Honda Acura NSX 1991 Service Manual page 900

Troubleshouting
The Automatic Climate Control System has a built-in self-diagnosis feature. To run it, turn the ignition switch ON and
turn the FAN switch to AUTO position. Wait for at least one minute on each TEMP display 18°C (64OF), 32OC (90°F).
Then, push both the AUTO and OFF buttons on the control unit at the same time. Any problems in circuits "A" through
The climate control unit does not memorize which self-diagnosis indicator lights comes on. If you turn the ignition switch
OFF, the indicator light memory will be lost.
INDICATOR
IN-CAR TEMPERATURE SENSOR
A M O D E
B
SUNLIGHT SENSOR
C
D COOLANT TEMPERATURE SENSOR
EVAPORATOR TEMPERATURE
E
SENSOR
F AIR MIX CONTROL MOTOR
MODE CONTROL MOTOR
G O N (A/C)
RECIRCULATION CONTROL MOTOR
H OFF (A/C)
LED on
I VENT DOOR CONTROL MOTOR
defroster
button
22-l 2
I
COMPONENT WITH PROBLEM
A
B C
F
I I
D E H
POSSIBLE CAUSE
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Air mix door stuck
Open position signal circuit
Mode door stuck
Open position signal circuit
Open or short circuit
Vent door stuck
e
Refer to PAGE
22-l 6
22-l 8
22-20
22-22
22-24
22-26
22-30
22-32
22-34