1991 LEXUS SC400 Service Repair Manual

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Page 129 of 4087

LEXUS SC400 1991 Service Repair Manual Check voltage between terminal WV of A/C control assembly connec- tor body ground. (1) Remove console upper panel.(See page BO-111). (2) Remove A/C control assembly with connec± tors still connec

Page 130 of 4087

LEXUS SC400 1991 Service Repair Manual \ \  \  \ \ Temperature Control Switch Circuit CIRCUIT DESCRIPTION By turning the temp. c

Page 131 of 4087

LEXUS SC400 1991 Service Repair Manual Check voltage between terminal SET 1 ~ 5 and SG of A/C control assembly (1) Remove A/C control assembly with connec-tors.(See page AC-138). (2) Turn ignition switch ON. Measure voltage between t

Page 132 of 4087

LEXUS SC400 1991 Service Repair Manual Check temp. control switch. Disconnect temp. control switch connector. Measure resistance between terminals SET 1 ~ 5 and SG of temp. control switch is turned from most left to right position. for US

Page 133 of 4087

LEXUS SC400 1991 Service Repair Manual \ \  \  \ \ Automatic Control Switch Circuit CIRCUIT DESCRIPTION The SW contact is ON whi

Page 134 of 4087

LEXUS SC400 1991 Service Repair Manual Check voltage between terminal SAUTO and SG of A/C control assembly. (2) Remove A/C control assembly with connectorsstill connected. Proceed to next circuit inspection shown on matrix chart. ( See p

Page 135 of 4087

LEXUS SC400 1991 Service Repair Manual \ \  \  \ \ Diagnosis Circuit CIRCUIT DESCRIPTION This circuit sends signals to the A/C c

Page 136 of 4087

LEXUS SC400 1991 Service Repair Manual Check voltage between terminal Tc and E1 of TDCL. (2) Check voltage between terminals Tc and E1 of TDCL. Voltage: 10 ± 14 V (1) Turn ignition switch on. Proceed to next circuit inspection shown on
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