less than 0.5Ω?
: Go to step8L18.
: Replace ABSCM.
B4M0903A
8L18CHECK BATTERY SHORT AT ABSCM
MONITOR TERMINAL.
1) Disconnect connector cover from ABSCM connector.

2) Connect all connectors.
3) Turn ignition switch to ON.
4) Measure voltage between ABSCM connector terminals.
: Connector & terminal
(F49) No. 10 (+)—No.1()
Is voltage less than 2 V?
: Go to next step.
: Replace ABSCM.
5) Turn ignition switch to OFF.
6) Measure voltage between ABSCM connector terminals.
: Connector & terminal
(F49) No. 10 (+)—No.1()
Is voltage less than 2 V?
: Go to step8L19.
: Replace ABSCM.
99
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

8L22CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN HYDRAULIC UNIT,
RELAY BOX AND ABSCM.
: Is there poor contact in connector between
hydraulic unit, relay box and ABSCM?
: Repair connector.
: Go to step8L23.
8L23
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
101
4-4cBRAKES [ABS 5.3 TYPE]
8. Diagnostics Chart with Trouble Code

2. FA MODE (ON/OFF DATA ARE DISPLAYED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FA 0B1 Stop light switchLED 1 comes on with the switch on (with the brake
pedal down).
Possible 4-4c [T9I0] VR Valve relay signal LED 2 comes on with the valve relay off.
MR Motor relay signal LED 3 comes on with the motor on.
AT AT ABS signal LED 4 comes on when ABS control is on.
AW ABS warning light LED 6 comes on when the warning light is on.
VM Valve relay monitor LED 1 comes on with the valve relay off.
MM Motor relay monitor LED 8 comes on when the motor relay is on.
CM CCM signal LED 9 comes on when ABS control is on.
3. FB MODE (TROUBLE CODES ARE DISPLAYED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FB1D⋅ALL
History of trouble
codes is displayed.A maximum of 3 trouble codes are displayed in order
of occurrence.
Possible 4-4c [T10B0] D⋅NEWThe most recent trouble code appears on the select
monitor display.
D⋅MIDThe second most recent trouble code appears on the
select monitor display.
D⋅OLDThe third most recent trouble code appears on the
select monitor display.
B4M0919
NOTE:

If a particular trouble code is not properly stored in
memory (due to a drop in ABSCM power supply, etc.) when
a problem occurs, the trouble code, followed by a question
mark“?”, appears on the select monitor display. This shows
it may be an unreliable reading.

*a* refers to the troubles in order of occurrence (NEW.
MID and OLD).
11 2
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode

4. FC MODE (TROUBLE CODES AND FREEZE
FRAME DATA ARE ERASED.)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FC0 D⋅CLRHistory of trouble
codes and freeze
frame data is erased.Function of clearing trouble code and freeze frame
data stored in memory.Possible4-4c [T9J0]
5. FD MODE (ABS SEQUENCE CHECK MODE)
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FD1 A⋅CHKABS sequence con-
trolPerform ABS sequence control by operating valve and
pump motor sequentially.Impossible4-4
[W19D1]
6. FE MODE (FREEZE FRAME DATA)
NOTE:
Data stored at the time of trouble occurrence is shown on
display.
Function code
Measuring items Contents to be monitored Scroll Ref. to
Code Abbreviation
FE1 FR FR wheel speed (mile/h)Wheel speed detected by the FR ABS sensor is displayed in
mile/h.Possible 4-4c [T9K0]
FE2 FL FL wheel speed (mile/h)Wheel speed detected by the FL ABS sensor is displayed in
mile/h.Possible 4-4c [T9L0]
FE3 RR RR wheel speed (mile/h)Wheel speed detected by the RR ABS sensor is displayed in
mile/h.Possible 4-4c [T9M0]
FE4 RL RL wheel speed (mile/h)Wheel speed detected by the RL ABS sensor is displayed in
mile/h.Possible 4-4c [T9N0]
FE5 FR FR wheel speed (km/h)Wheel speed detected by the FR ABS sensor is displayed in
km/h.Possible 4-4c [T9K0]
FE6 FL FL wheel speed (km/h)Wheel speed detected by the FL ABS sensor is displayed in
km/h.Possible 4-4c [T9L0]
FE7 RR RR wheel speed (km/h)Wheel speed detected by the RR ABS sensor is displayed in
km/h.Possible 4-4c [T9M0]
FE8 RL RL wheel speed (km/h)Wheel speed detected by the RL ABS sensor is displayed in
km/h.Possible 4-4c [T9N0]
FE13 POWERABSCM power supply
voltage (V)Power (in volts) supplied to ABSCM appears on the select
monitor display.Possible 4-4c [T9O0]
FE14 G-SENSG sensor output voltage
(V)Refers to vehicle acceleration detected by the analog G sen-
sor. It appears on the select monitor display in volts.Possible 4-4c [T9P0]
FE15MM Motor relay monitor LED 1 comes on when motor relay is on.
Possible 4-4c [T9Q0] B1 Stop light switchLED 2 comes on with the stop light switch on (with the brake
pedal depressed).
AT AT ABS signal LED 3 comes on when ABS control is on.
CM CCM signal LED 4 comes on when ABS control is on.
A0 ABS control LED 5 comes on when ABS control is on.
11 3
4-4cBRAKES [ABS 5.3 TYPE]
9. Select Monitor Function Mode