Ford TRADER Workshop Manual page 833

TROUBLESHOOTING
u
Symptom Blower motor does not operate if fan switch is "3" position
1. Turn engine switch ON
2. Set fan switch "3" position
M
Resister assembly malfunction
3. Check that there is OV at LN wire voltage of resister
-Check resister assembly (Refer to page U-12)
assembly connector
~
NG
1. Check that there is OV at LN wire voltage of fan
OK
Open circuit in wiring harness
switch connector
(Resister assembly-fan switch;
L!Y
wire)
!
NG
Fan switch malfunction
• Check fan switch (Refer to page U-1S)
9TGOUX'()()8
Symptom
Blower motor does not operate if fan switch is "4"
position
1. Turn engine switch ON
2. Set fan switch "4" position
M
Blower motor malfunction
3. Check that there is OV at L wire voltage of blower
.Check blower motor (Refer to page U-12)
motor connector
!
NG
1. Check that there is OV at L wire voltage of fan switch
OK
Open circuit in wiring harness
connector (Resister assembly-fan switch; L wire)
!
NG
Fan switch malfunction
• Check fan switch (Refer to page U-1S)
9TGOUX.0Q9
I
Symptom
I
Blower motor does not operate
NG
1. Check that heater fuse is normal Short circuit in wiring harness
!
OK
• Check wiring harness
1. Turn engine switch ON
~
Open circuit in wiring harness
2. Check that there is 12V at RN wire of blower motor (Heater fuse-blower motor; RN wire)
connector • Repair wiring harness
!
OK
1. Turn fan switch "3" position
NG
Blower motor malfunction
2. Check that there is 12V
at
L wire of blower motor
- - i
• Check blower motor (Refer to page "U-12)
connector
lOK
1. Check that there is 12V at L wire of resister assembly
~
Open circuit in wiring harness
connector
(Blower motor-resister assembly; L wire)
!
OK
• Repair wiring harness
I
A
I
U-5