Mazda 323 1988 Workshop Manual page 1002

REAR WINDOW DEFROSTER 15
TROUBLESHOOTING
Defroster does not operate.
1
Short circuit (Broken wire)
'0
Turn Ign switch to ON.
Confirm 12V on SW wire of defroster switch.
Broken wire (Fuse - Defroster switch)
Confirm 12V on BY wire of defroster switch with
NO
the switch ON.
Defective defroster switch.
0
With the switch ON, confirm 12V on BR wire of
the defroster heater (right side)
NG
Broken wire (Defroster switch - heater)
Confirm OV on B wire of
(left side)
Faulty grounding of heater
I
OK
Check heater (See P15-108)
Indicator light on meter unit does not
operate.
0
1
Turn Ign switch and defroster switch to ON.
ZZonqyfirm 12V on BY wire of connector to meter
NG
Broken wire (Defroster - Meter unit)
I
/
OK
Burnt out bulb, or Defective meter unit.
1
83U5X-10
15-l 07