Subaru Legacy IV (2008 year). Service manual — part 907

ABS(diag)-27

ABS Warning Light / Brake Warning Light Illumination Pattern

ABS (DIAGNOSTICS)

D: BRAKE WARNING LIGHT DOES NOT GO OFF

DETECTING CONDITION:
• Brake warning light circuit is shorted.
• Defective sensor/connector
TROUBLE SYMPTOM:
After starting the engine, the brake warning light remains lit though the parking lever is released.
WIRING DIAGRAM:

B301

B16

1
2

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

i10

2

1

3 4

6 7 8 9 10

22

21

20

19

18

17

16

15

14

13

12

11

5

A:

B:

E

MAIN SBF

SBF-6

E

No.5

8

B301

B36

B16

i1

B38

i3

B404

i10

A:

i11

B:

ABSCM & H/U

A3

A7

20

16

15

1
2

1

*

2

*

2

*

B38

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

i1

5 6 7 8

2

1

9

4

3

10

24

22

23

25

27

26

28

11 12 13

14 15 16

17 18 19 20 21

ABS01070

1

*

1 2 3

4 5 6

7 8 9 10 11 12 13 14

i11

BATTERY

IGNITION
SWITCH

COMBINATION
METER

PARKING BRAKE
FLUID LEVEL
WARNING LIGHT

BRAKE FLUID
LEVEL SWITCH

PARKING

SWITCH

REVERSE

CIRCUIT

: NORMAL METER
METER WITH MID

: A8
: A4

: NORMAL METER
METER WITH MID

: B10
: A8

ABS(diag)-28

ABS Warning Light / Brake Warning Light Illumination Pattern

ABS (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK INSTALLATION OF ABSCM&H/U
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Check that the ABSCM&H/U connector is
inserted to ABSCM&H/U until the clamp locks
onto it.

Is the connector firmly
inserted?

Go to step 2.

Insert the
ABSCM&H/U con-
nector until the
clamp locks com-
pletely.

2

READ DTC.
Read the DTC. <Ref. to ABS(diag)-18, Read
Diagnostic Trouble Code (DTC).>

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK BRAKE FLUID AMOUNT.
Check the amount of brake fluid in the reservoir
tank of the master cylinder.

Is the amount of brake fluid
between the lines of “MAX” and
“MIN”?

Go to step 4.

Replenish brake
fluid to the speci-
fied value.

4

CHECK BRAKE FLUID LEVEL SWITCH.
1) Disconnect the level switch connector (B16)
from master cylinder.
2) Measure the resistance of master cylinder
terminals.

Terminals

No. 1 — No. 2:

Is the resistance 1 M

: or

more?

Go to step 5.

Replace the mas-
ter cylinder.

5

CHECK PARKING BRAKE SWITCH.
1) Disconnect the connector (B404) from park-
ing brake switch.
2) Release the parking brake.
3) Measure the resistance between parking
brake switch terminal and chassis ground.

Is the resistance 1 M

: or

more?

Go to step 6.

Replace the park-
ing brake switch.

6

CHECK GROUND SHORT OF HARNESS.
1) Disconnect the connectors (i10 and i11)
from the combination meter.
2) Measure the resistance between combina-
tion meter connector and chassis ground.

Connector & terminal

Model with the normal meter

(i10) No. 8 — Chassis ground:
(i11) No. 10 — Chassis ground:

Model with the meter with MID

(i10) No. 8 — Chassis ground:
(i10) No. 4 — Chassis ground:

Is the resistance 1 M

: or

more?

Go to step 7.

Repair the harness
connector between
combination meter
and parking brake
switch.

7

CHECK HARNESS.
1) Disconnect the connector (B301) from the
ABSCM&H/U.
2) Disconnect the connector (i10) from the
combination meter.
3) Measure the resistance between the
ABSCM&H/U connector and combination
meter connector.

Connector & terminal

(B301) No. 8 — (i10) No. 7:

Is the resistance less than 0.5

:? Go to step 8.

Repair the harness
between the
ABSCM&H/U and
the combination
meter.

8

CHECK POOR CONTACT IN CONNECTOR.
Check for poor contact in all connectors.

Is there poor contact?

Repair the connec-
tor.

Go to step 9.

9

CHECK ABSCM.
1) Connect the connector to the ABSCM&H/U.
2) Turn the ignition switch to ON.
3) Measure the resistance between combina-
tion meter connector and chassis ground.

Connector & terminal

(i10) No. 7 — Chassis ground:

Is the resistance less than 0.5

:? Check the combi-

nation meter.

Replace the
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

ABS(diag)-29

List of Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

11.List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Content of diagnosis

Display

Reference target

C0101

ABS wheel speed sen-
sor malfunction (Bro-
ken wire, short)

Rear ABS wheel
speed sensor RH

Rear Right ABS Sen-
sor Circuit Open or
Shorted Battery

<Ref. to ABS(diag)-31, DTC C0101 ABS WHEEL
SPEED SENSOR MALFUNCTION RR SENSOR
(BROKEN WIRE, INPUT VOLTAGE TOO HIGH),
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0102

Rear ABS wheel
speed sensor LH

Rear Left ABS Sensor
Circuit Open or
Shorted Battery

<Ref. to ABS(diag)-31, DTC C0102 ABS WHEEL
SPEED SENSOR MALFUNCTION RL SENSOR
(BROKEN WIRE, INPUT VOLTAGE TOO HIGH),
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0103

Front ABS wheel
speed sensor RH

Front Right ABS Sen-
sor Circuit Open or
Shorted Battery

<Ref. to ABS(diag)-31, DTC C0103 ABS WHEEL
SPEED SENSOR MALFUNCTION FR SENSOR
(BROKEN WIRE, INPUT VOLTAGE TOO HIGH),
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0104

Front ABS wheel
speed sensor LH

Front Left ABS Sensor
Circuit Open or
Shorted Battery

<Ref. to ABS(diag)-32, DTC C0104 ABS WHEEL
SPEED SENSOR MALFUNCTION FL SENSOR
(BROKEN WIRE, INPUT VOLTAGE TOO HIGH),
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>

C0105

ABS wheel speed sen-
sor malfunction (ABS
wheel speed sensor
abnormal signal)

Abnormal signal
of rear ABS
wheel speed sen-
sor RH

Rear Right ABS Sen-
sor Signal

<Ref. to ABS(diag)-34, DTC C0105 REAR ABS
WHEEL SPEED SENSOR RH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL
SIGNAL), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

C0106

Abnormal signal
of rear ABS
wheel speed sen-
sor LH

Rear Left ABS Sensor
Signal

<Ref. to ABS(diag)-34, DTC C0106 REAR ABS
WHEEL SPEED SENSOR LH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL
SIGNAL), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

C0107

Abnormal signal
of front ABS
wheel speed sen-
sor RH

Front Right ABS Sen-
sor Signal

<Ref. to ABS(diag)-34, DTC C0107 FRONT ABS
WHEEL SPEED SENSOR RH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL
SIGNAL), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

C0108

Abnormal signal
of front ABS
wheel speed sen-
sor LH

Front Left ABS Sensor
Signal

<Ref. to ABS(diag)-35, DTC C0108 FRONT ABS
WHEEL SPEED SENSOR LH MALFUNCTION
(ABS WHEEL SPEED SENSOR ABNORMAL
SIGNAL), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

C0109

Power voltage malfunction

Power Supply Voltage
Failure

<Ref. to ABS(diag)-47, DTC C0109 POWER
VOLTAGE MALFUNCTION, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

C0110

ABS control module malfunction

Electrical Control Mod-
ule

<Ref. to ABS(diag)-45, DTC C0110 ABS CON-
TROL MODULE MALFUNCTION, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

C0111

Motor/motor relay on failure

Motor and Motor Relay

<Ref. to ABS(diag)-52, DTC C0111 MOTOR/
MOTOR RELAY MALFUNCTION, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

C0114

Defective valve relay

Valve Relay

<Ref. to ABS(diag)-50, DTC C0114 VALVE
RELAY MALFUNCTION, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

ABS(diag)-30

List of Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

C0115

ABS wheel speed sen-
sor malfunction (ABS
wheel speed sensor
abnormal signal)

Abnormal ABS
wheel speed sen-
sor on any one of
four sensors

Any One of Four ABS
Sensors Signal

<Ref. to ABS(diag)-38, DTC C0115 ABS WHEEL
SPEED SENSOR SIGNAL MALFUNCTION IN
ONE OF FOUR WHEELS, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

C0116

Stop light switch circuit malfunction

Brake Light Switch

<Ref. to ABS(diag)-54, DTC C0116 FAULTY
STOP LIGHT SWITCH, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

C0118

Faulty G sensor output voltage

G Sensor Failure

<Ref. to ABS(diag)-56, DTC C0118 G SENSOR
OUTPUT VOLTAGE MALFUNCTION, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

C0119

Abnormal G sensor output signal

G Sensor Signal

<Ref. to ABS(diag)-59, DTC C0119 G SENSOR
OUTPUT SIGNAL MALFUNCTION, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

C0120

Inlet valve malfunction
in hydraulic unit

Front inlet valve
LH

FL Hold Valve mal-
function

<Ref. to ABS(diag)-40, DTC C0120 FRONT
INLET SOLENOID VALVE LH MALFUNCTION IN
ABS CONTROL MODULE AND HYDRAULIC
CONTROL UNIT (ABSCM&H/U), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0121

Outlet valve malfunc-
tion in hydraulic unit

Front outlet valve
LH

FL Pressure Reducing
Valve malfunction

<Ref. to ABS(diag)-42, DTC C0121 FRONT
OUTLET SOLENOID VALVE LH MALFUNCTION
IN ABS CONTROL MODULE AND HYDRAULIC
CONTROL UNIT (ABSCM&H/U), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0122

Inlet valve malfunction
in hydraulic unit

Front inlet valve
RH

FR Hold Valve mal-
function

<Ref. to ABS(diag)-40, DTC C0122 FRONT
INLET SOLENOID VALVE RH MALFUNCTION
IN ABS CONTROL MODULE AND HYDRAULIC
CONTROL UNIT (ABSCM&H/U), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0123

Outlet valve malfunc-
tion in hydraulic unit

Front outlet valve
RH

FR Pressure Reducing
Valve malfunction

<Ref. to ABS(diag)-42, DTC C0123 FRONT
OUTLET SOLENOID VALVE RH MALFUNCTION
IN ABS CONTROL MODULE AND HYDRAULIC
CONTROL UNIT (ABSCM&H/U), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0124

Inlet valve malfunction
in hydraulic unit

Rear inlet valve
LH

RL Hold Valve mal-
function

<Ref. to ABS(diag)-40, DTC C0124 REAR INLET
SOLENOID VALVE LH MALFUNCTION IN ABS
CONTROL MODULE AND HYDRAULIC CON-
TROL UNIT (ABSCM&H/U), Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

C0125

Outlet valve malfunc-
tion in hydraulic unit

Rear outlet valve
LH

RL Pressure Reduc-
ing Valve malfunction

<Ref. to ABS(diag)-42, DTC C0125 REAR OUT-
LET SOLENOID VALVE LH MALFUNCTION IN
ABS CONTROL MODULE AND HYDRAULIC
CONTROL UNIT (ABSCM&H/U), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0126

Inlet valve malfunction
in hydraulic unit

Rear inlet valve
RH

RR Hold Valve mal-
function

<Ref. to ABS(diag)-41, DTC C0126 REAR INLET
SOLENOID VALVE RH MALFUNCTION IN ABS
CONTROL MODULE AND HYDRAULIC CON-
TROL UNIT (ABSCM&H/U), Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>

C0127

Outlet valve malfunc-
tion in hydraulic unit

Rear outlet valve
RH

RR Pressure Reduc-
ing Valve malfunction

<Ref. to ABS(diag)-43, DTC C0127 REAR OUT-
LET SOLENOID VALVE RH MALFUNCTION IN
ABS CONTROL MODULE AND HYDRAULIC
CONTROL UNIT (ABSCM&H/U), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C0140

Defective CAN communication

Improper CAN com-
munication

<Ref. to ABS(diag)-49, DTC C0140 CAN COM-
MUNICATION MALFUNCTION, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

DTC

Content of diagnosis

Display

Reference target