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4-7 IT11G0]
AUTOMATIC AIR CONDITIONING SYSTEM
G : TROUBLE CODE (31) - Check air mix door circuit.
CONTENT OF DIAGNOSIS :
31 : Shorted P .B .R . circuit
(P .B .R. : Potentio Balance Resistor)
OK
1
Check P .B.R . circuit.
Not OK
Not OK
2
Check output signals for auto amplifier.
OK
3
Check harness connector between auto amplifier
Not OK
and air mix door .
OK
Replace air mix door motor .
TROUBLE SYMPTOM :
Outlet air temperature does not change. (Compart-
ment temperature cannot be controlled to "set" value .
Check trouble cord 33 .
Repair auto amplifier terminal poor contact . (Replace
auto amplifier .)
Replace and recheck .
Repair harness .
Air mix door
actuator
P. B . R .
M
V
a
:
i17
B79
I11
b
:
i16
NU4
HU1
882
z
y
b1
e
Detect
oaltion
b4
Ground
6
5
2
Auto
amp .
Max . cc
d
Max . hot
B78
i]0
HU4
B82
i11
ilb
i17
I]0
1 2M31
1 2
34
1 234_
5678
1 2345678910
M :2-
1 234n,-, 6789
4S67
5678910
9101112131415161718
11121314151617181920
910111213141516
H111121314151617111920
C4-726
Fig . 245
120
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Troubleshooting
