FAIL SAFE FUNCTION
00
Normal
-
11
Open INCAR Sensor circuit
• Incar sensor
• Harness or connector between incar sensor and A/C
control assembly
• A/C control assembly
12
Shorted INCAR Sensor circuit
13
Open Ambient sensor circuit
• Ambient sensor
• Harness or connector between ambient sensor and A/C
control assembly
• A/C control assembly
14
Shorted Ambient sensor circuit
15
Open water temp. sensor
• Water temp. sensor
• Harness or connector between water temp. sensor and
A/C control assembly
• A/C control assembly
16
Shorted water temp. sensor
17
Open thermistor
• Pin thermistor
• Harness or connector between evap. sensor and A/C
control assembly
• A/C control assembly
18
Shorted thermistor
19
Open or shorted temp. door potentiometer
• Harness or connector between temp. door potentiometer
and A/C control assembly
20
Defective temp. door potentiometer
• Temp. door potentiometer
21
Open or shorted mode door potentiometer
• Harness or connector between mode door potentiometer
and A/C control assembly
22
Defective mode door potentiometer
• Mode door potentiometer
No.
Item
Failure
FAIL SAFE Function
1
IN-CAR temperature sensor
Open/Short
25°C alternate value control
2
Ambient temperature sensor
Open/Short
20°C alternate valu e control
3
Thermistor sensor
Open/Short
-2°C alternate value contr ol
4
Water temperature sensor
Open/Short
-20°C alternate valu e control
5
Temperature door potentiometer
Open/Short setup
temperature
For 17°C to 24.5°C, set to maximum cooling
position.
For 25°C to 32°C, set to maximum heating
position.
6
Mode door potentimeter
Open/Short setup
mode
Vent mode, at vent mode
Def mode, at except vent mode
Page 3 of 3
24.04.2008
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