Subaru IMPREZA 2002 Service Manual page 318

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
U: DTC42
POWER SUPPLY VOLTAGE TOO LOW
DIAGNOSIS:
Power source voltage of the ABSCM&H/U is low.
TROUBLE SYMPTOM:
ABS does not operate.
WIRING DIAGRAM:
BATTERY
R E LAY
HOLDER
ABS
RELAY
BR0085
ABS-I 32