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TROUBLE DIAGNOSIS
ATC-45
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5.STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
1. Turn the temperature dial clockwise.
2. Does code No.20 appear on the display?
Ye s o r N o
Ye s > > G O T O 6 .
No >> GO TO 14.
6.STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
1. Turn the temperature dial clockwise.
2. Does code No.30 appear on the display?
Ye s o r N o
Ye s > > G O T O 7 .
No >> GO TO 15.
7.STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED
1. Turn the temperature dial clockwise.
2. Press DEF switch, code No. of each actuator test is indicated on
the display.
>> GO TO 8.
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ATC-46
TROUBLE DIAGNOSIS
8. CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air tem-
perature, blower motor voltage and compressor operation.
Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
OK or NG
OK >> GO TO 9.
NG >>
●Air outlet does not change.
Go to AT C - 5 9 , "
Mode Door Motor Circuit" .
●Intake door does not change.
Go to AT C - 6 6 , "
Intake Door Motor Circuit" .
●Blower motor operation is malfunctioning.
Go to AT C - 6 9 , "
Blower Motor Circuit" .
●Magnet clutch does not engage.
Go to AT C - 7 5 , "
Magnet Clutch Circuit" .
●Discharge air temperature does not change.
Go to AT C - 6 3 , "
Air Mix Door Motor Circuit" .
9. STEP 5 - TEMPERATURE OF EACH SENSOR IS CHECKED
1. Turn the temperature dial clockwise.
2. Code No.51 appears on the display.
>> GO TO 10.
RHA280I
41 42 43 44 45 46
Mode door position VENT B/L B/L FOOT D/F DEF
Intake door position REC REC 20% FRE FRE FRE FRE
Air mix door position FULL COLD FULL COLD FULL HOT FULL HOT FULL HOTFULL HOT
Blower fan Approx. 4.5V Approx. 10.5V Approx. 8.5V Approx. 8.5V Approx. 8.5V Approx. 12V
Compressor ON ON OFF OFF ON ON
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TROUBLE DIAGNOSIS
ATC-47
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10.CHECK AMBIENT SENSOR
Press (DEF) switch one time, temperature detected by ambient
sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 11.
NG >> Go to ATC-100, "
Ambient Sensor Circuit" .
11 . CHECK IN-VEHICLE SENSOR
Press (DEF) switch the second time, temperature detected by in-
vehicle sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 12.
NG >> Go to ATC-102, "
In-vehicle Sensor Circuit" .
12.CHECK INTAKE SENSOR
Press (DEF) switch the third time, temperature detected by intake
sensor is indicated on the display.
NOTE:
If temperature shown on display greatly differs from actual tempera-
ture, check sensor circuit first, then inspect sensor.
OK or NG
OK >> GO TO 13.
NG >> Go to ATC-108, "
Intake Sensor Circuit" .
13.CHECK MULTIPLEX COMMUNICATION ERROR
1. Press REC (Recirculation) switch.
2. Multiplex communication error between AV AND NAVI CON-
TROL UNIT (or DISPLAY) and auto amp. is detected.
(If plural errors occur, the display of each error will blink two times for
0.5 second intervals.)
OK or NG
OK >> 1. Turn ignition switch OFF or (AUTO) switch ON.
2. END
NG >> Go to ATC-109, "
Multiplex Communication Circuit" .
RJIA0755E
RJIA0758E
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ATC-48
TROUBLE DIAGNOSIS
14. CHECK MALFUNCTIONING SENSOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively two times.)
*1: Conduct self-diagnosis STEP 2 under sunshine.
When conducting indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No.25 will indicate
despite that sunload sensor is functioning properly.
*2: ATC-100, "
Ambient Sensor Circuit" .
*3: ATC-102, "
In-vehicle Sensor Circuit" .
*4: ATC-108, "
Intake Sensor Circuit" .
*5: ATC-105, "
Sunload Sensor Circuit" .
*6: AT C - 6 3 , "
Air Mix Door Motor Circuit" .
>> INSPECTION END
Code No. Malfunctioning sensor (Including circuits) Reference page
21 / -21 Ambient sensor *2
22 / -22 In-vehicle sensor *3
24 / -24 Intake sensor *4
25 / -25 Sunload sensor *5
26 / -26 Air mix door motor (LCU) PBR *6
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TROUBLE DIAGNOSIS
ATC-49
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15.CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode or (and) intake door motor position switch(es) is (are) malfunctioning.
(If two or more mode or intake doors are out of order, corresponding code numbers blink respectively two
times.)
*1:If mode door motor harness connector is disconnected, the following display pattern will appear.
31→32→33→34→35→36→Return to 31
*2:If intake door motor harness connector is disconnected, the following display pattern will appear.
37→38→39→Return to 37
*3: AT C - 5 9 , "
Mode Door Motor Circuit" .
*4: AT C - 6 6 , "
Intake Door Motor Circuit" .
>> INSPECTION END
AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER
The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (displayed dig-
itally) and temperature felt by driver.
Operating procedures for this trimmer are as follows:
●Begin Self-diagnosis STEP 5 mode.
●Press (fan) UP switch to set system in auxiliary mode.
●Display shows 61 in auxiliary mechanism.It takes approximately 3 seconds.
●Turn the temperature dial as desired. Temperature will change at a rate of 1°C (2°F) each time a dial is
turned.
Code No. *1 *2 Mode or intake door position Reference page
31 VENT
Mode door motor *3 32 B/L
34 FOOT
35 D/F
36 DEF
37 FRE
Intake door motor *4 38 20% FRE
39 REC
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ATC-50
TROUBLE DIAGNOSIS
When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of initial
condition, i.e. 0°C (0°F).
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TROUBLE DIAGNOSIS
ATC-51
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Operational CheckEJS001ZI
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Set the temperature 90°F or 32°C.
2. Press OFF switch.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous tempera-
ture.
7. Press OFF switch.
If NG, go to ATC-99, "
Memory Function" .
If OK, continue with next check.
CHECKING BLOWER
1. Press fan switch (up side) one time. Blower should operate on
low speed.The fan symbol should have one blade lit .
2. Press fan switch (up side) one more time, and continue check-
ing blower speed and fan symbol until all speeds are checked.
3. Leave blower on MAX speed.
If NG, go to ATC-69, "
Blower Motor Circuit" .
If OK, continue with next check.Conditions :Engine running and at usual operating temperature
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ATC-52
TROUBLE DIAGNOSIS
CHECKING DISCHARGE AIR
1. Press mode switch four times and DEF button.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distri-
bution table. Refer to ATC-27, "
Discharge Air Flow" .
Intake door position is checked in the next step.
If NG, go to AT C - 5 9 , "
Mode Door Motor Circuit" .
If OK, continue with next check.
NOTE:
Confirm that the compressor clutch is engaged (visual inspection)
and intake door position is at FRESH when the DEF is selected.
RJIA1685E
RHA280I