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This procedure will test all servos, vents and dampers in the auto climate control system. Any errors will display as 2-digit codes, which can be found in the service manual:

CHECK MODE PROCEDURE
1. PANEL DIAGNOSIS (INDICATOR CHECK)
(a) Turn the ignition switch to LOCK.
(b) Turn the ignition switch ON while simultaneously
pressing the A/C control AUTO switch and the REC/
FRS switch.
(c) Check that all indicators and the display area are
turned on and off 4 times in succession at 1 second
intervals.

HINT:
After the indicator check is completed, the system
automatically enters sensor check mode.
(d) Press the OFF switch to terminate the panel
diagnosis.
2. PANEL DIAGNOSIS (SENSOR CHECK)
(a) Perform the indicator check.
HINT:
After the indicator check is completed, the system
automatically enters sensor check mode.
(b) Press the REC/FRS switch to enter actuator check
mode.
(c) After the actuator check is completed, press the
AUTO switch to enter sensor check mode.
NOTICE:
The sensor check must be performed again after
the actuator check is completed because sensor
check mode, which starts automatically after the
indicator check, cannot fully detect
malfunctions.
(d) Check the sensor check results displayed on the set
temperature display.

HINT:
• The illustration shows the display when code 21
is output.
• When 2 or more sensor check codes are
detected, the codes are displayed in ascending
numerical order.
• In cases with 2 or more codes, if they are difficult
to read, press the DEF switch to activate the step
operation and display them one by one.
• The codes are displayed in ascending numerical
order as the DEF switch is pressed.
(e) When any sensor check codes are displayed, refer
to the DTC chart (see page AC-39).
(f) Press the OFF switch to terminate the panel
diagnosis.
HINT:
Pressing the REC/FRS switch returns the system to
actuator check mode.

3. PANEL DIAGNOSIS (CLEAR SENSOR CHECK CODE)
(a) Inspect, and repair or replace the malfunctioning
parts.
(b) Clear the sensor check codes.

(1) While pressing the DEF switch during sensor
check mode, press the Rr DEF switch.
HINT:
Sensor check codes can be cleared by removing
the ECU-B2 fuse from the engine room No. 2
relay block for more than 60 seconds.
(c) Perform the sensor check and confirm that normal
code 00 is displayed.

4. PANEL DIAGNOSIS (ACTUATOR CHECK)
(a) Start the engine and warm it up.
(b) Perform the indicator check.
(c) When the sensor check is started after the indicator
check, press the REC/FRS switch to start the
actuator check.
HINT:
Perform the actuator check with the engine running.
(d) Check the temperature and blower levels by hand at
each step while the actuator check proceeds from
step 0 to 9 at 1 second intervals (continuous
operation).

HINT:
Each step number is displayed on the set
temperature display.
(e) To display step numbers one by one manually,
press the DEF switch to activate the step operation.
The step number changes each time the DEF
switch is pressed.
HINT:
• Each step number blinks at 1 second intervals
during the step operation.
• The illustration shows the display when step
number 5 is displayed.
(f) Press the OFF switch to terminate the panel
diagnosis.
HINT:
Pressing the AUTO switch returns to sensor check
mode. __________________
 
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