Subaru 2009 IMPREZA Service Manual page 2403

ABS Warning Light / Brake Warning Light Illumination Pattern
NOTE:
Even though the ABS warning light does not go off after approximately 1.5 seconds from ABS warning light
illumination, the ABS function operates normally when the warning light goes off while driving at approxi-
mately 12 km/h (7 MPH). However, the ABS system does not work while the ABS warning light is illuminated.
B: ABS WARNING LIGHT DOES NOT COME ON
DETECTING CONDITION:
• Defective combination meter
• Defective CAN communication
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), ABS warning light does not illuminate.
Step
1 CHECK ILLUMINATION OF OTHER LIGHTS.
Turn the ignition switch to ON. (engine OFF)
2 READ DTC.
Read the DTC. <Ref. to ABS(diag)-19, Read
Diagnostic Trouble Code (DTC).>
3 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-31, OPERATION, Read Diagnostic
Trouble Code (DTC).>
4 CHECK COMBINATION METER.
Check the combination meter. <Ref. to IDI-4,
INSPECTION, Combination Meter System.>
C: ABS WARNING LIGHT DOES NOT GO OFF
DETECTING CONDITION:
• Defective combination meter
• Defective CAN communication
TROUBLE SYMPTOM:
When starting the engine, the ABS warning light is kept on.
Step
1 READ DTC.
Read the DTC. <Ref. to ABS(diag)-19, Read
Diagnostic Trouble Code (DTC).>
2 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-31, OPERATION, Read Diagnostic
Trouble Code (DTC).>
3 CHECK COMBINATION METER.
Check the combination meter. <Ref. to IDI-4,
INSPECTION, Combination Meter System.>
Check
Do other warning lights illumi-
nate?
Is DTC displayed?
Is there any fault in LAN sys-
tem?
Is combination meter OK?
Check
Is DTC displayed?
Is there any fault in LAN sys-
tem?
Is combination meter OK?
ABS(diag)-23
ABS (DIAGNOSTICS)
Yes No
Go to step 2. Check the combi-
nation meter.
Perform the diag- Go to step 3.
nosis according to
DTC.
Perform the diag- Go to step 4.
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).>
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC.
Perform the diag- Go to step 3.
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).>