Is battery
voltage measured at LW
line of drain hose heater
connector?
Drain hose heater is defective.
NO
YES
Is battery
voltage measured at BrR
line of drain hose heater
connector?
LW line between fuse (F1) and
drain hose heater is broken of
contact of connector is
defective.
BR line between controller and
relay box AR7 is broken or
contact of connector is
defective.
• AR7 relay is defective.
• BrR and G lines between
drain hose heater and relay
box (AR7) are broken or
contact of connector is
defective.
NO
Refer to page 55, defrost
operation.
Is defrost operation
normally made?
NO
YES
YES
Is battery
voltage measured at BR
line of AR7 coil?
NO
WR line of AR7 coil is broken
or defective.
Is
WR line of AR7 coil
under 0.5V?
NO
(Battery voltage)
YES
YES
Drain hose will freeze.
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