1991 LEXUS SC400 Service Repair Manual

Page 49 of 4087

LEXUS SC400 1991  Service Repair Manual 
OPERATION OF DAMPERS
AC±8±
AIR CONDITIONING SYSTEM Description 
WhereEverybodyKnowsYourName

Page 50 of 4087

LEXUS SC400 1991  Service Repair Manual 
CONTROL FUNCTIONS
Interior Room Temperature Control System
(a)  The desired temperature is set using the TEMP switch.
(b)  From the input signals (room temperature sensor, ambient temperature sensor,

Page 51 of 4087

LEXUS SC400 1991  Service Repair Manual 
Blower Fan Speed Control System
(When AUTO Switch is ON)
(a)  The desired temperature is set using the TEMP switch.
(b)  From the input signals (room temperature sensor, ambient temperature sensor an

Page 52 of 4087

LEXUS SC400 1991  Service Repair Manual 
Air Flow Mode Control System
(When the AUTO Switch is ON)
(a)  The desired temperature is set using the TEMP switch.
(b)  From the input signals (room temperature sensor, ambient temperature sensor a

Page 53 of 4087

LEXUS SC400 1991  Service Repair Manual 
Air Inlet Control System
(When the AUTO Switch is ON)
(a)  The desired temperature is set using the TEMP switch.
(b)  From the input signals (room temperature sensor, ambient temperature sensor and s

Page 54 of 4087

LEXUS SC400 1991  Service Repair Manual 
Part No.Part NameNote
07110-58011
(07117-58010)
(07117-78011)
(07117-88013)
(07117-88022)
(07117-88040)
07110-58040
07112-66040
07112-76060
07114-82020
07117-48050
Air Conditioner
Service Tool Set
(R

Page 55 of 4087

LEXUS SC400 1991  Service Repair Manual 
EQUIPMENT
 Part Name\
 \
Note
 

Voltmeter\
 


Page 56 of 4087

LEXUS SC400 1991  Service Repair Manual 
USE OF MANIFOLD GAUGE SET
INSTALLATION OF MANIFOLD GAUGE
SET
HINT: To prevent releasing refrigerant, use charging hoses
with a stop valve when installing the manifold gauge set to
service valves on t