1991 LEXUS SC400 Service Repair Manual

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Page 97 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 31, 41Air Mix Damper Position Sensor Circuit CIRCUIT DESCRIPTION This sensor detects the position of the air mix damper and sends the appropriate signals to the air conditioner control ass

Page 98 of 4087

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

Page 99 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 41Air Mix Servomotor Circuit CIRCUIT DESCRIPTION The air mix servomotor is controlled by the A/C control assembly and moves \ the air mix damper to the desired position. Code No.Diag. Code

Page 100 of 4087

LEXUS SC400 1991 Service Repair Manual Actuator check. (1) Warm up the engine. (2) Set to the actuator check mode (See pageAC-30 ). (3) Press the FRS switch and change it to step operation. Press the FRS switch a

Page 101 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 32, 42Air 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

Page 102 of 4087

LEXUS SC400 1991 Service Repair Manual Check voltage between terminals TP1 and SG of air conditioner control assembly connector. (1) Remove console upper panel.(See page BO-111). (2) Remove A/C control assembly with connec± tors still

Page 103 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 42Air Inlet Servomotor Circuit CIRCUIT DESCRIPTION The air inlet servomotor is controlled by the air conditioner control assem\ bly and moves the air inlet damper to the desired position.

Page 104 of 4087

LEXUS SC400 1991 Service Repair Manual Actuator check. Proceed to next circuit inspection shown on matrix chart (See page AC-36). Check air inlet servomotor. Remove cooling unit. Connect positive  lead to terminal 6 and negative  lead
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