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AIR CONDITIONING 1BÐ99
*2. Displaying the Past Trouble Diagnosing Table
The past trouble diagnosis displays only the items on which trouble has recurred 16 times in the past.
If you press the air conditioning switch once while the current trouble diagnosis is taking place, display
of the past trouble diagnosis will appear on the indicator lamp (LED) of the air conditioning switch.
Results of the diagnosis along the following five items are displayed one by one in 0.5 second interval
irrespective of presence or absence of a trouble. A failed item is indicated by flashing of the LED that is
repeated 3 times within 0.5 seconds. You can locate the failed section by counting in what sequence it
has been displayed.
Items for Past Trouble Diagnosis
LED on
LED off Indication for presence of a trouble Indication for normal state
0.5 0.5 0.5
3 second interval
Display pattern
ON
OFFNormal pattern
In car sensor
Ambient sensor
Sun sensor
Duct sensor
Mix actuatorFailed part
F01RX011
F01RY00007
*3. Check of Output Equipment
FAN
MIX
MODE
DOOR
INTAKE
DOOR
SET UP
TEMPERATURE
100
(%)
33.5
F/H
VENT
B/L
FOOT
D/F
DEF
REC
MIX
FRE
F/C 20 21 22 23 24 25 26 27 28 29 30 F/H (%)
F/C
F01RY00001
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1BÐ100 AIR CONDITIONING
Independent check of sensors
Replace the control unit.
Sensors Allowable range Check method
In car sensor
Ambient sensor
Sun sensorRefer to the sensor resistance curve.
Refer to the sensor resistance curve.
100 ohms maximum in forward and 0.02 mA
minimum when exposed to 60W incandescent lamp.Chart 1
Chart 2
Chart 3
Replace the harness and
connector.
Replace the sensors.
Check the related harness and
connector
Normal ?
Normal ?NONO YES
YES
INSPECTION BY FAILED LOCATION
Inspection of the Sensors
When the self-diagnosis function has determined that trouble is present on the sensors, check them
according to the following flow chart.
F01RY00005
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AIR CONDITIONING 1BÐ101
Chart 1: In Car Sensor
NOReplace the sensor.
NODisconnection of the harness.
Failure on the automatic heater/air
conditioner control unit.
YES
Disconnect the in car sensor connector (I-34).
YES
Is the sensor performance normal? (refer to
the later section on "Check Up")
Are conduction provided between the
following connector terminals on chassis
harness side?:
No.3 and No.1 .
No.4 and No.11 .
I-33I-34
I-33I-34
I-33I-34
1
112
123
134
145
156
167
178
189
1910
20
0.3 BR/B
0.5 B/L
111
In car Sensor Auto A/C Control Unit
(In car Sensor)
(Sensor GND)4 3
I-33I-34
12 43
D08RY00174
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1BÐ102 AIR CONDITIONING
Chart 2: Ambient Sensor
NOReplace the ambient sensor.
NOFailure on the harness.
Connect the ambient sensor connector.
Replace the automatic heater/air conditioner
control unit.
YES
Disconnect the Ambient sensor connector
(C-86).
YES
Is performance of the ambient sensor
normal? (Refer to the later section on
"Check Up".)
Is resistance between the following
connectors normal?
No.2 and No.11 .
I-33I-33
I-33C-86
H-24
1
112
123
134
145
156
167
178
189
1910
20
0.3 LG/B
0.3 B/L
112
Ambient Sensor Auto A/C Control Unit
(Ambient Sensor)
(Sensor GND)I-330.3 LG/B
0.3 B/LH-24 8
H-24 9
C-86 1
C-86 2
17 18 16 15 1478 6 5
12 13 11 10 94 132
5 6 7 8
15 16 17 18 142 3 41
10 11 12 13 9
12
D08RY00176
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AIR CONDITIONING 1BÐ103
Chart 3: Sun Sensor
NOReplace the sun sensor.
NOReplace the harness.
Replace the automatic heater/air conditioner
control unit.
YES
Disconnect the sun sensor connector (I-35).
YES
Is performance of the sun sensor normal?
(Refer to the later section on "Check Up".)
Is the conduction provided between the
following chassis harness side connector
terminals?
No.3 and No.1 .
No.11 and No.2 .
I-35I-33
I-35I-33
0.3 LG/W
0.3 B/L
113
Sun Sensor Auto A/C Control Unit
(Sun Sensor)
(Sensor GND)I-33I-351
I-352
I-33I-35
211
112
123
134
145
156
167
178
189
1910
20
D08RY00177
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1BÐ104 AIR CONDITIONING
Inspection of the Intake Actuator System
B-19I-32
B-36
H-26H-13
I-49I-33
12345678
9 101112131415161
112
123
134
145
156
167
178
189
1910
20
10 11 12 13 14 151234 5
17 18 19 206789
16
9876
20 19 18 17 165
14 154
133
122
111
10
B-36
12
34
M
FL-1 80A
MAIN
11
0.5 L/O STARTER RELAY
I-33
11
12
13
14
0.3 L/R 0.5 L/W0.3 B/L
0.3 L/Y
Intake Actuator
Auto A/C Control Unit
BATT.
(Intake Actuator)
GND(COM)
CIRC
FRESHMIXI-322 1
4 3
0.5 BR 0.5 BR 3.0 L/R
C-20 10A
A/CI-49 3
H-13 10
I-49 4
I-49 5
I-49 6
I-49 1
I-49 2
H-2614
B-19
1
34 562
362
51
4 123
45 6
Type of the
trouble
Control failure.
Chart B
Does not work at all.
Chart A
D08RY00178
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AIR CONDITIONING 1BÐ105
Chart A: Does Not Work At All
NOFailure on the power supply circuit.
NOFailure on the actuator.
NOThe harness is disconnected.
NOReplace the automatic heater/air conditioner
control unit.
YES
YES YES
YES
Turn on the ignition switch (the engine is
started).
Switch between the fresh air intake and the
interior air circulation.
Failure on the intake link unit (intake door
lock).
Is the battery voltage present between the
chassis harness side connector terminal
No.3 and the ground?
I-49
Is the battery voltage present between
the chassis harness side connector
terminal No.4 and the ground?
I-49
Is the battery voltage present between
the chassis harness side connector
terminal No.11 and the ground?
I-32
During the above switch operations, did
the voltage between the chassis harness
side connector terminal No.11 and
the ground go below 0.5V?
I-32
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1BÐ106 AIR CONDITIONING
Chart B: Failure on the Intake Control
NOThe harness is disconnected.
NOFailure on the automatic heater/air
conditioner control unit.
NOFailure on the automatic heater/air
conditioner control unit.
YES YES
YES
Turn on the ignition switch (the engine is
started).
Disconnect the intake actuator connector
(I-49).
Failure on the intake actuator.
Is the intake actuator stopped?
Is conduction provided between the
following chassis harness side connector
terminals?
No.5 and No.11 .
No.6 and No.12 .
No.1 and No.13 .
No.2 and No.14 .
I-33I-49
I-33I-49
I-33I-49
I-33I-49
Is voltage (approximately 5V) present
between the following?
No.12 and the ground.
No.13 and the ground.
No.14 and the ground.
I-33
I-33
I-33