Page 2937 of 3000

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–29
AC
DESCRIPTION
The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature
which is used to control the air conditioner "AUTO" mode. This sensor is connected to the A/C amplifier
and detects fluctuations in the ambient temperature. This data is used for controlling the cabin
temperature. The sensor sends a signal to the A/C amplifier. The resistance of the ambient temperature
sensor changes in accordance with the ambient temperature. As the temperature decreases, the
resistance increases. As the temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the ambient temperature sensor and reads voltage changes as
the resistance of the ambient temperature sensor changes.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
DTC B1412/12 Ambient Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1412/12 Open or short in ambient temperature sensor circuit• Ambient temperature sensor
• Harness or connector between ambient
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I008282E17
Page 2938 of 3000
AC–30AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(b) Turn the ignition switch to the ON position and turn the
intelligent tester main switch on.
(c) Select the item below in the DATA LIST, and read the
display on the intelligent tester.
DATA LIST / AIR CONDITIONER:
OK:
The display is as specified in the normal condition
column.
Result
B
C
A
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
AMBI TEMP SENS
(Ambient temperature sensor)Ambient temperature sensor /
min: -30.8
C (-23.44F), max:
50.8C (123.44F)Actual ambient temperature is
displayed-
Result Proceed to
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE A/C AMPLIFIER
Page 2939 of 3000

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–31
AC
(a) Remove the ambient temperature sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NOTICE:
• Even slightly touching the sensor may change the
resistance value. Be sure to hold the connector of
the sensor.
• When measuring, the sensor temperature must be
the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases
(see the graph).
NG
OK
2INSPECT AMBIENT TEMPERATURE SENSOR
E118395E14
Tester Connection Condition Specified Condition
A1-1 - A1-2 10
C (50F) 3.00 to 3.73 k
A1-1 - A1-2 15C (59F) 2.45 to 2.88 k
A1-1 - A1-2 20C (68F) 1.95 to 2.30 k
A1-1 - A1-2 25C (77F) 1.60 to 1.80 k
A1-1 - A1-2 30C (86F) 1.28 to 1.47 k
A1-1 - A1-2 35C (95F) 1.00 to 1.22 k
A1-1 - A1-2 40C (104F) 0.80 to 1.00 k
A1-1 - A1-2 45C (113F) 0.65 to 0.85 k
A1-1 - A1-2 50C (122F) 0.50 to 0.70 k
A1-1 - A1-2 55C (131F) 0.44 to 0.60 k
A1-1 - A1-2 60C (140F) 0.36 to 0.50 k
REPLACE AMBIENT TEMPERATURE
SENSOR
Page 2940 of 3000
AC–32AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(a) Disconnect the ambient temperature sensor connector.
(b) Disconnect the A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - A/C
AMPLIFIER)
E124473E06
E143742E26
Tester Connection Condition Specified Condition
A1-2 - A9-32 (TAM) Always Below 1
A1-1 - A9-24 (SG-6) Always Below 1
A9-32 (TAM) - Body
groundAlways 10 k or higher
A9-24 (SG-6) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER
Page 2941 of 3000
AIR CONDITIONING – BLOWER UNIT (for Rear Air Conditioning System)AC–203
AC
HEATER & AIR CONDITIONING SYSTEM
AIR CONDITIONING
BLOWER UNIT (for Rear Air Conditioning System)
COMPONENTS
C119346E01
Page 2942 of 3000
AC–204AIR CONDITIONING – BLOWER UNIT (for Rear Air Conditioning System)
AC
REMOVAL
1. DISCHARGE REFRIGERANT FROM
REFRIGERATION SYSTEM
SST 07110-58060 (07117-58080, 07117-58090,
07117-78050, 07117-88060, 07117-88070,
07117-88080)
HINT:
See page AC-172.
2. REMOVE REAR DOOR SCUFF PLATE RH (See page
IR-7)
3. REMOVE BACK DOOR SCUFF PLATE (See page IR-
8)
4. REMOVE QUARTER TRIM PANEL ASSEMBLY
FRONT RH (See page IR-9)
5. REMOVE ROOF HEADLINING GARNISH REAR (See
page IR-9)
6. REMOVE RR WINDOW SIDE GARNISH ASSEMBLY
NO.2 RH (See page IR-9)
7. REMOVE AIR DUCT ASSEMBLY
(a) Remove the 2 clips and the air duct assembly from
the air conditioning blower assembly.
8. REMOVE COVER SUB-ASSEMBLY
(a) Disengage the 2 claw fittings and remove the cover
sub-assembly.
9. REMOVE AIR DUCT ASSEMBLY
(a) Remove the air duct assembly.
I044287E01
I044288E01
I044296
Page 2943 of 3000
AIR CONDITIONING – BLOWER UNIT (for Rear Air Conditioning System)AC–205
AC
10. DISCONNECT HEATER HOSE
(a) Release the claw fittings and release the heater
hose clamp.
(b) Using pliers, grip the claws of the 2 clips and slide
the clip to disconnect the 2 heater hoses.
11. DISCONNECT AIR CONDITIONING TUBE AND
ACCESSORY ASSEMBLY
(a) Remove the 2 bolts and disconnect the air
conditioning tube & accessory assembly.
12. REMOVE AIR CONDITIONING BLOWER ASSEMBLY
(a) Disconnect the 4 connectors, release the 3 clamps
and separate the wire harness.
(b) Remove the 3 bolts and the air conditioning blower
assembly.
I044298
I035487
I044299E01
I044300
Page 2944 of 3000
AC–206AIR CONDITIONING – BLOWER UNIT (for Rear Air Conditioning System)
AC
DISASSEMBLY
1. REMOVE COOLER THERMISTOR NO.1 (for
Automatic Air Conditioning System)
(a) Disengage the 2 claw fittings and the clamp and
remove the cooler thermistor No. 1.
2. REMOVE COOLING UNIT MOTOR SUB-ASSEMBLY
WITH FAN
(a) Remove the 3 screws and the cooling unit motor
sub-assembly w/ fan.
3. REMOVE BLOWER RESISTOR TRANSISTOR
ASSEMBLY
(a) Remove the 2 screws and the blower resistor
transistor assembly.
4. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY
(a) Disengage the claw fitting and remove the 3 screws
and blower case.
(b) Remove the 2 screws and the 2 clamps.
I035490E01
I044285
I035492
I035497E01
E055396