I03801
From back side
2
3
9
13
14
3
Connector ”A”
Connector ”B”
AC-134
-
AIR CONDITIONING
AIR CONDITIONING AMPLIFIER (Manual A/C)
1975
Author:
Date:
2001 SIENNA (RM787U)
(b)
Connect the connector to the amplifier and inspect the
wire harness side connector from the back side, as shown
in the chart.
Test conditions:
Running engine at idle speed
Front A/C and rear A/C blower switches at
”HI” position
Front A/C and rear A/C temperature control
dials at ”Max. COOL” position
A/C switch ON
Set manifold gauge set
Tester connection
Condition
Specified condition
A2
G
d
Constant
No voltage
A2 - Ground
Engine speed at idle - up speed
Below 0.7 V
Refrigerant pressure 196 - 3,140 kPa
Battery positive voltage
A3 - Ground
Refrigerant pressure less than
196 kPa or more than 3,140 kPa
No voltage
A9
G
d
Magnetic clutch is engaged
Below 1.0 V
A9 - Ground
Magnetic clutch is not engaged
No voltage
A13
G
d
Engine coolant temperature at
below 90
°
C (203
°
F)
Below 1.5 V
A13 - Ground
Engine coolant temperature at
above 90
°
C (203
°
F)
Battery positive voltage
A14
G
d
Magnetic clutch is engaged
Battery positive voltage
A14 - Ground
Magnetic clutch is not engaged
No voltage
Constant
Below 1.5 V
B3 - Ground
Turn rear temperature control
dial to ”WARM” position
Battery positive voltage
If the circuit is as specified, try to replace the amplifier with a new
one.
If the circuit is not as specified, inspect the circuits connected
to other parts.