Operation Procedure

STEP 1: CHECKS L.E.D.S AND SEGMENTS





- When the L.E.D. of the switch and segments are in good order in STEP 1 mode, the corresponding L.E.D.'s and fluorescent display tube will illuminate.





- If L.E.D.'s or segments malfunction, L.E.D.'s will not come on or display shows incomplete segments.





STEP 2: CHECKS EACH SENSOR CIRCUIT FOR OPEN OR SHORT CIRCUIT
- Display shows "2 " in STEP 2 mode.
- When all sensors are in good order, display shows "20". It takes approximately 4 seconds to check all sensors.





- If a sensor is malfunctioning, the corresponding code number blinks on display.
- A short circuit is identified by a blinking "-" mark preceding mode number.





- If two or more sensors malfunction, corresponding code numbers respectively blink two times.

Sensors And Abnormalities:

- If a circuit is opened or shorted, display shows its code number when input corresponds with any of the following conditions.

STEP 3: CHECKS MODE DOOR POSITION





- Display shows "3 " in STEP 3 mode.
- When all doors are in good order, display will then show "30".

- It takes approximately 16 seconds to check all mode doors.





- When abnormalities are detected, display shows a code number corresponding with malfunctioning part.

STEP 3 CODES:

- If two or more mode doors are out of order, corresponding code numbers respectively blink two times.
- If any mode door motor position switch is malfunctioning, mode door motor will also malfunction.

STEP 4: CHECKS OPERATION OF EACH ACTUATOR





- Display shows"41" in STEP 4 mode.
- When (DEF) switch is pressed one time, display shows "42". Thereafter, each time the switch is pressed, display advances one number at a time, up to "46", then returns to "41".





- During inspection in STEP 4 mode, auto amplifier will forcefully transmit an output to the affected actuators in response to code number shown on display.
- Checks will be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for improper operation.

NOTE: Operating condition of each actuator cannot be checked by indicators.

STEP 5: CHECKS TEMPERATURE DETECTED BY SENSORS





- Display shows "5 " in STEP 5 mode.





- When (DEF) switch is pressed one time, display shows temperature detected by the ambient sensor.
- When (DEF) switch is pressed the second time, display shows temperature detected by the in-vehicle sensor.
- When (DEF) switch is pressed the third time, display shows the temperature detected by the intake sensor.





- When (DEF) switch is pressed the fourth time, display returns to original presentation, "5 ".

NOTICE: If temperature shown on the display greatly differs from the actual temperature, check sensor circuit at first, and then inspect the sensor itself.

AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER

- This trimmer compensates for differences between temperature setting (displayed digitally) and temperature felt by the driver in a range of +/- 3°C (+/-6°F).

Auxiliary Mechanism: Temperature Setting Trimmer:

- Operating procedures for this trimmer are as follows:

-Starting with STEP 5 under "Self-diagnosis mode", press fan switch to set air conditioning system in auxiliary mode.

-Then, press either ^ (HOT) or v (COLD) switch as desired. Temperature will change at a rate of 0.5°C (1°F) each time the switch is pressed.

NOTE: When battery cable is disconnected, trimmer operation is canceled and temperature set becomes that of initial condition i.e, 0°C (0°F).