1991 LEXUS SC400 Service Repair Manual

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Page 105 of 4087

LEXUS SC400 1991 Service Repair Manual
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 cont

Page 106 of 4087

LEXUS SC400 1991 Service Repair Manual
Check voltage between terminals TPM and SG of air conditioner control
assembly connector.
(1) Remove console upper panel.(See page BO-111 ).
(2) Remove A/C control assembly with
connectors still co

Page 107 of 4087

LEXUS SC400 1991 Service Repair Manual
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 assembl

Page 108 of 4087

LEXUS SC400 1991 Service Repair Manual
Actuator check.
(1) Set to the actuator check mode(See page AC-30).
(2) Press the FRS switch and change it to step operation.
Press FRS switch and check the
condition of the

Page 109 of 4087

$LEXUS SC400 1991 Service Repair Manual IG Power Source Circuit CIRCUIT DESCRIPTION This is the power source for the air conditioner control assembly (contains\ the A/C control assembly) and servomotor, ect. DIAGNOSTIC CHART WIRING DIAGRA$

Page 110 of 4087

LEXUS SC400 1991 Service Repair Manual
Check voltage between terminals IG+ and E of air conditioner control
assembly connector.
(1) Remove console upper panel.(See pageBO-111 ).
(2) Remove A/C control assembly with connec±
tors still

Page 111 of 4087

$LEXUS SC400 1991 Service Repair Manual ACC Power Source Circuit CIRCUIT DESCRIPTION This circuit supplies power to the air conditioner control assembly (contai\ ns the A/C control assembly). DIAGNOSTIC CHART WIRING DIAGRAM Check voltage b$

Page 112 of 4087

LEXUS SC400 1991 Service Repair Manual
Check voltage between terminals ACC of air conditioner control
assembly connector and body ground.
(1) Remove console upper panel.(See page BO-111 ).
(2) Remove A/C control assembly with connec±
t

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