Lexus SC300 / Lexus SC400. Manual — part 26
Diag. Code 32, 42
Air Inlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air inlet
damper and sends the appropriate signals to the
air conditioner control assembly.
The position sensor is built into the air mix servo-
motor assembly.
Code No.
Diag. Code Detecting Condition
Trouble area
32
Short to ground or power source circuit in air
inlet damper position sensor circuit.
Air inlet damper position sensor.
Harness or connector between air inletser-
vomotor assembly and A/C controlassem-
42
Air inlet damper position sensor value does not
change even if A/C control assembly operates
air inlet servomotor.
vomotor assembly and A/C controlassem-
bly
A/C control assembly
DIAGNOSTIC CHART
Check voltage between terminals TP1 and SG
of air conditioner control assembly
connector.
Check air inlet damper position sensor.
Check harness and connector between air
conditioner control assembly and air inlet
servomotor assembly (See page
Check and replace air conditioner control
assembly.
Proceed to next circuit inspection
shown on matrix chart (See page
). However, when Diag.
code 32 or 42 is displayed, check
and replace air conditioner control
assembly.
Replace air inlet servomotor
assembly.
Repair or replace harness or
connector.
AC–62
–
AIR CONDITIONING SYSTEM
Troubleshooting
Check voltage between terminals TP1 and SG of air conditioner control
assembly connector.
(1)
Remove console upper panel.
(See page
(2)
Remove A/C control assembly with connec–
tors still connected.
(3)
Turn ignition switch ON.
Press REC/FRS switch to change the air inlet
between fresh and recirculation air, and measure
voltage between terminals TP1 and SG of air
conditioner control assembly when the air inlet
servomotor operates.
In addition, as the air inlet servomotor is moved
from REC side to FRS side, the voltage de-
creases gradually without interruption.
Proceed to next circuit inspection shown on matrix chart
(See page
).However, when Diag. code 32 or 42 is
displayed, check and replace air conditioner control assem-
bly.
Check air inlet damper position sensor.
(1)
Remove heater unit. (See page
)
(2)
Disconnect air inlet servomotor assembly
connector.
Measure resistance between terminals S5 and SG of
air inlet servomotor assembly connector.
Resistance: 4.7~7.2 k
While operating air inlet servomotor as in the
procedure on page
, measure resistance
between terminals TP1 and SG of air inlet servo-
motor assembly connector.
Resistance:
As the air inlet servomotor moves from REC side
to FRS side, the resistance decreases gradually
without interruption.
Replace air inlet servomotor assembly.
Check for open and short in harness and connector between air conditioner
control assembly and air inlet servomotor assembly (See page
Repair or replace harness or connector.
Check and replace air conditioner control assembly.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
REPAIR INSTRUCTIONS
AC–63
Diag. Code 42
Air Inlet Servomotor Circuit
CIRCUIT DESCRIPTION
The air inlet servomotor is controlled by the air conditioner control assembly and moves the air inlet
damper to the desired position.
Code No.
Diag. Code Detecting Condition
Trouble area
42
Air inlet damper position sensor value does
not change even if A/C control assembly oper-
ated air inlet servomotor
Air inlet damper position sensor.
Harness or connector between air inlet ser-
vomotor assembly and A/C control assem-
bly.
A/C control assembly
DIAGNOSTIC CHART
Actuator check.
Check air inlet servomotor.
Check harness and connector between air
conditioner control assembly and air inlet ser-
vomotor assembly (See page
).
Check and replace air conditioner control
assembly.
Proceed to next circuit inspection
shown on matrix chart (See page
).
Replace air inlet servomotor
assembly.
Repair or replace harness or
connector.
AC–64
–
AIR CONDITIONING SYSTEM
Troubleshooting
Actuator check.
Proceed to next circuit inspection shown on
matrix chart (See page
Check air inlet servomotor.
Remove cooling unit.
Connect positive
lead to terminal 6 and negative
lead to terminal 2.
The lever moves smoothly to REC position.
Connect negative
lead to terminal 6 and positive
lead to terminal 2.
The lever moves smoothly to FRS position.
Replace air inlet servomotor assembly.
Check for open and short in harness and connector between air conditioner
control assembly and air inlet servomotor assembly (See page
Repair or replace harness or connector.
Check and replace air conditioner control
assembly.
(1)
Remove glove box to see and check the air
inlet damper operation
(2)
Set to the actuator check mode
(See page
(3)
Press the FRS switch and check it to step
operation.
Press the FRS switch and change it to step opera-
tion.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–65
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