Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 26 209nv i740001
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55-7
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
550XP-03
INSPECTION
1. INSPECT COOLER COMPRESSOR ASSY (MANUAL
AIR CONDITIONING)
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to the body ground.
(b) Check that the magnetic clutch is engaged.
If operation is not as specified, replace the magnet clutch assy.
I35416
2. INSPECT COOLING UNIT DAMPER SERVO
SUB-ASSY (MANUAL AIR CONDITIONING)
(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to ter-
FRS minal 5 and negative (-) lead to terminal 2, then
check that the arm turns to "FRS" side smoothly.
REC (2) Connect the positive (+) lead from the battery to ter-
minal 5 and negative (-) lead to terminal 1, then
check that the arm turns to "REC" side smoothly.
If operations are not as specified, replace the servomotor.
5 4 3 2 1
I35398
MAX.HOT 3. INSPECT AIRMIX DAMPER SERVO SUB- ASSY
(MANUAL AIR CONDITIONING)
(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to ter-
minal 4 and negative (-) lead to terminal 5, then
MAX.COOL
check that the arm turns to "COOL" side smoothly.
(2) Connect the positive (+) lead from the battery to ter-
minal 5 and negative (-) lead to terminal 4, then
check that the arm turns to "HOT" side smoothly.
If operations are not as specified, replace the servomotor.
5 4 3 2 1
I35389
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2933
55-8
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
4. INSPECT MODE DAMPER SERVO SUB- ASSY
(MANUAL AIR CONDITIONING)
(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to ter-
FACE minal 5 and negative (-) lead to terminal 5, then
check that the arm turns to "DEF" side smoothly.
(2) Connect the positive (+) lead from the battery to ter-
minal 5 and negative (-) lead to terminal 4, then
check that the arm turns to "FACE" side smoothly.
DEF If operations are not as specified, replace the servomotor.
5 4 3 2 1
I35388 I35986
5. INSPECT BLOWER RESISTOR (MANUAL AIR
CONDITIONING)
(a) Measure resistance between terminals, as shown in the
table.
Tester connection Specified condition
1-2 0.320 to 0.353
1-3 1.070 to 1.231
1-4 2.558 to 2.943
E32877 If resistance is not as specified, replace the blower resistor.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2934
55-9
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
6. INSPECT COOLER THERMISTOR NO.1 (MANUAL AIR
CONDITIONING)
- (a) Check the resistance between terminal 1 and 2 of cooler
+ thermistor No.1 as shown in the graph.
Standard:
5.3 to 5.4 k at 0_C (32_F)
2.6 to 2.7 k at 15_C (59_F)
E50650 E69013
40
30
Resistance (k) 20
10
8
6
4
2
0
-30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (_C)
I30145
If resistance value is not as specified, replace the sensor.
7. INSPECT BLOWER W/FAN MOTOR SUB- ASSY
1 2 (MANUAL AIR CONDITIONING)
(a) Connect the positive (+) lead from the battery to terminal
1 and negative (-) to terminal 2, then check that the motor
operates smoothly.
If operation is not as specified, replace the blower motor.
I31402
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2935
55-10
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
8. INSPECT MAGNET-CLUTCH RELAY (MANUAL AIR
CONDITIONING)
Standard:
Terminal No. Specified condition
No continuity
3 to 5 Less than 1
(When battery voltage is applied to terminals 1 and 2)
If continuity is not as specified, replace the heater relay.
E50315
9. INSPECT COOLING UNIT MOTOR SUB-ASSY W/FAN
1 2 (MANUAL AIR CONDITIONING)
(a) Connect the positive (+) lead from the battery to terminal
1 and negative (-) to terminal 2, then check that the motor
operates smoothly.
If operation is not as specified, replace the blower motor.
I44297
FACE 10. INSPECT AIR OUTLET SERVOMOTOR
(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to ter-
minal 4 and negative (-) lead to terminal 5, then
check that the arm turns to "FACE" side smoothly.
(2) Connect the positive (+) lead from the battery to ter-
minal 5 and negative (-) lead to terminal 4, then
check that the arm turns to "FOOT" side smoothly.
If operations are not as specified, replace the servomotor.
FOOT
5 4 3 2 1
I35408 I35987
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2936
55-1 1
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
11. INSPECT HEATER RADIATOR UNIT SUB-ASSY
(a) Inspect servomotor operation.
(1) Connect the positive (+) lead from the battery to ter-
COOL minal 5 and negative (-) lead to terminal 5, then
check that the arm turns to "HOT" side smoothly.
(2) Connect the positive (+) lead from the battery to ter-
minal 5 and negative (-) lead to terminal 4, then
HOT
check that the arm turns to "COOL" side smoothly.
If operations are not as specified, replace the servomotor.
5 4 3 2 1
I16706
I35408 I35988
12. INSPECT BLOWER RESISTOR TRANSISTOR ASSY
(MANUAL AIR CONDITIONING)
(a) Measure resistance between terminals 3 and 4.
Standard: 2.0 to 2.4 k
If resistance is not as specified, replace the blower resistor tran-
sistor assy.
(b) Inspect blower resistor transistor assy.
(1) Connect the positive (-) lead to terminal 4 through
E32877 a 12 V to 3.4 W test bulb and negative (-) lead to
terminal 2.
(2) Check the test bulb lights up when another positive
(+) lead is connected to terminal 2 through a 12 V
to 3.4 W test bulb.
If operation is not as specified, replace the blower resistor tran-
sistor assy.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2937
55-12
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
13. INSPECT COOLER (AMBIENT TEMP. SENSOR)
THERMISTOR (MANUAL AIR CONDITIONING)
(a) Check resistance between terminal 1 and 2 of cooler (am-
bient temp. sensor) thermistor as shown in the graph.
Standard:
1,615 to 1,785 at 25_C (77_F)
HINT:
As the temperature increases, the resistance decreases.
I30155
40
30
Resistance (k) 20
10
8
6
4
2
0
-30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (_C)
I30145
If resistance value is not as specified, replace the sensor.
14. INSPECT HEATER RELAY NO.1 (MANUAL AIR
CONDITIONING)
Terminal No. Specified condition
No continuity
3-5 Less than 1
(When battery voltage applied to terminals 1 and 2)
No continuity
3-4 Less than 1
(When battery voltage applied to terminals 1 and 2)
E32993
If continuity is not as specified, replace the heater relay No.1.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2938
55-13
HEATER & AIR CONDITIONER - AIR CONDITIONING SYSTEM
15. INSPECT REAR COOLER RELAY (MANUAL AIR
CONDITIONING)
Terminal No. Specified condition
No continuity
3-5 Less than 1
(When battery voltage applied to terminals 1 and 2)
No continuity
3-4 Less than 1
(When battery voltage applied to terminals 1 and 2)
E32993
If continuity is not as specified, replace the rear cooler relay.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2939
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