Subaru 2009 IMPREZA Service Manual page 2405

ABS Warning Light / Brake Warning Light Illumination Pattern
Step
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.
2 READ DTC.
Read the DTC. <Ref. to ABS(diag)-19, Read
Diagnostic Trouble Code (DTC).>
3 CHECK BRAKE FLUID AMOUNT.
Check the amount of brake fluid in the reservoir
tank of the master cylinder.
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:
5 CHECK GROUND SHORT OF HARNESS.
1) Disconnect the connector (i10) from combi-
nation meter.
2) Measure the resistance between combina-
tion meter connector and chassis ground.
Connector & terminal
(i10) No. 8 — Chassis ground:
6 CHECK PARKING BRAKE SWITCH.
1) Disconnect the connector (R4) from parking
brake switch.
2) Release the parking brake.
3) Measure the resistance between parking
brake switch terminal and chassis ground.
7 CHECK GROUND SHORT OF HARNESS.
1) Disconnect the connector (B281) from body
integrated unit.
2) Measure the resistance between body inte-
grated unit connector and chassis ground.
Connector & terminal
(B281) No. 15 — Chassis ground:
8 CHECK POOR CONTACT OF CONNECTOR.
Check for poor contact of all connectors.
9 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-31, OPERATION, Read Diagnostic
Trouble Code (DTC).>
10 CHECK COMBINATION METER.
Check the combination meter. <Ref. to IDI-4,
INSPECTION, Combination Meter System.>
Check
Is the connector firmly
inserted?
Is DTC displayed?
Is the amount of brake fluid
between the lines of "MAX" and
"MIN"?
Is the resistance 1 M or
more?
Is the resistance 1 M or
more?
Is the resistance 1 M or
more?
Is the resistance 1 M or
more?
Is there poor contact?
Is there any fault in LAN sys-
tem?
Is combination meter OK?
ABS(diag)-25
ABS (DIAGNOSTICS)
Yes No
Go to step 2. Insert the
ABSCM&H/U con-
nector until the
clamp locks com-
pletely.
Perform the diag- Go to step 3.
nosis according to
DTC.
Go to step 4. Replenish brake
fluid to the speci-
fied value.
Go to step 5. Replace the mas-
ter cylinder.
Go to step 6. Repair the harness
between combina-
tion meter and
brake fluid level
switch.
Go to step 7. Replace the park-
ing brake switch.
Go to step 8. Repair the harness
between body inte-
grated unit and
parking brake
switch.
Repair the connec- Go to step 9.
tor.
Perform the diag- Go to step 10.
nosis according to
DTC for LAN sys-
tem.
Replace the Replace the com-
ABSCM only. <Ref. bination meter.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>