Toyota 1994 CAMRY, Repair Manual

Page: 254 / 307

254
AIR CONDITIONING (LEVER CONTROL SW TYPE)
CURRENT ALWAYS FLOWS FROM THE HEATER FUSE TO TERMINAL 5 OF THE HEATER RELAY. WHEN THE IGNITION SW IS TURNED
ON, CURRENT FLOWS FROM GAUGE FUSE TO TERMINAL 2 OF THE AIR VENT MODE CONTROL SERVO MOTOR AND A/C MAGNETIC
CLUTCH RELAY (COIL SIDE)
→
TERMINAL 12 OF THE A/C AMPLIFIER, TERMINAL 1 OF THE A/C DUAL PRESSURE SW
→
TERMINAL 4
→
TERMINAL 2 OF THE A/C AMPLIFIER, HEATER RELAY (COIL SIDE)
→
TERMINAL 3 OF THE BLOWER SW.
1. OPERATION OF AIR VENT MODE CONTROL SERVO MOTOR
WHEN THE DAMPER IS IN FACE POSITION AND THE BI–LEVEL OF THE AIR VENT MODE CONTROL SW IS THEN TURNED ON,
CURRENT FLOWS FROM TERMINAL 7 OF THE AIR VENT MODE CONTROL SW
→
TERMINAL 5 OF THE AIR VENT MODE CONTROL
SERVO MOTOR SO THAT A SIGNAL THAT THE GROUND CIRCUIT IS ACTIVATED IS INPUT TO TERMINAL “B” OF THE CONTROL
CIRCUIT INSIDE THE AIR VENT MODE CONTROL SERVO MOTOR. SIMULTANEOUSLY, A SIGNAL THAT THE GROUND CIRCUIT IS NOT
ACTIVATED IS INPUT TO TERMINAL “A” OF THE CONTROL CIRCUIT INSIDE THE SERVO MOTOR. THESE TWO SIGNALS ACTIVATE
THE CONTROL CIRCUIT SO THAT CURRENT FROM THE GAUGE FUSE TO THE SERVO MOTOR, CAUSING THE SERVO MOTOR TO
OPERATE AND THE DAMPER TO MOVE TO BI–LEVEL POSITION. WHEN THE DAMPER REACHES BI–LEVEL POSITION. A GROUND
CUT SIGNAL IS INPUT TO TERMINAL “B” OF THE CONTROL CIRCUIT, THE CONTROL CIRCUIT OPERATES, THE SERVO MOTOR
STOPS ROTATING AND THE DAMPER STOPS AT BI–LEVEL.
WHEN ANOTHER MODE POSITION IS SWITCHED TO, INPUT OF SIGNALS TO TERMINAL “A” AND TERMINAL “B” OF THE CONTROL
CIRCUIT THAT GROUND IS NOT MADE (AS EXPLAINED ABOVE) ACTIVATES THE CONTROL CIRCUIT AND MOVES THE SERVO
MOTOR TO THE DESIRED POSITION.
2. AIR CONDITIONING OPERATION
WHEN THE BLOWER SW IS ON, CURRENT FLOWS THE GAUGE FUSE
→
HEATER RELAY (COIL SIDE)
→
TERMINAL 3 OF THE
BLOWER SW
→
TERMINAL 1
→
GROUND, ACTIVATING THE HEATER RELAY. THIS CAUSES CURRENT TO FLOW FROM THE HEATER
FUSE TO THE HEATER RELAY (POINT SIDE)
→
A/C FUSE
→
TERMINAL 2 OF THE A/C SW. IF THE A/C SW IS THEN TURNED ON AT
THIS TIME. A SIGNAL IS INPUT TO THE A/C AMPLIFIER. THIS ACTIVATES THE A/C AMPLIFER AND A/C MAGNETIC CLUTCH RELAY SO
THAT CURRENT FLOWS FROM THE GAUGE FUSE TO THE A/C MAGNETIC CLUTCH RELAY (POINT SIDE)
→
A/C MAGNETIC CLUTCH.
CAUSING THE COMPRESSOR TO OPERATE. THE VSV (FOR A/C IDLE–UP) IS TURNED ON SIMULTANEOUSLY TO PREVENT A
DECREASE IN ENGINE SPEED DUE TO A/C OPERATION.
HEATER RELAY
(4)5– (4)4 : CLOSED WITH THE IGNITION SW ON AND BLOWER SW ON
A/C MAGNETIC CLUTCH RELAY
(5)5– (5)3 : CLOSED WITH THE IGNITION SW ON AND BLOWER SW ON AND A/C SW ON
A 2
A/C DUAL PRESSURE SW
1–4 : OPEN WITH PRESSURE 2.1 KG/CM (30 PSI, 206 KPA) OR ABOVE 27 KG/CM (384 PSI, 2646 KPA)
B 5
BLOWER RESISTOR
6–1 : APPROX. 3.17
Ω
6–3 : APPROX. 1.38
Ω
2–6 : APPROX. 0.38
Ω
: PARTS LOCATION
CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE
A 2 28 (1MZ–FE), 30 (5S–FE) A17 32 H 8 33
A 3 28 (1MZ–FE), 30 (5S–FE) B 4 32 I 2 30 (5S–FE)
A10 32 B 5 32 J 1 33
A11 32 B 6 32
A12 32 C14 32
: RELAY BLOCKS
CODE SEE PAGE RELAY BLOCKS (RELAY BLOCK LOCATION)
4 25 R/B NO. 4 (RIGHT KICK PANEL)
5 26 R/B NO. 5 (ENGINE COMPARTMENT LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B
20 COWL WIRE AND J/B NO 1 (INSTRUMENT PANEL LEFT)
1D
20 COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
SYSTEM OUTLINE
SERVICE HINTS