Troubleshooting
Self-diagnosis Circuit Check
The Automatic Climate Control System has a built-in self diagnosis feature. To run it, turn the ignition switch ON (II),
then turn the fan speed dial to the AUTO position. Set the temperature control dial to 60° F(18°C), then gradually move0
the dial up the temperature range to 90°F (32°C). At each temperature setting, push both the AUTO and OFF burtons
on the control unit at the same time. Wait for at least one minute for the system to readjust and check for problems.
If any problems are found in circuits “A” through “I”, the system will indicate which circuit has the problem by lighting
the respective indicator light.
NOTE: The climate control unit does not memorize which self-diagnosis indicator lights come on. If you turn the ig-
nition switch OFF, the indicator light memory will be lost.
AUTO BUTTON OFF BUTTON
TEMPERATURE
CONTROL DIAL
TEMP DISPLAY FAN SPEED DIAL
NOTE:
When you turn the ignition switch OFF, the self-diagnosis function will be canceled.
After completing repair work, run the self-diagnosis again to make sure that there are no other malfunctions.
COMPONENT WITH PROBLEM
IN-CAR TEMPERATURE SENSOR
OUTSIDE AIR TEMPERATURE
SENSOR
SUNLIGHT SENSOR
HEATER CORE TEMPERATURE
SENSOR
EVAPORATOR TEMPERATURE
SENSOR
AIR MIX CONTROL MOTOR
MODE CONTROL MOTOR
RECIRCULATION CONTROL MOTOR
VENT DOOR CONTROL MOTOR
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
Refer to PAGE
22-16
22-18
22-20
22-22
22-24
22-26
22-28
22-30
22-32
INDICATOR
MODE
A/C
ON (A/C)
OFF (A/C)
LED on
defroster
button
A
B
C
D
E
F
G
H
I
Self-diagnosis Circuit Check
The Automatic Climate Control System has a built-in self diagnosis feature. To run it, turn the ignition switch ON (II),
then turn the fan speed dial to the AUTO position. Set the temperature control dial to 60° F(18°C), then gradually move0
the dial up the temperature range to 90°F (32°C). At each temperature setting, push both the AUTO and OFF burtons
on the control unit at the same time. Wait for at least one minute for the system to readjust and check for problems.
If any problems are found in circuits “A” through “I”, the system will indicate which circuit has the problem by lighting
the respective indicator light.
NOTE: The climate control unit does not memorize which self-diagnosis indicator lights come on. If you turn the ig-
nition switch OFF, the indicator light memory will be lost.
AUTO BUTTON OFF BUTTON
TEMPERATURE
CONTROL DIAL
TEMP DISPLAY FAN SPEED DIAL
NOTE:
When you turn the ignition switch OFF, the self-diagnosis function will be canceled.
After completing repair work, run the self-diagnosis again to make sure that there are no other malfunctions.
COMPONENT WITH PROBLEM
IN-CAR TEMPERATURE SENSOR
OUTSIDE AIR TEMPERATURE
SENSOR
SUNLIGHT SENSOR
HEATER CORE TEMPERATURE
SENSOR
EVAPORATOR TEMPERATURE
SENSOR
AIR MIX CONTROL MOTOR
MODE CONTROL MOTOR
RECIRCULATION CONTROL MOTOR
VENT DOOR CONTROL MOTOR
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
Refer to PAGE
22-16
22-18
22-20
22-22
22-24
22-26
22-28
22-30
22-32
INDICATOR
MODE
A/C
ON (A/C)
OFF (A/C)
LED on
defroster
button
A
B
C
D
E
F
G
H
I