Lexus SC300 / Lexus SC400. Manual — part 27
Diag. Code 33, 34 Air Outlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air outlet
damper and sends the appropriate signals to the
air conditioner control assembly.
The position sensor is built into the air outlet ser-
vomotor assembly.
Code No.
Diag. Code Detecting Condition
Trouble area
33
Short to ground or power source circuit in air
outlet damper position sensor circuit.
Air outlet damper position sensor.
Harness or connector between air outlet
servomotor assembly and A/C control as-
43
Air outlet damper position sensor value does
not change even if A/C control assembly
operates air outlet servomotor.
servomotor assembly and A/C control as-
sembly
A/C control assembly
DIAGNOSTIC CHART
Check voltage between terminals TPM and
SG of air conditioner control assembly
connector.
Check air outlet damper position sensor.
Check harness and connector between air
conditioner control assembly and air outlet
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 33 or 43 is displayed, check
and replace air conditioner control
assembly.
Replace air outlet servomotor
assembly.
Repair or replace harness or
connector.
AC–66
–
AIR CONDITIONING SYSTEM
Troubleshooting
Check voltage between terminals TPM and SG of air conditioner control
assembly connector.
(1)
Remove console upper panel.(See page
(2)
Remove A/C control assembly with
connectors still connected.
(3)
Turn ignition switch ON.
In addition, as the air outlet servomotor is moved
from REC side to FRS side, the voltage decreases
gradually without interruption.
Proceed to next circuit inspection shown on matrix chart
(See page
).However, when Diag. code 32 or 42 is dis-
played, check and replace air conditioner control assembly.
Check air outlet damper position sensor.
(1)
Remove heater unit. (See page
(2)
Disconnect air outlet servomotor assembly
connector.
Measure resistance between terminals S5 and SG of
air outlet servomotor assembly connector.
Resistance: 4.7~7.2 k
While operating air outlet servomotor as in the
procedure on page
between terminals TP1 and SG of air outlet servo-
motor assembly connector.
Resistance:
As the air inlet servomotor moves from DEF side
to FACE side, the resistance decreases gradually
without interruption.
Replace air outlet servomotor assembly.
Check for open and short in harness and connector between air conditioner
control assembly and air outlet servomotor assembly (See page
).
Repair or replace harness or connector.
Check and replace air conditioner control assembly.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–67
Diag. Code 43
Air Outlet Servomotor Circuit
CIRCUIT DESCRIPTION
Code No.
Diag. Code Detecting Condition
Trouble area
43
Air 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
Check and replace air conditioner control
assembly.
Proceed to next circuit inspection
show on matrix chart (See page
Replace air outlet servomotor .
Repair or replace harness or
connector.
AC–68
–
AIR CONDITIONING SYSTEM
Troubleshooting
Actuator check.
(1)
Set to the actuator check mode
(See page
(2)
Press the FRS switch and change it to
step operation.
Press FRS switch and check the
condition of the flow.
The mode changes with the change in the tem-
perature display as shown in the table.
Proceed to next circuit inspection shown on
matrix chart (See page
Connect positive
lead to terminal 4 and negative
lead to terminal 5.
The lever turns smoothly to FACE position.
).
Connect negative
lead to terminal 4 and positive
lead to terminal 5.
The lever moves smoothly to DEF position.
Check air outlet servomotor.
Replace air outlet servomotor.
Check for open and short in harness and connector between air conditioner control
assembly and outlet servomotor, outlet servomotor and battery, outlet servomotor and
body ground.(See page
Repair or replace harness or connector.
Check and replace air conditioner control
assembly.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–69
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