1991 LEXUS SC400 sensor

Diag. Code 43Air Outlet Servomotor Circuit
CIRCUIT DESCRIPTION
Code No.Diag. Code Detecting ConditionTrouble area
43Air outlet damper position sensor value does not
change even if A/C control assembly operated air
outlet servomotor.
Air outlet servomotor.

Air outlet damper position sensor.

Harness or connector between A/C control
assembly air outlet servomotor, air outlet
damper position sensor.

A/C control assembly
DIAGNOSTIC CHART
Actuator check.
Check air outlet servomotor.
Check harness and connector between air
conditioner control assembly and air outlet
servomotor, air outlet servomotor and bat-
tery, air outlet servomotor and body ground.
(See page IN-27).
Check and replace air conditioner control
assembly.
Proceed to next circuit inspection
show on matrix chart (See page
AC-36 ).
Replace air outlet servomotor .
Repair or replace harness or
connector.
AC±68±
AIR CONDITIONING SYSTEM Troubleshooting
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8. PULL FLOOR CARPET DOWN AND REMOVECOMPUTER COVER
9. REMOVE EVAPORATOR COVER AND FOOT AIR DUCT BOLT
10. REMOVE EVAPORATOR (a) Remove six bolts and down the lower case.
(b) Pull and remove the evaporator.
(c) Pull out the evaporator sensor from the evaporator fins.
(d) Remove two bolts using a hexagon wrench and separate the evaporator and expansion valve.
INSPECTION OF EVAPORATOR
1. INSPECT FINS FOR BLOCKAGE
If the fins are clogged, clean them with compressed air.
NOTICE: Never use water to clean the evaporator.
2. INSPECT FITTINGS FOR CRACKS OR SCRATCHES Repair as necessary.
±
AIR CONDITIONING SYSTEM EvaporatorAC±123
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BLOWER RESISTOR
REMOVAL OF BLOWER RESISTOR
1. REMOVE GLOVE BOXSee page BO±112
2. REMOVE RESISTOR
(a) Disconnect the connector.
(b) Remove the two screws and the resistor.
INSPECTION OF BLOWER RESISTOR
See page AC±80
INSTALLATION OF BLOWER RESISTOR
1. INSTALL RESISTOR
(a) Install the resistor with two screws.
(b) Connect the connector.
2. INSTALL GLOVE BOX
See page BO±112
ROOM TEMPERATURE SENSOR
REMOVAL OF ROOM TEMPERATURE
SENSOR
1. REMOVE NO. 1 LOWER FINISH PANEL
See page BO±112
2. REMOVE SENSOR Remove the screw and the sensor.
INSPECTION OF ROOM TEMPERATURE
SENSOR
See page AC±44
INSTALLATION OF ROOM
TEMPERATURE SENSOR
1. INSTALL SENSOR
Install the sensor with one screw.
2. INSTALL NO. 1 LOWER FINISH PANEL
See page BO±112
AC±132
±
AIR CONDITIONING SYSTEM Blower Resistor, Room Temperature Sensor
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AMBIENT TEMPERATURE SENSOR
REMOVAL OF AMBIENT TEMPERATURE
SENSOR
1. REMOVE ENGINE UNDER COVER
2. REMOVE SENSOR
(a) Remove the clip and the sensor.
(b) Disconnect the connector.
INSPECTION OF AMBIENT
TEMPERATURE SENSOR
See page AC±46
INSTALLATION OF AMBIENT
TEMPERATURE SENSOR
1. INSTALL SENSOR
(a) Connect the connector.
(b) Install the sensor with the clip.
2. INSTALL ENGINE UNDER COVER
±
AIR CONDITIONING SYSTEM Ambient Temperature SensorAC±133
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SOLAR SENSOR
REMOVAL OF SOLAR SENSOR
1. REMOVE NO. 1 DEFROSTER GARNISHSee page BO±109
2. REMOVE SENSOR Push out the sensor from the garnish.
INSPECTION OF SOLAR SENSOR
See page AC±52
INSTALLATION OF SOLAR SENSOR
1. INSTALL SENSOR TO NO. 1 DEFROSTER GARNISH
2. INSTALL NO. 2 DEFROSTER GARNISH
See page BO±109
EVAPORATOR TEMPERATURE
SENSOR
REMOVAL OF EVAPORATOR
TEMPERATURE SENSOR
1. REMOVE EVAPORATOR
See page AC±122
2. REMOVE SENSOR FROM EVAPORATOR
INSPECTION OF EVAPORATOR
TEMPERATURE SENSOR
See page AC±48
INSTATION OF EVAPORATOR
TEMPERATURE SENSOR
1. INSTALL SENSOR TO EVAPORATOR
2. INSTALL EVAPORATOR
See page AC±124
AC±134
±
AIR CONDITIONING SYSTEM Solar Sensor, Evaporator Temperature Sensor
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REVOLUTION DETECTING SENSOR
INSPECTION OF REVOLUTION
DETECTING SENSOR
See page AC±55
REMOVAL OF REVOLUTION DETECTING
SENSOR
1. REMOVE COMPRESSOR
See page AC±111
2. REMOVE SENSOR Remove the two bolts and the sensor.
INSTALLATION OF REVOLUTION
DETECTING SENSOR
1. INSTALL SENSORUsing a torque wrench, tighten the bolts.
Specified Torque: 6 N Vm (60 kgf Vcm, 4 ft Vlbf)
2. INSTALL COMPRESSOR
See page AC±117
±
AIR CONDITIONING SYSTEM Revolution Detecting SensorAC±135
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WATER TEMPERATURE SENSOR
REMOVAL OF WATER TEMPERATURE
SENSOR
1. REMOVE A/C UNITSee page AC±107
2. REMOVE SENSOR After taking off the clamp, take out the sensor.
INSPECTION OF WATER TEMPERATURE
SENSOR
See page AC±51
INSTALLATION OF WATER
TEMPERATURE SENSOR
1. INSTALL SENSOR TO A/C UNIT
Install the sensor with the clamp.
2. INSTALL A/C UNIT See page AC±108
PRESSURE SWITCH
INSPECTION OF PRESSURE SWITCH
See page AC±57
REMOVAL OF PRESSURE SWITCH
1. RECOVER REFRIGERANT IN REFRIGERANT SYSTEM
See page AC±16
2. REMOVE PRESSURE SWITCH
(a) Disconnect the connector.
(b) Remove the pressure switch from the liquid tube. HINT: Lock the switch mount on the tube with an open end
wrench, being careful not to deform the tube, and remove the
switch.
AC±136
±
AIR CONDITIONING SYSTEM Water Temperature Sensor, Pressure Switch
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Diag. Code 14\
 \
Open in Squib Circuit
DIAGNOSTIC CHARTDIAGNOSTIC CHART
The squib circuit consists of the center airbag sensor assembly, spiral cable and the steering wheel pad
(squib). It causes the airbag to deploy when the airbag deployment con\
ditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENT\
S on page AB±5.
Diagnostic code 14 is recorded when an open is detected in the squib cir\
cuit.
 Code No.\
 \
Diagnosis
 



14
\
 
\


\

\


Open circuit in D+ wire harness or D wire harness of squib.
 Squib malfunction.
 Spiral cable malfunction.
 Center airbag sensor assembly malfunction.
AB±62±
SRS AIRBAG Troubleshooting
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